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Hardware Technology

Globalwin Jefi Watercooling Kit Reviewed 135

shockNZ writes "[H]ardOCP has reviewed what appears to be a first in PC watercooling - an 'open reservoir evaporative cooling system.' The Globalwin Jefi has a radically different design to most systems on the market. The reservoir is open at the top, and utilizes something akin to a showerhead in order to rain the incoming hot water from the PC down onto a floating heatsink. Perhaps surprisingly, it demonstrated excellent performance and low noise levels - and as a bonus, the reservoir can be used as an aquarium."
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Globalwin Jefi Watercooling Kit Reviewed

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  • by syrinje ( 781614 ) on Saturday July 17, 2004 @11:26AM (#9725066)
    Does the temperature of the water go high enuff to poach them??!
    • by WolfWithoutAClause ( 162946 ) on Saturday July 17, 2004 @11:35AM (#9725115) Homepage
      Well, given that the cooling depends to some degree on the processor load, which in turn depends on what you are running, it mainly depends how long you play your FPS for.

      Where: FPS = Fish Poaching Software; natch

    • Redundant?? OK mod, I forgive ya - This has to be a bug in the upgrade right?

      Seriously if the article say you can probably use it as an aquarium, its reasonable to be doubtfula bout that.

      And then there is this thing we have called "sarcasm" which you seem to have missed....aw heck - whatever.

    • Does the temperature of the water go high enuff to poach them??!

      Nope, but it's still probably not suitable for an aquarium. The manufacturer's test results report water temps up to 29.8 degrees celsius, or about 85 degrees fahrenheit, which is about 8-10 degrees too warm for most common freshwater tropical fish. Even their lowest reported temp is 77 degrees, which is at the top end of what you should consider safe for an aquarium.

      • by gbjbaanb ( 229885 ) on Saturday July 17, 2004 @01:56PM (#9725758)
        which is about 8-10 degrees too warm for most common freshwater tropical fish

        Are you saying I have to get a heatsink and fan to cool it down then?
        • Are you saying I have to get a heatsink and fan to cool it down then?

          If you intend to overpump your system, I recommend water cooling... ;)

        • You're laughing, but those of us with Marine (Salt Water) aquariums use such devices to keep our tanks cool in the summer.

          http://www.coolworksinc.com/iceprobe_aquarium_ch il ler.htm

          As far as the parent post is concerned, 85c is too hot for a marine tank as well. I personally use a pair of 60mm SilentX fans to help keep my fish and corals cool.

          http://www.nano-reef.com/forums/showthread.php?s =& threadid=32475&highlight=fan%2A

          • 85C?

            Have you ever touched anything that is 85C? I can guarantee that it wasn't for long...

            85F is probably a little warm for many fish, but probably survivable. 85C is suicidal even to CPUs...

            I wonder how hot the aquarium really would get. CPUS are running hot when they get above about 60C, but I imagine that water cooling would keep that down. If you got the water even as high as 35C it probably would become difficult to keep fish alive.
  • Er (Score:5, Informative)

    by Billobob ( 532161 ) <billobob@gmai[ ]om ['l.c' in gap]> on Saturday July 17, 2004 @11:26AM (#9725067) Homepage Journal
    Hasn't open reservoir evaporative been done many times before, also called a bong? Granted it probably hasn't been done exactly this way, people have been bong cooling for years - its just a little forgotten.
    • Re:Er (Score:5, Informative)

      by Billobob ( 532161 ) <billobob@gmai[ ]om ['l.c' in gap]> on Saturday July 17, 2004 @11:32AM (#9725101) Homepage Journal
      I know the above got modded as funny, but it really does exist - http://www.overclockers.com/articles389/ . Bong cooling hasn't been that popular in recent years however, seeing as people usually want a sexier way to watercool their PC.
      • 4 TEH LAZZY (Score:1, Informative)

        by Anonymous Coward
        clicky: Bong Cooling [overclockers.com] Dude, I'm stoned... So are you! *snicker* Bong is such a wierd word. Boong. Booooonggg. hehehe lol
    • Re:Er (Score:4, Interesting)

      by MikeLip ( 797771 ) on Saturday July 17, 2004 @11:35AM (#9725116)
      This type of cooling is used in power plants - particularly nuclear. That's what those cooling towers are doing. The coal fired plant in my local town uses towers as well. It's very efficient.
      • A similar "waterfall"-type system design is used for large "chiller" units for buildings - mainly large office buildings or apartments. Typically, they put the units on the top of the building, but sometimes they will be at ground level on smaller buildings.

