PSU for 6X R280X

[pagona]

i might be able to get free el. so i am not going for some platinum etc, something low cost and able to power 6GPUs, i will go with 2 PSU

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[Solidchance]

I'm about to build a 6x280x rig, I'm using a corsair 1200w gold and a thermaltake 1200w gold. Gonna undervolt the GPU's and am thinking total system around 1600ish Watts.

[Equate]

one 1200 watt and one 1000 watt

[igroock]

You do not need a 1200 and 1000, thats overkill. Full power draw of a 6x280x system is 1665watt. Get 2 decent PSU's to cover that much wattage with a little overhead.

[alumar]

You do not need a 1200 and 1000, thats overkill. Full power draw of a 6x280x system is 1665watt. Get 2 decent PSU's to cover that much wattage with a little overhead.

Math dictates that but onhand experience says depending on the card a pair of 1050's for the XFX, Visiontek's would work, but a 6x toxic R9 280x's hashing at 806 a piece were near 305w a card, thus requiring 1200w per each set of 3 ... and there was a bit of a stretch for the MB/CPU combo.

Yes you can get by with less but you are REQUIRED to undervolt and/or adjust powertune/core/mem clocks down from stock.

[clem84]

You do not need a 1200 and 1000, thats overkill. Full power draw of a 6x280x system is 1665watt. Get 2 decent PSU's to cover that much wattage with a little overhead.

I've been wondering about this overhead. Is it safe to run a PSU at full capacity 24/7 non stop for a really long time? How much leftover wattage (if any) do you need for a stable rig temperature wise? 100-200 watts? 10% of the watts?

[N[e]wBie]

I think 1200+1000 is a great setup for 6 280x:
assumptions:
 280x draws between 220w - 330 watts (under volted minimum and under clocked, 330 watts would be overclocked/volted with powered risers)
 These cards draw a lot of power, so platinum PSUs will pay for themselves very quickly, and operating any PSU to near maximum capacity 24/7 is not normal. High quality units will again pay for themselves helping with system stability and efficient power draw and distribution.
 
1200w : system + 3 280x  - averaging maybe 300 watts/card and at least 200 watts for the rest of the system, this should be a comfortable fit in any system.
1000w: Any three cards should fit comfortably, AFAIK 330 watts is the maximum draw of any card, and most cards probably are closing to 250-300 range even with a slight overclock.

  Most of the modifications to "rigs" are not what the hardware makers had in mind. PCIE riser cables, electric shorts to motherboards, fitting more than three GPUs on a board using powered risers, operating and overclocking units to their maximum capacity for long periods of time, and at hot temperatures.. so why try to do all of this with cheaply made components? Why run a PSU at 95-100% capacity instead of paying a little more for some headroom?
 I really have a hard time believing its worth it to try to "overclock" the amount of power a PSU can draw. Get high quality (platinum seasonic) units and a bit of headroom.

[pagona]

thanks for this  

[pagona]

is it possible to put 3 PSUs on rig, 2 GPUs on each power suply?