I've gotten into *coin mining lately, and have started building a system to handle 6 GPU's. I had bought a single EVGA 1000 G2 PSU to run 3 AMD R9 280x cards, plus a dual core amd processor, and was bumping around 850-940 watts average. I have since bought 6 R9 290's, and am waiting on parts to build an open frame case for the rig. In the meantime, I've swapped the 3 280x's for 3 290's, but now I look at my kill-o-watt meter, and it's showing around 999-1020 watts. This is going to be dumb, as I already know that drawing more wattage than the PSU is rated for will shorten it's life, possibly cause shutdown/reboots, or burn up the PSU and/or the components in the computer.
Question is though, since I've ordered 2x 1300w psu's to power all 6, will running the three cards at possibly 2% more power than the PSU is rated for be ok for say, a week or so? I know EVGA is probably a lot better with their builds than some of the chinese brands, but I really don't want to shut down mining operations for a week while I wait on larger power supplies to come in.
Best Answer snaphat (Myles Landwehr) , 10 January 2014 - 06:54
The sustained load to your PC is less than what you see at the wall because PSUs are not 100% efficient. What this means is that if you are seeing 1020W pulled at the wall that you have a load of around ~816W on the PSU since it is 80 Plus rated. You would see around ~1250W at the wall if you were hitting 1000W loads. So based off of that you should be fine.
Note: I would take the exact numbers with a grain of salt because of variation on the efficiency, etc. But, the fact still stands that you should be somewhere around 150-200W away from the max load your PSU can output.Go to the full post