        Basically, water is pumped and allowed to run over the heat-exchanger radiator, through which a "brine" is circulated (typically water with anti-freeze or similar to prevent corrosion and increase "wetness"). This brine is circulated through pipes and li

    • Re:Er (Score:2, Interesting)

      by denthijs ( 679358 )
      well yess, actually since ancient times :)
      but also in supercomputing.
      those cray supercomputer [online.fr] beauties had a big aquarium with something best described as indoor waterfall to cool the water back down
      • That's not H2O.... (Score:3, Informative)

        by DAldredge ( 2353 )
        That isn't H2O, it is Flurinert, and it is rather expensive.

        http://multimedia.mmm.com/mws/mediawebserver.dyn ?m mmmmmWUeyAmGQnm_QnmmmTIlYhOjxyX-
    • by Pfhor ( 40220 )
      What I am wondering about is if someone would throw a small condenser ontop of the bong, to reuse the water mist. I mean, you could just run it through a decent sized radiator block and get a collection of water at the other end, and have it go back into the bong system.

      Wow, creative uses for modifying a bong that has nothing to do with weed.
  • by Madcapjack ( 635982 ) on Saturday July 17, 2004 @11:29AM (#9725085)
    And if you overclock, you can make tea with it.
  • Case Mod? (Score:4, Funny)

    by mungeh ( 663492 ) on Saturday July 17, 2004 @11:29AM (#9725086) Homepage
    I'm sure I'm not alone when I say that a CPU cooling system that can double as an aquarium is something us serious modders have been waiting for. But how about a mouse pad ant farm? or a monitor that can be a hampster cage?
  • Failure Modes. (Score:3, Insightful)

    by DAldredge ( 2353 ) <SlashdotEmail@GMail.Com> on Saturday July 17, 2004 @11:31AM (#9725100) Journal
    What happens when this thing fails? Bye bye computer? I fail to see why people are so interested in liquid cooling or is it just the overclockers who use open loop liquid cooling like this?
    • by BrainInAJar ( 584756 ) on Saturday July 17, 2004 @11:39AM (#9725140)
      "What happens when this thing fails?"

      Same thing that happens when your air cooling fan fails... your processor catches fire (that was a sweet video...)
      • No, my motherboard shuts off the system to save the processor. It doesn't leak water over the CPU(s) and motherboard.

        One is just a LITTLE worse than the other.
      • Same thing that happens when your air cooling fan fails... your processor catches fire (that was a sweet video...)
        Funny, but still wrong. That video you're probably refering to showed what happened when the heatsink is removed, not the fan is failing. BIG difference.
        Doesn't mean that the cpu couldn't get damaged if the fan fails (and the system doesn't shut down), but it will take minutes to reach really high temperatures, and it certainly won't be such a spectacular death...
    • Fails how? If your pump or cooling fan fails, the heat goes up until, potentially, your computer shuts down (probably after sounding a nice alarm). If the waterblock comes off the CPU (unlikely with modern mounting methods), the CPU either fries, throttles down or shuts down. If it springs a leak, well, it's no worse than any other watercooling system; get something of quality and it'll be no more likely to do so than your freezer leaking coolent everywhere. If you knock it over and spill it, or crack t
  • Fishies (Score:5, Funny)

    by Anonymous Coward on Saturday July 17, 2004 @11:33AM (#9725106)
    Yes, I really want fish crap flowing through my PC.
    • This would really smell after a while. Nothing quite like fish debris warmed up. Especially if the curent state of your "cave" is anything like the average /.'er whom Mom has given up on (read: pigstye).

      I can see it now:
      • stack of pizza boxes (Domino's, not Sun's)
      • empty Bawls can pyrimid
      • laundry from the dot com bust draping furnature
      • overflowing trashcan with various rotting bits
      • smelly fish tank just to round out the place
  • Ooh.. lots of modding potential.

