Unfortunately, I'm kind of useless when it comes to the power consumption of overvolted cards. At that point, I just kinda shrug my shoulders and add maybe 100-150W just because I don't know.
Originally Posted by Mercyflush64
In my current setup I am wondering if my 750w PSU is just too much and I could get by with a hardly used Corsair 520w HX from back when they were the top of the market several years ago. My video card recommends a 400w PSU and draws 20 amps/110w of power.Everything else in my rig will be the same except for a replacement m/b next week. Two of my 1tb hard drives are actually in a powered external case so very little power draw from them. only phter peripheral is an xbox controller and the occasionally plugged in ipod.
The HX650 wasn't the top of the market, it was just a pretty good PSU.
Anyway, the 400W recommendation is for peak-rated 400W PSUs. The typical 400W peak-rated PSU would have a +12V capacity of only 288W, or 24A. Therefore, even SeaSonic's 360W G Series would be plenty for your rig. The HX520's +12V capacity is 480W (40A).
Check this out:
With one GTX 650 Ti under full load in their system, their PSU pulled 219W from the wall outlet. Their CPU was idling, so I have to add about 125W for the 2500K at 4.4 GHz. So, 219+125 is 344W, meaning that if the 650 Ti and the 2500K were both under full load at the same time, then the PSU would be pulling 344W from the wall outlet. This means that if the PSU is 85% efficient while pulling 344W from the wall outlet, then the computer is pulling 292W from the PSU. Your gaming power consumption though would probably peak at around 250-275W.
So yeah, the TX750 is quite overkill. The HX520 is modular, so I do recommend swapping. You'll be glad that you did. Plus, your average efficiency will go up a hair. lol :)