Custom Motherboards? 120
Druegan asks: "I've been rooting around on the net lately checking out all the latest and greatest in new PC parts, plotting out the design for my next build. I'm finding lots of neat stuff, but I can never seem to find a main board that has just the right combination of features. Therefore, I want to Ask Slashdot: Is there any way your esteemed readership knows as to how a person might get a main board custom made?"
"I don't know how practical this is, BUT I'm looking for a mainboard that supports a dual processor configuration for the AMD64 FX 55 processor, built around the nVidia nForce 4 chipset. I'd like two full x16 PCI-express slots with support for the nVidia SLI, as well as room for at least 2gb of dual channel DDR, and SATA Raid support. I also am looking to be able to overclock the bejeesus out of the whole mess.
This is only a test case, but there currently is no such mainboard available. I'd like to know if there is some way to get one custom built though, even if it is ridiculously expensive.. (yes, this might fall into the 'more-money-than-brains' dept.)
I'd just like to build the system to see how it'd work."
Doy (Score:5, Informative)
However, if you come up with requirements for a motherboard that are possible and you want to have one made, good luck. There are many companies that can do it for you for an extremely large pile of money.
Re:Doy (Score:3, Informative)
Re:Doy (Score:2, Informative)
Re:Doy (Score:2)
Re:Doy (Score:4, Informative)
Yeah, the 2xx opterons have the capability to setup a single coherent hypertransport link. You need coherent hypertransport links to get processors talking to each other without managling each other's memory.
Re:Doy (Score:2)
The Athlon used an external bridge chip that connected directly to each processor (the 760, as used on the Thunder K7 [tyan.com]).
The Opteron processors connect directly to each other, and one (or more) of them also connect to the rest of the computer. It's glueless, like in this board [lambcutlet.org]. Good thing, too, because one chip that connected to 4 or 8 processors would have so many pins on it that it would be incredibly expensive.
Re:Doy (Score:2)
>functionality that the FX physically lacks
As mentioned, it does have aditional functionality, but the FX and Opertons have a thermal spreader on them, so you cant even get to the top of the chip where you can complete these traces.
Even if you do, there is no gaurntee that it would work. Its better to just get the dual operton board.
Re:Doy (Score:4, Insightful)
Re:Doy (Score:2, Interesting)
Tyan offers a dual-Opeteron board with dual x16 PCI-Express slots. http://www.tyan.com/products/html/thunderk8we.html [tyan.com]
Re:Doy (Score:2, Funny)
Re:Doy (Score:2)
Re:Doy (Score:2)
That said, there were a number of 486-based SMP machines around pre-1995. The 486 wasn't SMP-capable, but the custom chipset used made such usage possible.
To the original poster, the cheapest way to have your own custom motherboard is probably to buyout Giga-Byte, or Asus or ECS, or something. :-)
Re:Doy (Score:2)
AFAIK nF4 doesn't handle dual processors or 32 PCIe lines.
If poster drops both (and he has to unless he wants to drop nF4 and move on to an Opteron based system), i'd recommand the DFI Lanparty nF4 SLI-DR
It's
Really hard... (Score:2)
Re:Really hard... (Score:2, Funny)
You just made my day! That's one of the funniest examples of "n00b miscalculation of complexity" I've seen in a while.
Re:Really hard... (Score:1)
I majored in computer engineering in college but we didn't take any EM fields classes. I would love to know this stuff today, but textbooks on the subject aren't easy recreational reads... Does anyone have recommendations for good books or web pages or courses that are good for those who are interest
Re:Really hard... (Score:2, Funny)
Sorry kids. This is only funny if you're over 30. Just humor me.
I don't think that will work (Score:4, Informative)
And the Nforce 4 isn't a dual CPU chipset. So you'll never find what you're looking for.
Re:I don't think that will work (Score:3, Informative)
Re:I don't think that will work (Score:3, Informative)
You can have two of them in your dual proc system (or 4 of them for that matter) and get your multi 16x.
Don't look for any manufacturer to produce such a thing, and frankly - doing a custom motherboard is probably out of your reach unless your first name is Bill and you don't mind throwing down a few million for a custom
Cool. (Score:3, Funny)
What's the production run? (Score:5, Informative)
My advice as an electronic engineer: give it up, your idea doesn't make sense.
What's the production run?-Realty-Check. (Score:1, Funny)
Now maybe people will realize what software people have to put up with.
