Originally Posted by orndorf77
I really don't think a 650 watt power supply would be enough . because if I was pulling 602 watts . 602 watts is about 95% of a 650 watt power supplies full capacity and there is no power supply that can run at 95% of its max capacity for extended periods of time . and not only that a power supply will deliver less power the longer you have it turned on . that's why they say the power requirements are higher then what they really are for example if a graphic card was to need 800 watts of power the manufacturer of that graphic card would recommend a 900 watt power supply . and in this case NVidia is recommending 850 watts which probably means I really only need 750 watts . I could of got away with using a 750 watt power supply but why would I want to push my power supply so hard for . I used extreme power supply calculator
602W is not what your computer would be pulling from the PSU in real-world situations , like gaming (and I did mean to say "from the PSU", not "from the wall outlet" - I edited my post just now). Again, it would be closer to about 550W. Therefore, a good 650W PSU would be the perfect fit. Or, if that's too uncomfortable for you (technically, it's extremely comfortable for a good 650W PSU), then go with a 750W PSU, but anything bigger than that is absolutely unnecessary extremely excessive overkill - and a waste of money. :(
Also, the the capacity of the kind of PSUs we are talking about is not the PSU's absolute max capacity. It is what the PSU can easily deliver 24/7 should it ever be required of it. That 5 or 7-year warranty you see on these PSUs covers that potential usage. The PSU is designed for it. It's not a cheap PSU. It's an enthusiast-class PSU:
The PSU requirements stated by both NVIDIA and AMD (and many professional review sites) are for peak-rated PSUs, not continuous-rated PSUs. We are discussing good continuous-rated PSUs in this thread, not cheap peak-rated PSUs. As a general rule of thumb, multiply the recommendation by .72 to find what the typical peak-rated PSU's +12V capacity is and this will tell you what good continuous-rated PSU you could use. For example, 850W. 850 times .72 is 612W. Divide that by 12 for +12V power, and you get 51, but 51A is not a common +12V capacity. However, 52A is, so multiply 50 by 12 and we get 624W, which is a VERY common +12V capacity for some decent (but not great) 650W PSUs. The kind of 650W PSUs I would be recommending have a +12V capacity of 648W - a full 36W above that estimation that came from the 850W recommendation. Again though, your total power consumption while gaming would peak at about 550W. Or, hey, maybe it would do an extreme peak of 575W, but I doubt it.
Now, after having said all that, I have one last thing I want to show you. I respectfully request that you use the PSU calculator again, but this time click its built-in Print button and post a screenshot of that white page that gets generated. I want to show you why it gave you such an extremely high calculation and I want to show you how to get the most reasonably-accurate calculation from it as taught to me by some of the finest PSU experts that OCN has ever seen. I want to prove to you that I'm not just blowing smoke here and that you really could power this very easily with a good 650W PSU. I will even use their "Pro" calculator for you, which I have a subscription for.
Please do this so that this can be resolved.
Edited by TwoCables - 1/7/14 at 7:32pm