24 ms·

You may want to look at hybrid/liquid cooling with an X99 motherboard e.g. 4 cards x 16 PCI-e lanes http://www.newegg.com/Product/Product.aspx?Item=N82E16813132

• dogma1138 10y ago
  The problem is then you are spending about 2000$ on your "chassis"(case, cpu, motherboard, memory, cooling etc.) if you are in that situation then getting the more expensive cards (1080/1080ti or even the Titan w/e they'll name it now) is usually the only way to go because your chassis is now a major factor of the final price so you'll need to squeeze a much performance from it as possible.
  • semi-extrinsic 10y ago
    Yes, I can confirm this is the case (pun intended). I've been speccing out GPU machines for molecular simulation, and any way you slice it, the actual GPUs account for less than 50% of your total cost, as long as you're looking at GTX class cards. The other issue with 8 GPU machines, which tend to use dual CPU motherboards to have enough PCIe lanes, is that you pay a serious performance penalty for communication between GPUs attached to different CPUs (over QPI). It's so bad that I've seen several standalone 8 GPU systems using FDR Infiniband (with GPUdirect RDMA) to communicate internally on the machine. Which is of course bloody expensive. If it suits your workload, having two separate 4 GPU machines is better and cheaper than a single 8 GPU machine.
• fredophile 10y ago
  Can you actually get full performance out of that? I thought the bottleneck these days is the CPU which maxes out at 40 lanes at the high end. This only gets you 1x16 and 3x8 even if all the slots support 16 lanes.