Re:What's the production run? (Score:1, Funny)
Re:What's the production run? (Score:5, Informative)
1) A complete schematic capture system with a really good board layout tool. My company provides one for me, so I do not know how much they paid. But I would guess that for one license, you would have to spend $10K or so. Certainly more than $5K. Note that there are budget packages out there ($2K or so), but you get what you pay for.
2) You will need to get the board manufacturered. Expect at least $2K or so for a handfull of boards (probably closer to $5K). Since you will not get it right on the first try, you will have to get multiple revisions made.
3) Buy parts. Some items have a minimum buy quantity. You might need to get entire tape-n-reel packs.
4) Get the board built. This is not something that you can do yourself, unless you have $100K equipment lying around. Contract this out. My best guess is between $1000 and $5000 for small quantities. I am not sure about this part, though.
5) Debug. You do have test equipment, I hope. Minimum equipment will be a good logic analyzer and oscope. The minimum that I would recommend would be an Agilent frame with a good analyzer card, pattern generator card, and o-scope card (tektronics make awesome scopes, but I do not like their logic analyzers). Expect to drop at least $30K on this. You can rent, though, if money is tight
6) Let's assume that the hardware works. Did you want a BIOS with that? License it. I have absolutely no idea how much this costs. You will likely have to costomize the BIOS for your board. You might be able to do this with open-source tools. Expect to spend some time on this, though.
7) You want that done this year? While you hold down a day job? Expect to spend $10/day on no-doze and Jolt cola.
As you can see, there is a LOT involved. The only reason that you can get a motherboard for $100 or so is that they make a LOT of them. The first motherboard is incredibly expensive. The second one is dirt cheap.
What's the [cost of your] production run? (Score:1)
Translation: Production costs are way more than distribution costs, and "economics of scale" are important. Now if we could only get the "information wants to be free" crowd to read your post?
Re:What's the [cost of your] production run? (Score:2)
I hope you're not equating scale economics with scarcity.
Information has a development cost. So does a motherboard (as its schematic is information). Information does not have a marginal cost of production, as its existence in unit form is not tied to scarce resources (unless you consider a human brain a scarce resource). A mothe
Re:What's the production run? (Score:2)
The short version (Score:3, Insightful)
It's sort of ironic: most of us depend for our livelihoods on the fact that computers are cheap. Computers would not be cheap without economies of scale [wikipedia.org]. Yet few Slashdotters seem to grasp the concept. They're always complaining that nobody bothers to port their favorite game to Linux or Mac, or that off-the-she
I'm your man. (Score:3, Funny)
Re:I'm your man. (Score:1)
I believe that the Tyan .... (Score:4, Informative)
Wasn't there an article (Score:2)
I don't know if its possible in this case, but has anyone looked into modifying the FX to do the same thing?
Not a good idea (Score:5, Informative)
Aside from what others have already pointed out, namely that your chosen CPU and Chipset don't appear to support dual processors to begin with, the idea of having a custom motherboard made is silly.
Motherboards are extremely complex peices of equipment. An enormous amount of work goes into getting them production-quality, it's a lot more than just wiring the rights pins of the right chips and sockets together. There's all the EMF and heat effects to consider, trace lengths and their effect on signal propogation, etc. Then ocne you have a baord that's even capable of functioning reliably, you have to make a BIOS for it and get all the right parameters tweaked correctly to initialize the board the right way - there's a lot of values tuned by the vendor for the board in question that you never see in your little BIOS setup screen.
Even among commercial boards, as we've seen on review sites, there are varying levels of success at building a rock-solid stable board. It requires an enormous amount of engineering man-hours to go through the design and testing process, and sometimes they still can't get it quite right, and half the boards are a little "flaky" under the wrong conditions.
So even if you wanted to drop some enormous sums of money (very enormous, I would imagine, orders of magnitude more than the cost of any custom built PC), it would be unsupported by other vendors (drivers, etc), and likely be plagued by little one-off problems like so many new boards are. Usually the vendor can see the trends in the problems based on numerous end-user bug reports, and fix it in the BIOS - but with just one user, good luck.
Chances are that if you actually made a competent choice about what motherboard features and components really suit your needs, you'd find they already make it anyways.
Re:Not a good idea (Score:2)
Computer design is not an exact science. The current hardware and software development processes use the end user as a test fixture, and rely on the sheer quantity of end users to help fix bugs. A one-off bespoke solution is not an option.
