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Specifically, I'm looking for GPU cards that take up 2 slots, so spacing is an issue.

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closed as off topic by slhck, RedGrittyBrick, Ƭᴇcʜιᴇ007, Sathya Apr 15 '12 at 2:24

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If spacing is an issue, you can always get a PCB printed to "extend" out the PCIe pins to stagger/offset each card (assuming the heatsink isn't blocking the port). – Breakthrough Apr 14 '12 at 16:32
I forgot to mention... cost effective is a key consideration so whatever I can get out of the box is better – Shamoon Apr 14 '12 at 16:34
up vote 3 down vote accepted

There is the ASUS P6T6 WS Revolution.

6 PCI-E Gen2 x16 IO onboard
True @16 3-Way SLI
True 16+2 Power Phase Design

enter image description here

Er, you say cost-effective being the consideration? Cost tracking is a different ball-game with 6 GPU cards on your system...
This is not a new board -- here is a 3 year old review,

If you're the type of power user that must have 3-Way SLI or even perhaps just have three graphics cards in your system, you don't currently need three full X16 Gen2 PCI Express-enabled slots to get top performance from a tri-GPU setup. As we demonstrated in our high-end gaming benchmarks, you definitely would be short-changing yourself with anything less than a X16 and a pair of X8-capable slots but essentially the added cost of NVIDIA's NF200 chip won't buy you any additional gaming performance, at least currently.

And that is March 2009

More recently, Asus Rampage III Extreme,

4 x PCIe 2.0 x16 (dual x16 or x16, x8, x8 or quad x8)

Update from your comments:

  1. A dual slot card will take up two slots (by definition), but do look at its capabilities (GeForce GTX 680)
  2. Looking at your plans with the hardware, I'd still suggest going for an ready-built server-class machine; and before you give up on the price figures, think about the secondary processing you'll need to do on such a hand-built machine (think heat and power again).
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But how can I physically place 4 GPU's (or 6) in there? The slots are too close together – Shamoon Apr 14 '12 at 17:04
The boards are designed with the intent of dual and tri GPU configurations. The cards will fit in. Your problem will start with cooling and power. – nik Apr 14 '12 at 17:12
btw: why not look at ready-built solutions based on say, Nvidia Tesla M2090 devices (HP has some Xeon servers with these installed) -- you will solve the casing problem (pricing is close to $2000 tho). – nik Apr 14 '12 at 17:13
Just looking at it, I can tell that a dual slot card will take up the space of 2 slots. That means, I can put in 3 cards at most, no? – Shamoon Apr 14 '12 at 17:15
Well. I need the Radeon 7970 since I'm using it for Bitcoin mining, not gameplay. Nvidia typically doesn't mine as well as ATI ( So I can't pop 6 cards into this motherboard is what you're saying? – Shamoon Apr 14 '12 at 20:43

Last time I looked, I was only able to find motherboards that would support 4 GPUs, but depending on your needs (2D vs 3D), you can drive 12-16 monitors off 3-4 cards.

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I don't need GPU's for monitors. I need them for processing capabilities. Can you tell me which motherboards will support at least 4 GPU's? – Shamoon Apr 14 '12 at 16:47
NewEgg will let you search by PCI Express slots. Something like might serve your needs. – Andrew Coleson May 5 '12 at 20:00

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