I agree with one lad posted about power supplies, though I also disagree on something as well.
to answer question about PSU. If you think about it, 530+ watts I think is pushing it some, but, you do always want overhead. the cpu should draw no more then 200w even if overclocked, the GPU same 200watt even if overclocked, the rest of the system we will say 100watt, so all told, even when overclocked, 530watt would be a very high estimated power draw, though the Amps on the 12v rail should be well taken into account, between the cpu/gpu you would be around 38a at most from a 560ti and 1090/1100T
Power supply efficency, would 100% help temperatures, help keep clean power delivery, and most certainly provide more available power, but as far as save money, not really, I read a test not that long ago, for a platinum vs 75% efficent unti, to recoup the savings, it would take something like 8 years at high loads to see it pay off, I suppose a couple of cents savings is worthwhile, but you are usually paying alot more for silver-gold-platinum units then you would be for just an 80+ unit, so it truly doesnt "add up" so fast :)
But, always-always give some overhead, and go with a quality unit, and a UPS or power filtering unit can be a good idea as well. But generally a 750watt for single and some dual card gpu use is sufficent and gives overclocking and more headroom, if you went with dual gpu or more then an 850-1100watt would be better.
For GPU, GTX560Ti or GTX570, or Radeon 6950-6970, GTX560Ti EVGA-MSI-ASUS are all usually good choices, for Radeons, ASUS or XFX, I would go XFX 6950 2gb with dual fan and factory overclocked, they are excellent cards, overclock very well, and are very fast. Many of my buds own either a 560Ti or Radeon 6950 and they all say the same in regards to FPS and such, very very similar performance, a 560Ti would have to overclock very high to achieve 570 speeds, wheras a good 6950 can= to exceeed a 6970, which is almost identical performance to a GTX570
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