Accept the things you can not change, This is one of them.
--Mike--
Re:Not a good idea (Score:4, Interesting)
That said... When I glanced at the headline, I assumed it was about somebody doing a custom 8 bit or 16 bit system, and was looking for some resources to make his tricked out Zilog box look more professional.
So, I'd love to hear from some experts about just what level of custom board would be doable for a hobbyist? How about a dual 8080, or maybe (joygasm) a dual 386 custom board? What free/cheap tools are available, and who does cheap low-volume PCB runs? Let's all pretend that a useful question was asked, and answer that!
Re:Not a good idea (Score:2)
Damn, where's my mod points when I need them? Parent: +1 Insightful
Re:Not a good idea (Score:5, Informative)
Depends on your definition of "hobbyist."
I'm an electrical engineer who also does hardware/software design & development both as a hobby and for pay as a side job. You can build pretty sophisticated hardware these days: it's never been easier.
I use the free version Eagle CAD to do PC boards under Linux, and there are plenty of shops that will build prototypes for under US$100. Most of the important parts manufacturers will either give you free samples, or sell small quantities off their website. My compiler of choice is gcc, also free.
My biggest problem is usually coming up with a cool project that's (a) worth doing, (b) doesn't cost an arm and a leg, and (c) can be done by one person who's married with a small child in less than a lifetime (i.e., 6 months or so
As a result, my most interesting projects tend to be from the people who pay me to design something they need, but have no idea how to do.: generally people with plenty of expertise in fields other than electrical and software engineering.
The stuff I come up with on my own tends to not get finished; OTOH, knowing someone's waiting on me to deliver (and is paying) is a huge motivator to get done on time.
HTH
Re:Not a good idea (Score:1)
Tyan Thunder K8WE (Score:5, Informative)
- Dual AMD Opteron(TM) 200 series processors
- DUAL PCIe x16 with FULL SPEED x16 lanes
- (8) DIMMs for Reg'd DDR400 memory
- U320 SCSI and SATA-II with NVRAID(TM)
- Dual Gigabit Ethernet with ActiveArmor(TM)
- FireWire and USB 2.0 ports
Re:Tyan Thunder K8WE (Score:2)
Can I put two dual-core Opterons on that and have it work to my advantage? I'm waiting for 64-bit Windows and more multi-threaded applications before replacing my recently upgraded AMD Athlon SMP machine.
Re:Tyan Thunder K8WE (Score:3, Insightful)
Try again. Those are dual PCI-Express x16 slots. You will notice 3 chips on the motherboard (well, you didn't since you obviously didn't go to the website where these claims are made in plain english - with a picture that shows the slots as well) - two chips are HT-PCI express chipsets, the 3rd is a HT-legacy chipset giving you an additional set of 2 PCI-X 100 and 1 PCI-X 133 slots
Thank you for playing - come again
Re:Tyan Thunder K8WE (Score:1)
Re:Tyan Thunder K8WE (Score:2)
Most I have ever owned was on an Abit board with 5 PCI, 1 ISA. I swear, PCI slots mean so much to users, yet 90% of the board out there have 4 max.
Re:Tyan Thunder K8WE (Score:2)
Not only that, but you need a big-ass motherboard.
The only ones I know of that have so many PCI slots are expensive rack-mounted "enterprise" systems.
Re:Tyan Thunder K8WE (Score:2)
I can (Score:5, Informative)
Then you need to pay a licence for a schematic-capture to PCB suite with simulation and auto-routing. I think a few 100K$ for the Cadence suite should do it. Oh, you thought that someone who thinks two-layer boards are a challenge and uses Eagle could do it? Nope.
You'll need someone to procure small quantities of the parts you want, that is, get to know all the reps in your area and squeeze them for samples. In between the badgering phone calls, you still have to order all the other parts, while trying to find a local PCB assembler to handle your parts. Don't forget to supply the pick-and-place file and keep in mind the constraints when building your parts library. Oh, you thought you can just buy parts and the software automatically draws them for you with the IBIS model already connected? Nope.
Advise the fab of your PCB ahead of time of the layer count and size of the PCB so they can at least get the materials and open up a time slot for you. When you start the layout, you should be able to estimate a completion time, so it's not a problem, right? You did think of the stack up BEFORE laying out, right? You didn't just use any thickness you felt like, right? You know the difference between pre-preg and core, right?
