8x7990 Power Requirements
#2
Hello r0dn3y,

First, welcome to the forums. Currently I have one similar system running with 4x 7990.

I'm using 2x 1600 watt LEPA power supply's per machine. I noticed under full load on 1x 1600 watt the system became unstable / consuming too much on peak. Each 7990 has two power connectors so what I did was using a connector from supply 1 and one from supply 2. This way the power draw is shared over the two PSU's and the system is stable.

You should take a note that you need very good cooling to keep those dual gpu cards cool enough. I had to build a small cool-rig to keep this system cool enough to run 24/7. See: http://www.youtube.com/watch?v=HiWRt2aL9tg

I ordered another 4x 7990's for my second machine to VCL them together, will share the power consumptions once all is pieced together in the next couple of weeks. Currently this machine (depending on what tasks it runs) has the following consuptions:

Idle: ~ 350 watt @ 230V
Full load: ~ 1400-1700 watt @ 230V


Messages In This Thread
8x7990 Power Requirements - by r0dn3y - 08-20-2013, 05:33 PM
RE: 8x7990 Power Requirements - by gpufreak - 08-20-2013, 06:20 PM
RE: 8x7990 Power Requirements - by r0dn3y - 08-21-2013, 03:42 PM
RE: 8x7990 Power Requirements - by epixoip - 08-22-2013, 12:53 AM
RE: 8x7990 Power Requirements - by gpufreak - 08-21-2013, 06:35 PM
RE: 8x7990 Power Requirements - by r0dn3y - 08-21-2013, 07:05 PM
RE: 8x7990 Power Requirements - by KT819GM - 08-21-2013, 09:13 PM
RE: 8x7990 Power Requirements - by r0dn3y - 08-21-2013, 09:18 PM
RE: 8x7990 Power Requirements - by df1ech - 12-23-2013, 09:24 AM