    Too bad performance isn't better for high output, this will dissuade hardcore OC'ers. I wonder if the design will take some root and advance a little, or fizzle out along with all the other weird gimmicks the PC cooling industry has seen over the years.

    There is definitely a market, with people expressing themselves through their PCs nearly as much as their choice in clothing and cars these days. The price will decide much of the Jefi's fate, ultimately.

  • by syrinje ( 781614 ) on Saturday July 17, 2004 @11:36AM (#9725123)
    The only novel idea in this whole thing is the open tank shower cooler - which also poses the spill hazard. Admittedly the tank looks like a futuristic acrylic ventilated crab and could be considered cool in some sub-cultures - BUT - if you have kids (yeah, some ./ers do!) or pets KEEP THIS system away from your PC. If you think you have problems with your dog drinking outta the toilet bowl now....
    • If you look at the picture in the flash "tour", yes, it does pose a spill hazard, but it's not like it's precariously leaning over the edge of the inside of your computer. I'm hoping that the picture isn't drawn to scale, but if it is, it looks pretty hard to topple over for a little kid (I'm assuming a bigger one could be taught why not to topple it over). On the other hand, you could also get a longer tube for the water, and put the tank on, say, an aquarium stand. I've really never heard of an aquariu
  • Silence (Score:5, Interesting)

    by bmiller949 ( 681252 ) * on Saturday July 17, 2004 @11:37AM (#9725124)
    It may be a bit too noisy for the silent enthusiast crowd. With the pump producing 22db and the fan doing 20db at the lowest voltage, it is not as silent as the Zalman Reserator. Then again, if you used the Zalman product on an AMD 64, the reservoir would double as a drip coffee maker.

  • Phishing (Score:3, Funny)

    by toetagger1 ( 795806 ) on Saturday July 17, 2004 @11:37AM (#9725125)
    That will give a whole new meaning when someone goes Phising on your computer!
  • by imsabbel ( 611519 ) on Saturday July 17, 2004 @11:40AM (#9725147)
    with open circuit watercooling system is water contamination. Algae seems to be able to grow on little more then the casual dust that enters the water, and the best place to grow is where you dont want it: The nice warm and thin parts of the CPU heatsink.

    • ...if I'm getting a watercooled PC, I want a standardized, closed-circuit system with properly distilled water. Too many ways to FUBAR compared to fan cooling otherwise.

      Then again, I don't think I'll ever get a system "extreme" enough to require water cooling. If I do, I'll rather put it as far away as I can in a closet/wind tunnel for cooling.

      Kjella
      • THe nice thing with watercooling is that you can have a performance system, VERY silent, if you are creative. Those systems with in-tower-radiators (even g5) suck. If the heat is already in the water, why cool the water with hot air from inside your case, or blow the heated ait inside (depending on airflow direction)

        The inside of the case is normaly suffed enough.
        I have a nice big external radiator, which is able to cool my pc sufficiently even in the summer (without AC) without any fan on it at all.

        Becau
    • Bigger conceptual problem with an open system - the water in that reservoir will evaporate. It's a bitch to cool something when your tank is empty.

      There shouldn't have to be any upkeek on a cooling system.
    • Even worse is when the algae combines forces with your computer innards, thereby creating a living supercomputer hellbent on taking over the world!

      Man, what am I on today...
    • Could you fill it with a light oil instead? Should beat back the lower life forms and evaporation to boot.
      • The problem with that approach is that oil isn't nearly as efficient at wicking away heat from the processor, nor able to cool down as easily as water. It's a fantastic lubricant, which is why it is in your car's engine, but notice it doesn't live in the radiator for precisely these reasons.
  • Great . Flash.. (Score:1, Offtopic)

    by nurb432 ( 527695 )
    Blah.. cant people just use standard html?
  • by Anonymous Coward on Saturday July 17, 2004 @11:42AM (#9725152)
    Up to now there's been no affective way for home aquariums to host the exotic creatures found near deep-sea volcanic vents - until now!

    (Sulfur not included)
  • And does algae drastically reduce cooling performance?
  • why not use? (Score:2, Insightful)

    Why did they not use pressure water like system?

    It would have been able to handle the heat of overclocking and woudl not need much changes..

    they system they had is what predated the pressued coolant/water radaiators incars..

    instead of using un environment friendly glycol you could use a freon subsititue..

