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PSU wattage for my build

Last response: in Components
March 14, 2012 7:18:29 PM

Wondering what sort of PSU wattage I would need for my build. I calculated it earlier on extreme.outervision and arrived at 735 watts, but I had to make some approximations because not everything was listed (type of case fans and video card). Figured I would ask here just to be sure. Thinking of getting a 750 watt PSU. Would that be enough?

Processor:i5 2500k
Motherboard:Asus P8z68-v pro/gen 3
Video Card: XFX Radeon 7950 Black Edition
RAM: Corsair Vengeance 8GB DDR3
HDD: WD Caviar Black 1tb
SSD: Crucial M4 128Gb
Case: Silverstone FT02

Thanks in advance.

More about : psu wattage build

a c 121 ) Power supply
March 14, 2012 7:35:48 PM

That seems very high.
I went to and got 528W, using the HD6970 as the GPU. Are you going to run a pair of them?

Edit: Remember, you still have just one CPU, even though it has four cores.
a c 137 ) Power supply
March 14, 2012 8:11:20 PM

The new 28nm cards do not need that much power.
Here is the AMD system requirement for a 7950, 500w:

That assumes normal numbers of hard drives, fans, cpu, etc. Normally, those parts are in the 150w range.
The 7950 card itself can draw 75w from the slot, and 150w from the two 6 pin power connectors, so 500w is still a conservative number.

Other than price, there is no real downside to over provisioning the wattage a bit.

More importantly, buy a QUALITY psu.
If you buy Seasonic, Antec, PC P&C, XFX, or Corsair, you should be ok.
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a c 145 ) Power supply
March 14, 2012 11:03:16 PM

I pretty much agree with the previous posters. But keep in mind that the HD 7950 can draw up to 360W at peak load. (You'll probably never attain that, though) That translates into about 30A on the +12V rail(s). Be sure whatever PSU you purchase either has a single rail or split rails that can handle the current. Usually individual PCIe power cables are connected to different rails in split rail PSUs, so you can add them.
a c 145 ) Power supply
March 14, 2012 11:44:55 PM

Sorry for the double post. The site keeps crashing for me...
a c 145 ) Power supply
March 14, 2012 11:46:06 PM

delluser1 said:
See the " CF " there ?
Go down a little further

My bad. Leaving in embarrassment....