Don't use cheap PSUs, and don't use dual PSUs on one system if you can possibly help it. Unless you're just making use of some high quality, lower wattage PSUs you had already, there is absolutely no reason to be using more than one PSU in a rig. I have never seen a pair of PSUs that cost less than a comparable wattage single PSU of the same quality and efficiency.
If you still insist on using dual PSUs, keep them electrically isolated from each other - a GPU and riser combo should only receive power from a single PSU, never split. Same for the motherboard. Use only powered, USB-connected risers -- never the ribbon cable ones. Failure to isolate can kill even the highest quality power supplies.
With a 7-GPU rig, you're making $35+ per day. Saving $50 by using a cheaper PSU is pointless if you end up having to RMA it or wait for a replacement.
I agree on most of the above - it shall be noted that my 750W PSUs are all EVGA 80+ GOLD so not supposed to be crap. Also these cost £90 each and an equivalent 1350 or 1500 cost closer to £300. So yes, I went for the cheaper solution, but definitely not for a low quality one. Just arguably a little too weak.If you still insist on using dual PSUs, keep them electrically isolated from each other - a GPU and riser combo should only receive power from a single PSU, never split. Same for the motherboard. Use only powered, USB-connected risers -- never the ribbon cable ones. Failure to isolate can kill even the highest quality power supplies.
With a 7-GPU rig, you're making $35+ per day. Saving $50 by using a cheaper PSU is pointless if you end up having to RMA it or wait for a replacement.
Not on carpet, no. Wooden frame on wood planks in the attic. They are all plugged into the same high quality belkin socket extender however.
