| 1. You can pair normal atx PSUs for the motherboard/CPU and server PSUs for the GPUs using breakout boards. 2. You can power limit GPUs down to 250W and barely lose any performance depending on your use case, highly recommend it. So any PSU that can provide those is good. 3. HP 1200w power supplies are both plenty and cheap on ebay, even though they are rated at 1200w, because they are so cheap, you're better of just running them at ~500w and buy multiple of it instead of overheating a single one. A nice benefit of running them at lower wattages is the very loud tiny fan doesn't have to spin as hard and create a ton of noise. 4. Not needed, but having a single cable might be convenient, they are pretty expensive though. 5. You don't need to do anything special here, except if you add too many GPUs, the motherboard might have issues booting because the 75w per gpu draw is too much, but usually those motherboards will have an extra GPU power cable (like the ROMED8-2T) and some risers let you hook up the power cable directly to them so PCIe is only used for data transfer. 6. It's not the outlet, it's the circuit that matters. And keep in mind that whatever power wattage you set on the GPU, you need to account for ac/dc loss, so you need to add an additional ~10-15% to the usage. If you power limit it to 250W, each additional GPU is essentially an extra ~280W or so. If you plan on having like 8 GPUs or more and you plan to run them 24/7, you're better off just calling a local colocation center and run it there, since they have much cheaper electricity cost, it comes out cheaper for you and you have all the benefits of being in a datacenter. |