XFX GTX260 power consumption

g3force

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But then again, the GTX 285 supposedly requires a 550 watt minimum power supply, but also requires 46A on the 12v rail. A bit of simple math equates that to 552 watts, so this magical card manages to feed itself power :lol:
 

andy5174

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What kind of efficiency is considered to be a good one? The efficiency of my CoolerMaster 550W is above 70%. Is it good enough? Or do I need to get a 80%+ one?

Thanks
 
Well by good I meant good Brand. For efficiency, 80+ for sure is preferable, however this has no effect on performance of the PSU (except for more heat). The rated power is the DC out, not the AC in. (500W @ 0.7 efficiency = 150W waste heat, 500W @ 85% = 75W waste heat)
 

andy5174

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I know that. However, the max output at 0.7 and 0.85 efficiency is 350W and 425W. Hence, I would like to ask if 550W@0.7 efficiency is good enough for GTX285 or not.
 
No, the 550W is after the efficiency loss. in other words, (at 70% efficiency) 650W comes into your PSU, 150W comes out as heat, and 500W goes into components as DC Power. The quality aspect is really asking, did the manufacturer do max continuous power or just max power, and can this PSU really output at that at all.

Regardless. To answer your question, you should be fine. I almost could run a 2900XT on a mediocre/poor 550W, so you should be fine.
 

pauldh

Illustrious

Seriously ... the 550W with 46A +12V is a greater requirement to list than than a 630W with 2 - PCIe power connectors. Some of the best 550W PSU's I know of have 41A +12V; can't think of any with 46A.
 

pauldh

Illustrious

It all depends on your system specs, how much +12V the PSU can deliver, and whether you plan to OC . There's a big difference between a stock e8400 and an OC'ed core i7. Add multiple drives, etc., your requirement could go way up. So how "loaded" a system make all the difference. Really can't answer your question without knowing:

What are your system specs?
What PSU are you talking about?
Will you OC?