Next-Generation DDR5 RAM Will Double the Speed of DDR4 In 2018 (arstechnica.com) 77
An anonymous reader quotes a report from Ars Technica: You may have just upgraded your computer to use DDR4 recently or you may still be using DDR3, but in either case, nothing stays new forever. JEDEC, the organization in charge of defining new standards for computer memory, says that it will be demoing the next-generation DDR5 standard in June of this year and finalizing the standard sometime in 2018. DDR5 promises double the memory bandwidth and density of DDR4, and JEDEC says it will also be more power-efficient, though the organization didn't release any specific numbers or targets. Like DDR4 back when it was announced, it will still be several years before any of us have DDR5 RAM in our systems. That's partly because the memory controllers in processors and SoCs need to be updated to support DDR5, and these chips normally take two or three years to design from start to finish. DDR4 RAM was finalized in 2012, but it didn't begin to go mainstream until 2015 when consumer processors from Intel and others added support for it. DDR5 has no relation to GDDR5, a separate decade-old memory standard used for graphics cards and game consoles.
What a waste (Score:2)
You passed up a First Post for THIS??
Insensitive clod! I'm still using DDR2 (Score:1)
Insensitive clod! I'm still using DDR2
Re: Insensitive clod! I'm still using DDR2 (Score:2)
My FPM would like to talk to you both.
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What is this new-fangled Dynamic memory you speak of? I'm still using static me#@$@$^*
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What is this new-fangled Dynamic memory you speak of? I'm still using static me#@$@$^*
It's like Magnetic-Core memory, except it forgets... Segmentation fault (core dumped)
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Punch card. Abacus. Stones. :)
Double Data Rate (Score:2, Interesting)
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DDR means that it transfers data on two clock edges. Clocks only have two edges (up and down).
The number refers to other things about the protocol, such as voltage levels and allowable clock speeds.
Re:Double Data Rate (Score:4, Funny)
The number refers to other things about the protocol, such as voltage levels and allowable clock speeds.
So it's 5 volts at 5 Hertz. Got it.
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Is the acronym "DDR" really still applicable? I remember back when it came out thinking we were going to see QDR and ODR come out next and next. I guess the naming convention folks just got lazy and started tacking on revision numbers.
DDR means that it transfers data on two clock edges. Clocks only have two edges (up and down).
The number refers to other things about the protocol, such as voltage levels and allowable clock speeds.
Plus there is a QDR (quad data rate) type of RAM which reads and writes on every clock edge so 4 bits per line are transferred on every clock cycle.
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"DDR5 promises double the memory bandwidth"
What a stupid thing to whine about when it actually does double the data rate of the previous version.
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This is DDR Five. So I guess it should be FDR.
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Is the acronym "DDR" really still applicable? I remember back when it came out thinking we were going to see QDR and ODR come out next and next. I guess the naming convention folks just got lazy and started tacking on revision numbers.
Very good point. When we moved from SDR to DDR, the whole idea was using both rising and falling edges of a clock as triggers for different parts of the memory circuit to reduce read or write times
QDR or ODR might have made sense, but failing that, just call it SDR-2 for DDR, SDR-4, SDR-8, SDR-16 and so on
On a different note, what's w/ the new orange titlebar on /.? The teal one was just fine.
Latency? (Score:3)
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They can't change the latency, it hasn't changed in 15 years...
The speed of electrons isn't going to get any faster, the RAM is too far from the CPU to be faster than it is today in terms of latency...
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Re: Latency? (Score:1)
Cache?
Re:Latency? (Score:4, Interesting)
This is why I feel no great interest in upgrading to DDR4 (or DDR5). Once you have 64GB of RAM and are no longer touching the HDD for virtual memory, the speed changes between DDR3 and DDR5 for all but the most arcane applications is negligible, and video card is going to give you bigger bang for your buck in gaming/VR/AR/CAD/Video editing and the like.
(Geek note: yes, yes I know it is not universal, thus the generalization. You spend $600 on DDR5 Ram and I will spend $350 on a video card and we will see who comes out ahead.)
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Depends on how many library congresses worth of DVDs you need to move to China.
So, DDR5 will make DDR4...Faster?? (Score:3)
Nothing revealed, not news (Score:5, Interesting)
Article summary: "DDR5 is coming and it is going to be faster than DDR4"
That's it. No technical details at all. Will it be point to point? If not, how many ranks? What voltage? What sort of termination? Will there even be DIMMs?