    • Re:why not use? (Score:3, Interesting)

      by drinkypoo ( 153816 )
      Because it takes dramatically more energy to run a compressor than it does to run a gentle little pump and a couple of fans, probably. Besides, there are $500 products which have an air conditioning system in them, probably running R134A. Or, you could just adapt a window A/C unit or something.
    • Oh dear.

      Pressurised cooling systems are for heat engines running at a high temperature which would quickly evaporate an open water system. The whole idea is to keep the processor down in the 30s C. And freons aren't too good - they lack the thermal capacity and the transfer efficiency of ordinary water which just happens to be a superb liquid cooling medium.

  • by scrytch ( 9198 ) <chuck@myrealbox.com> on Saturday July 17, 2004 @11:50AM (#9725198)
    .. for "cases and cooling". God knows I'm sick to death of seeing Yet Another Case Mod and Yet Another Cooling System.

  • Aquarium? (Score:3, Insightful)

    by Shoten ( 260439 ) on Saturday July 17, 2004 @11:56AM (#9725225)
    I don't think this guy has ever really owned an aquarium. There's no way you could have it do double-duty like that, and I can sum up the problem in one word: algae.
  • by alex_ware ( 783764 ) <alex DOT ware AT gmail DOT com> on Saturday July 17, 2004 @12:03PM (#9725246) Homepage
    1. install Jefi
    2. fill with ice like reccomended
    3. watch the pc overheat and burn out

    --Oh your 'sposed to put ice AND water in it--
    (seriously though just filling with ice wont help as it might be cooler and might cyrogenically freeze your fish but you cant get ice cubes down the pipe and your pc might overheat in the time it takes for enough melting)
  • People are saying that algae would screw up this system.

    My first reaction was to add something to the water to kill the algae - like alcohol - but the alcohol would be added expense and likely evaporate off more readily (and therefore more costly).
    And then that wouldn't go well with fish.

    But what if you setup a closed system so that the intake is in the fluid pool - same way it is now. And then instead of an open air system, you just put a top on it (ideally a cooled top, but room temp would likely be eno
    • 1: water is cheaper than alcohol
      • If you are buying 1 gallon of water, and 1 gallon of alcohol, then yes the water is usually cheaper by volume than alcohol (technically this depends where in the world you are).

        But with an open system, you have contamination and evaporation, meaning that you have N gallons of water that you are supplying, where N increases steadily over time.

        In a closed system with alcohol (or anything else - even a closed system of water - but that wouldn't evaporate as readily) you would not be introducing contaminates
        • ok 1 gallon of water from the tap a fraction of a cent/penny a gallon of alcohol several $/£ how bad would evaporation need to be to counter the cost
          • Again, depends on where you live as to what the cost of water is.

            If you were solely having to account for evaporation, then it would depend on the room environment in which it was located. The temperature and the humidity levels and also if A/C was running or not.
            But if you live in the US, and you are in a 72F room with no A/C, then the evaporation costs are going to be low indeed.

            Water also has the nasty habit of allowing things to grow in it, which was already stated in other posts. You can certainly ad
            • i dont live the US I live in england where today it is between 20 and 13 degrees centigrade If I left some water in the sun nothing would happen but being in not that hot whether means that water cooling is pointless
    • you haven't thought about it at all
      test the idea:
      1: take frying pan
      2: start hob (low heat 70degrees C)
      3: put frying pan on hob
      3.5: keep fire extinguisher near
      3.5.5: keep away from the pan
      4: pour alcohol of choice onto pan i.e. Vodka
      5: Oh look a big fire turn of gas and extinguish

      now what has that tought you:
    • Well, in closed system you can definitely use something better than water.

      Water is not the best coolant ever. I beleive it is possible to find some other chemical agent which will have higher heat capacity and heat conductivity. Improving this two properties will improve cooling for sure.

      Another option - obviously - make water flow faster. But this can introduce noise and make system more expensive (given you will try to keep the same noise level).

      For even more expensive option one can use trick used in
      • I beleive it is possible to find some other chemical agent which will have higher heat capacity

        That would be a neat trick. I've never heard of anything that would qualify. Can you also find me something that is less dense as a solid than as a liquid? H20 is actually pretty cool.
        • I've forgotten - and actually never knew this things very good. They usually go out of scope of school chemistry courses.

