Originally Posted by AChubbySquirrel
Originally Posted by pioneerisloud
Your original $32 "880w" unit was actually closer to a mediocre 350w unit at best according to its specs (28a on the 12v PEAK....so 28a x 12v = 336w on the 12v rail....PEAK). In other words a Corsair CX430 would have actually been a better unit, as its about 380w on the 12v CONTINUOUS.
Honestly, there's no reason you need an 800+ watt unit. You could run SLI 580's off a good quality 650w, or a 750w if you plan to overclock. You could have gotten a great PSU for $50-60 at most that would have done the job just fine.
There's nothing "wrong" with the TX850, but I feel that the money could have been saved by going with something a little TINY bit cheaper that's just as good or better quality.
The minimum is 600W for one 580, so running two 580's off a 650W power supply probably isn't a good idea. (No better than that piece of crap PSU I just uninstalled i'll give you that) but I do plan on running SLI in the future.
Incorrect, a GTX 580 draws about 250w at MOST overclocked. There's no way you need an additional 350w for the rest of your system. In all honesty, 200w is MORE than enough for the rest of a typical system. So that's only about 450w that you ACTUALLY need available of good QUALITY power.
In other words, a GOOD QUALITY 500w unit is absolutely perfect for a single 580. Yes, you can run two in SLI off a 650w, I've done it.....had absolutely zero issues and my 12v rail NEVER dropped below 12.15v, even under heavy load. Once overclocked on everything though, the unit kept shutting off....meaning I needed more power (750w is perfect for 580 SLI).
Keep in mind, that in SLI you never get 100% utilization of both cards, so card #1 could be drawing 250w, card #2 could be drawing 200w.