Anyways, once you've done all the placement, assigned all the properties to the nets (unless you did all that on the schematic and configured the packager to forward the properties to the board), set up the DRC rules and routing areas and keepouts, and defined your via technology, and routed the critical paths, you can unleash the auto-router.
While Specctra is churning away, you can go back to the BOM. Are all your parts going to ship at the same time? Will you receive them at the same time? Will you ship them to your assembler or will you want to look at them first? Anyways, you should be able to tell them when to open up a slot for assembly so they can schedule it.
After the auto-router is done, it's clean up time. Check the artwork carefully. Create the assembly drawings, mechanical drawings, drill files, pick-and-place and IPC files. You *will* want to electrically test the PCB before tossing it to your assembler, right?
So the layout is done, you can start sending gerbers to your fabricator for DFM checking, and you can send the pick and place and solder stencil files to the assembler. While the DFM checking is done, you can extract the layout into Signal Explorer and run some simulations to see if there are any signal integrity issues. What's that? You want to run those tests BEFORE actually getting the board built??
Well, it's already been a year since the project started, and no one can wait anymore....
Dude, what you're asking for is the single most ridiculous thing I've ever heard on /. Even more outlandish than the "can I use a laptop LCD on a desktop?"-type questions.
Re:I can (Score:2)
Re:I can (Score:1, Insightful)
Personally, I get the feeling that the submitter is a 15 year old spoiled rich kid.
Re:I can (Score:5, Informative)
-----
I agree completely.
I've been posting on Slashdot for around 7 years and I think this is my first "me too"-style post. Please forgive me. It's just that this question was so. fucking. ridiculous. Literally the stupidest thing I've ever seen posted on Slashdot.
Re:I can (Score:3, Insightful)
Re:I can (Score:5, Funny)
I'd like an Amiga laptop computer. Now that I just made this guy look totally sane, go get to work and build his totally sane motherboard for him...
Re:I can (Score:1)
You can do almost anything with enough money. Man went to the moon in 1969. The only reason that we don't do it today is that it is terribly expensive.
Re:I can (Score:2)
$100k up front, $500k by the end sounds about right.
Chewbacca (Score:2)
Re:I can (Score:1)
Buy some stock. (Score:3, Funny)
ridiculously expensive (Score:5, Insightful)
You're asking for quite a bit. A few people here have pointed out that FX 55 does not support a multi-cpu configuration (so you're already asking for a custom CPU/chipset), however, taking it a step further, the development process that goes into hardware development (especially for mainboards) is astounding. From reference chipset design (as well as testing and manufacture), to OEM's implementing that design (again, testing and manufacture). It's a big deal, and the process costs millions from end-to-end.
If you can afford this kind of solution, and are willing to take it on for personal use, I think that you're right that the discussion is quickly exceeding the more-money-than-brains department and entering the more-money-than-god department. Hell, if you can justify the cost of not only one, but two FX55's for a personal machine, you may already be in the more-money-than-brains department.
Check out the AMD roadmaps at Anandtech.com. You may just want to wait for the next FX chip release with dual cores, and an NF4 SLI nForce chipset. The dual core chip is as close as you'll get to true SMP, SLI will provide your 2 x16 PCI-e slots, the NF4 will provide support for dual-channel memory. These systems also come with SATA raid support, but IMO, an external controller is best (especially if you can find one with a battery backed cache). You'll have plenty of cash leftover for a badass liquid cooling system to overclock the crap out of that sucker. You will lose the exclusivity of having a super-custom system that nobody else can get, but hey -- it'll still be badass, and you will save $millions over custom hardware development.
As an alternative, if you're after exclusivity, you can start a hardware review website, gather a large readership, and then ask manufacturers for pre-releases of the latest greatest hardware for testing purposes. You'll get better-than-consumer support, and will have a machine that none of your friends will be able to buy for at least a few months.
dude (Score:5, Funny)
Re:dude (Score:1)
easy answer (Score:3, Funny)
Re:easy answer (Score:1)
Re:easy answer (Score:1)
Dear Slashdot (Score:5, Funny)
I'm looking for a videogame system that will play every game that's ever been made out there. I don't care how much it costs. I want it to be able to play every imaginable format, all through a single universal slot. Oh, and it can take any sort of controller ever made too. And while you're at it, make sure it can play every type of audio and video format (I'm planning on using it for my 1337 home theater setup). And don't forget to make sure that it'll be able to play everything that comes out in the future, too. I realize I may be asking a bit much, but I'm pretty sure it's doable...