          I remember that my god-father was using some derivative of spirit to improve quality of his home heating system. Bit his system was open one.

          Another important property - as you have absulutely correctly pointed out - is density. So it seems that we are left only with open systems, since CPUs usually run with relatively low temperatures. (Trick with lithium is simple - it runs with very-
          • Car engines use oil to lubricate (and cool too I guess, never thought too much about that) the moving parts.

            But the radiator is a water based system that then flows through the walls of the engine block and around the cylinders (where the explosions and therefore highest heat are).

            In cold climates they put other materials into the water so that it doesn't freeze when the car isn't running - and I thought I had read that they also increased their ability to deal with the heat - but perhaps that was just ad
            • oil lubricates and cools moving parts (crankshaft , camshaft, valves, piston rods). The engine block is cooled by water with some other substance to prevent rust (in iron blocks) and to raise the boiling point and reducing freezing point. some manufacteres droped water all togheter. some of the substances used are ethylene glycol or propylene glycol. use of pure water as coolant in a car engine is not recomended and voids the warranty of many models.

              take care if using ethylene glycol because it's toxic. in
    • The effiency of the original system comes from the fact that the escaping water carries its heat of vaporization with it. If you instead condense the liquid you need a way to dissipate the heat, which will either require a large surface area or active cooling, i.e. a fan.

      If algae were the only concern the system could easily be built with opaque materials in a manner which reduced light entering the water.

      • I should have been more clear on the "closed" system concept.

        There would still be a tank - just instead of being open to air (and pets) it would have a sealed lid on it.

        That way you have liquid at the bottom, getting pumped over the chips, then dumped out into the tank and heat sink and would vaporize onto the larger surface area of the tank top (assuming you count the walls - and larger in that it has more surface area than just the surface of the pooled fluid below since it only has that top surface to
    • alcohol ... wouldn't go well with fish.

      I would recommend white wine and moderate overclocking for about 45 mins. Should be delicious.

    • i used to run a 10 gallon tub behind my machine...was too cheap to buy a radiator...I just added a little (2-3 capfulls) bleach to it to keep anything from growing...it was a sealed tub in my dorm room, but with 10 gallons of water and a 250gph pump it kept my Duron 800 happy at 1050 and I even had blocks on my GeForce256 and my northbridge...made them out of copper plate and 1/2" acrylic sheet with patterns routed out...
  • Mineral buildup? (Score:3, Interesting)

    by TrumpetPower! ( 190615 ) <ben@trumpetpower.com> on Saturday July 17, 2004 @12:13PM (#9725285) Homepage

    The tap water here in Tempe, Arizona, is quite hard. If you don't dry the dishes, you'll get lots of spots on them. (Never bothers me, but some....)

    Combine that with the very low humidity here and this kind of evaporative system and it wouldn't be long before, instead of tubing, you had solid bars of mineral salts covered in rubber.

    Of course, you could buy de-ionized water, but, for me at least, that'd get old pretty quick.

    Cheers,

    b&

  • by tlay ( 793463 )
    I wanted to do something like this about a year ago, but I was concerned that the temperature would sear the fish so I just ended up getting this:

    http://www.thinkgeek.com/pcmods/cases/6151/

    It's worked out pretty well. One of the fish lost an eyeball, but otherwise I've had satisfactory performance. You can't tell very well from their demo picture but the tails move and they do look fairly realistic. Some folks have actually thought they were real! And better yet, I don't have to worry about rolly pole
  • Cray 2 (Score:2, Interesting)

    by MuMart ( 537836 )
    The heat exchanger in the Cray 2 supercomputer used this same technique. Heat was transferred from the fluorocarbon in which the cpu circuits were immersed into an open-air water sytem.

    It even came with it's own glass waterfall thingy to keep the board happy.

  • by Animats ( 122034 ) on Saturday July 17, 2004 @12:23PM (#9725325) Homepage
    If you want liquid cooling that isn't a joke, get a Shuttle PC. [shuttle.com] They've been shipping little breadbox sized machines with heat-pipe cooling for years. We use these in places without air conditioning, and they work fine. We've had five units for a year, and none have ever failed.