You won't find answers to any of those questions in TFA or any page linked from the TFA. The only significant piece of information is confirmation that JEDEC has not given up on DDR.
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Article summary: "DDR5 is coming and it is going to be faster than DDR4"
That's it. No technical details at all. Will it be point to point? If not, how many ranks? What voltage? What sort of termination? Will there even be DIMMs?
You won't find answers to any of those questions in TFA or any page linked from the TFA. The only significant piece of information is confirmation that JEDEC has not given up on DDR.
Still, if it is true it is a good thing. Fast code needs to take advantage of the cpu cache, not be continually replacing it. A glance seems to show that L1 cache is around 100 times faster than DDR4 and around 50 times faster than L2 and maybe 25 as L3. Now if you install say 4 ddr5 modules, than might be 25, 13, and 7 times faster. I'm slightly suspicious about those numbers, but assuming that is right, well doubling the rate reduces the need for L3 cache. At some point it would become better to toss
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The main news (afaict) is that DDR5 will have double the bandwidth of DDR4. It's also going to have lower power requirements yet, and since the standard hasn't been finalized yet, grant you a pony.
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Article summary: "DDR5 is coming and it is going to be faster than DDR4"
That's it. No technical details at all. Will it be point to point? If not, how many ranks?
Well, it's one better, isn't it? It's not four. You see, most RAMs, you know, will be sticking at four. You're on four here, all the slots. Where can you go from there? Where?
Nowhere. What they do is, if they need that extra push over the cliff, you know what they do?
Put it up to five. One better.
Might double, but CAS latencies jump with it (Score:3)
Thus the actual increase in performance is very, very, very little.
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> Thus the actual increase in performance is very, very, very little.
Nope. CAS latencies are measured in clock cycles, so what you are seeing is the latency for the first read remaining at about 9ns. As the frequency increases the number of cycles it takes before 9ns has passed increases as well. Overall observable latency stays about the same for the first read, but you gain from the higher frequency on subsequent reads.
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You don't gain when you've got the RAM slots way away from the processor, though, like in quite a few of the larger ATX motherboards.
Really, the only true gain to be seen is having the RAM built onto the die itself.
Thats a neat trick. (Score:5, Funny)
>> DDR5 RAM will double the speed of DDR4 in 2018
Thats cool! Will my DDR4 go back to normal speed in 2019?
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Well, being English I think I can reasonably assume I'm a native English speaker. And no, correct grammar is not "inappropreate" (sic) for this site.
You don't need to wait! (Score:5, Funny)
> DDR5 RAM will double the speed of DDR4 in 2018
I heard you can set your system clock ahead to 2018 and your RAM will go double-speed today.
Oh (Score:5, Funny)
I heard you can set your system clock ahead to 2018 and your RAM will go double-speed today.
So THAT"S what overclocking means!
That sucks (Score:2)
More importantly than speed... (Score:2)
will DDR5 still be susceptible to Rowhammer [wikipedia.org] attacks? Also, will the increased speed make it even more susceptible? They barely escaped a cataclysm last time, so one would hope they addressed the root cause.
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will DDR5 still be susceptible to Rowhammer [wikipedia.org] attacks? Also, will the increased speed make it even more susceptible? They barely escaped a cataclysm last time, so one would hope they addressed the root cause.
The root cause of Row Hammer is physics: reading a row causes adjacent row capacitors to degrade at a faster rate than typical.
You can refresh the memory even more conservatively to eliminate these statistical outliers (reducing average performance and increasing power) or come up with a more nuanced approach (e.g., doing Targeted Row Refresh or TRR). In TRR mode the DRAM chip tracks row activations to identify a row that is being targetted and prepends the two adjacent rows to the Refresh sequence so they
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The root cause of Row Hammer is physics: reading a row causes adjacent row capacitors to degrade at a faster rate than typical.
Close but not quite. The root cause is reading a row causes adjacent row capacitors to degrade at a faster rate than they can be replenished. It is a result of physics and a lack of foresight.
One solution is to add a tiny amount of cache that will prevent higher than typical access rates from draining the adjacent row's capacitors but there are other solutions that would work just as well.
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Sweet, even more HBM! (Score:2)
That's Heaping Bullshit Marchitecture, for those not in the know.
Simply amazing (Score:2)
This is awesome technology... I mean, to double the speed of all the DDR4 memory already sold and installed in computers world-wide — without even touching them. Pure magic...