Re:Dear Slashdot (Score:1)
Re:Dear Slashdot (Score:2)
Re:Dear Slashdot (Score:1)
Re:Dear Slashdot (Score:2)
Three easy steps (Score:2)
Step 2: ...
Step 3: Profit!
Re:Three easy steps (Score:2, Funny)
Step 1: Pay major mobo mfg about $1,000,000
Step 2: Wait a long time for it to be built
Step 3: Debt!
DIY (Score:1)
And this may not be a totally i
Re: (Score:2)
Re: (Score:2)
Re:has to? (Score:1)
And if webcrawlers harvest my email address posted here, do you think I want it to find my hotmail address, or do you think I want it to find my "real" email address? I think that using free email accounts in relation to posting in forums is a good idea.
If my hotmail account gets overburdened with spam, I abandon it for another one. I ain't gonna do that with my real address... Stuff that's actually important gets told about my
Re: (Score:2)
Get an 8 way iwill system instead (Score:2)
Why not just get Iwill's 8 way opteron system, load it with 8 dual core optersons, put in two nvidia 6800 pci-e cards in sli mode, and put in a terabyte in scsi raid 5 storage as well as a well one or two scsi raid 1 arrays for the system and scratch disks. You can do this and still come out about $10 million ahead of your custom motherboard with dual fx-55 support. Besides why use a dual cpu solution when you can have a 16 cpu monster ready to do your bidding.
Re:Get an 8 way iwill system instead (Score:2)
What in the hell. (Score:2, Insightful)
Re:What in the hell. (Score:2)
Gee, let's ask Slashdot! (Score:2, Troll)
from the we'll-publish-any-fucking-question-from-any-retar d -we-can-find dept.
Fucktard asks: "I've been rooting around on the net lately checking out all the latest and greatest in new PC parts, plotting out the design for my next "Ask Slashdot" post. I'm finding lots of neat stuff, but I'm a whiner and I want something twenty times more technically sophisticated than anything that has ever been made by mankind. Therefore, I want to Ask Slashdot: WTF n00b? W
easy answer (Score:1, Funny)
Cool, great idea (Score:2)
While anything is possible, i dont think you realize the costs/time involved. And if you have to ask here, i guarantee you dont have the funds or the expirence.
That is what PCI slots are for. (Score:2)
Insert PCI cards with features you do want.
Looks like cost is no object, so try the K8WE, a pair of Opteron 275s, Dual 6800 ultras, and 8 GB of ram.
That will give you a quad with dual video cards for 4 monitors or one monitor in SLI mode.
firewire? check.
dual gigabit ethernet? check.
Any raid across 4 sata II disks? check.
SCSI320? check.
PCI-X, PCI-Express? Check.
The absolute fastest workstation on the planet right now.
http://www.tyan.com/products/html/thunderk8we.h t
Motherboards ARE custom pieces (Score:2)
Apart from the obvious non-dual nature of Athlon FX55, you'll find motherboards that meet your demand.
I personally am looking for a simple nforce3 or nforce4 motherboard with large number of memory and pci slots. I mean more than 5 slots, if 10 slots are possible in that space, great, else a pci brige chip/riser card could be used.
And would be awe
For the price of a custom mainboard... (Score:3, Interesting)
So how about a less dumb motherboard question?
Q) I need as many PCI slots as possible, with at least a few being 64bit. 4-6 slots isn't nearly enough, I'm a guy that could fill 10+ easily. And a few (read:2-3) ISA slots would be nice also.
I'm not so picky on other things, but a wishlist in order of priority is as follows:
#(10+) PCI slots
dual cpus
64bit cpus
amd cpus
dual onboard gigabit
#(1-3) isa slots
dual onboard serial ports
I think that a passive backplane is the answer I'm looking for. Things like the Magma PCI expansion system (where 7 pci slots sit in their own rackmount case) aren't quite what I need. I understand enough about backplanes now, to know that I need a PICMG single board computer. Is it the right answer for what I want?
What price range are we talking, working up through modest configurations, up to the ones that meet all of my wishlist items?