    No neon, no overclocking, no extra slots you don't need. Just little machines the work.

  • Such a good idea? (Score:3, Insightful)

    by Jubii ( 315611 ) on Saturday July 17, 2004 @12:24PM (#9725329) Homepage
    Is it just me, or does anyone else out there think that an open container of water on your PC is a bad idea? I generally work with a cup of coffee or glass of Coke next to the keyboard, but that's a little different than having a fishbowl's worth of water sitting on top of my PC. Of course, I have really clumsy friends too...
    • you could place the cooling tank anywhere, just need extra lengths of tubing.

      really what this is is very similar to the way chilled water air conditioning systems work in large office buildings, or building campuses. They have very large cooling towers that 'rain' water down, cooling it. This is then pumped out to individual building a/c units. Though expensive to install, its very energy efficient.

  • by secondsun ( 195377 ) <secondsun@gmail.com> on Saturday July 17, 2004 @12:25PM (#9725330) Journal
    I can imagine being woken up at 2 AM for an emergency outage because someone forgot to water the server.
  • by SunPin ( 596554 )
    The Jefi in full aquarium mode would be a great way to introduce your wife or girlfriend to the world of water cooling.

    This marketing meme rivals the stupid ones posted on slashdot.

  • been done before (Score:3, Insightful)

    by slugo3 ( 31204 ) on Saturday July 17, 2004 @12:59PM (#9725480)
    shockNZ writes "[H]ardOCP has reviewed what appears to be a first in PC watercooling - an 'open reservoir evaporative cooling system.

    Its been done before.

    Fish Tank Water Cooler [water-cooling.com]

    It's nice that this comes in a kit but it's usually cheaper to build it yourself. I didn't see the price of the kit in the article but I bet you could do a lot better than that cheesy looking fish tank for less money. I guess the radiator thingy sets this apart from the project that I linked to but I don't understand how agitating the water helps disperse heat. It seems like you would be better off with more coolant and a powerful pump.
    • Re:been done before (Score:3, Informative)

      by cephyn ( 461066 )
      agitating the water will cause ripples. ripples increase surface area, just like the "ripples" on a heatsink, allowing more heat to transfer.
  • not truly silent (Score:3, Interesting)

    by 0111 1110 ( 518466 ) on Saturday July 17, 2004 @01:29PM (#9725629)
    To a silent pc purist, water pumps are BAD. I am more interested in a geo-thermal (ground-based) system, or truly passive, convective water cooling, or maybe some kind of passive water cooling that plugs directly into cold water pipes so that it works as a kind of pre-heater so that the water heater in the house doesn't need to do as much work.

    This is a cool idea though, if you can manage do find or build a quiet enough pump.
  • This would go perfectly with the Aquarium case mod [nobispro.com] reported here on slashdot a while ago. Then it's all in one box!
  • For anyone who may have a water bed (me included) i have considered using it as a cooler. My initial thought was to do something similar to what is done in this water cooler except closed and relying on the surface area of the bed to put off the heat (also will keep bed alightly warm in winter... no more need for a heater) the only problem i could think of is if someone jumpped on and the presure popped something in my computer (that would suck)

    recently someone suggested running tubes under the bed(touchi
  • Skanky Water (Score:3, Informative)

    by Craig Maloney ( 1104 ) * on Saturday July 17, 2004 @08:12PM (#9727740) Homepage
    Ummm... unless you're changing the water in this thing constantly, that water is going to get really skanky really quickly. Plus, if you put ordinary tap water in there, it'll have deposits and whatnot that you probably don't want to be piping around your computer. Ugh! And heven help you if you put that reservoir near sunlight.
  • as a bonus, the reservoir can be used as an aquarium.

    Just what I needed, fish shit circulating over my Athlon. No thanks.

  • an 'open reservoir evaporative cooling system.'

    I saw no mention of how mcuh water evaporates from this thing in a day, but my gut feel says it's gonna be a bunch (>1gal/day). Anyone know any exact evaporation figures?

  • ...

    Windows: remember to top off the computer daily, say, with every OS patch.

    Linux: um.. er.. well,, just remember to top off the thing daily, OK?

"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_

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