Am I overlooking some other (presumably lesser known) options that would meet most of these needs?
Are there any pitfalls in installing and using linux on such a system?
While we're at it... (Score:2, Funny)
Go to Taiwan (Score:3, Informative)
It will cost millions and take 6 months to a year to get a good, stable system. Making a motherboard is far from the "just plug it in" stage, particularly when you get to new-ish technology (say, stuff released in the last 3 years). Everybody is still learning how to connect things up right and view the secrets of the development and testing as proprietary.
On the other hand, there is a big problem in what you're asking for- as far as I am aware, The chipset you specify doesn't support 2 x16 PCI-E slots, and opening it up to other chipsets, there are none that offer capability for 2 x16 slots (available now)
Re:Go to Taiwan (Score:2)
So add more:
From Game PC [gamepc.com]:
"Tyan's Thunder K8WE utilizes a combination of three individual chips onboard to allow for so much onboard connectivity, the nVidia nForce4 Pro 2200 primary chip, the nForce4 Pro 2050 secondary chip, and the AMD 8131 PCI-X controller hub.
The nForce4 Professional 2200 is the "primary" chip of the nForce4 chipset, as this chip supports
Re:Go to Taiwan (Score:2)
I'm a bit leery of nVidia's chipsets- I'm working with some people that have a couple of the Tyan dual
Re:Go to Taiwan (Score:2)
Re:Go to Taiwan (Score:2)
Re:Go to Taiwan (Score:2)
Re:Go to Taiwan (Score:2)
There are at least 3 boards that meet those reqs (Score:1)
http://www.tyan.com/products/html/thunderk8we.html [tyan.com]
(just preordered one myself),
The Iwill DK8EW and DK8ES
http://www.iwillusa.com/product_2.asp?p_id=91&sp=Y [iwillusa.com]
However, the Athlon-FX does not have enough coherent HT links for multiple cpus, so you will have to use the opteron 2xx series. As for dual 16x vs dual 8x, there is no real world performance diff.
Also, there are number of other mobo makers with similar boards on the way based on the nvidia 2200, 2050, and amd
what really kills me (Score:2)
Why go for the gold with a motherboard and limit it to 2gb ram and only sata raid? Lets get some real memory in it, at least 8 gb. And why not ultra scsi raid. Enough space so you can have a raid 5 setup.
I mean, if you are going to dream, dream big.
How about something more realistic/managable (Score:1)
Starting even at a basic level like some of the boards in mass produced systems, where the basic board might only have 2 PCI slots, but you can slap on an additional card to extend the PCI bus. Or add-in legacy devices, such as serial, printer or PS/2 port so they would need to be on the base board. Most of this could probably be accomplished with PCI-E x1. Perhaps, their needs to be new standard or new extension of ATX for thi
Here is how you do it. (Score:5, Insightful)
2. Contact Nvidia and have them make a custom nForce4 chipset that supports MP and 32+ channels of PCIe
3. Contact Asus and have them fab you the actual board.
4. Contact Award for the custom Bios you need.
5. Enjoy your custom MB and you claim to the title of King of the mods.
Total Cost... about 1 billion dollars. Okay maybe not but many million.
Good grief how did this make it on Slashdot?
Re:Here is how you do it. (Score:1)
What he's asking-after, is essentially an ABIT workstation-board, which seems to be not yet on sale in RL. . .
The INTERESTING Abit 'boards [abit.com.tw].
The Workstation subsection of Abit 'boards [abit.com.tw].
The Twin-Opteron Workstation 'board that many drool after [abit.com.tw]
Re:Here is how you do it. (Score:2)
He was very specific what he wanted.
" I'm looking for a mainboard that supports a dual processor configuration for the AMD64 FX 55 processor, "
Not Opteron but FX55s.
"This is only a test case, but there currently is no such mainboard available. I'd like to know if there is some way to get one custom built though, even if it is ridiculously expensive.. (yes, this might fall into the 'more-money-than-brains' dept.) "
I have to love this part. With out a doubt if
Start taking basic electronics classes ... (Score:3, Insightful)
In about 10 years you'll be able to create your perfect board, however, technology will have advanced so far underneath you that you won't be interested in such a board anymore.
Basically, for all the work involved, it's not worth it. Buy 2 computers and get a KVM switch; or share the resources on a network, etc.
But for heaven's sake, don't try to create your own desktop mobo - it's just not practical.