Need help choosing Power Supply for new build

Hi all.

I need help choosing a power supply for a new build I am working on. Looking to do an mATX build in a small case.

CPU: Intel Core i5-2500K
MOBO: ASUS Maximus IV Gene-Z LGA 1155 Intel Z68
RAM: G.SKILL Sniper Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900)
GPU: EVGA GeForce GTX 590 (Fermi) Classified 3072MB 768-bit GDDR5
CPU Cooler: Corsair H60
or
Corsair H100 (If I can make it fit in the case)
SSD: Crucial M4 CT128M4SSD2 2.5" 128GB SATA III MLC Internal Solid State Drive (SSD)


And of course I will have an optical drive as well. And it will have 3 fans with the H60 or 4 fans with the H100.

My main question is will 650w be enough? Or will I perhaps need a 750w or even 850w? I used the Corsair AX750 for my current build and am planning on using the same series of PSU.
8 answers Last reply
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  1. The 750w will be better. The 650w is just risking it too much.
  2. cutebeans said:
    The 750w will be better. The 650w is just risking it too much.



    yup, you should buy 750w psu.
  3. A 700w PSU is recommended by Guru3D. You would probably be fine with a Corsair 650w unit, but to be on the safe side, 750w is probably the best choice. You at least then leave lots of headroom for Over-clocking and other hardware.
  4. Ok thanks guys. So an 850 would be overkill?
  5. Yeah 850w would be pretty much overkill.
  6. cutebeans said:
    Yeah 850w would be pretty much overkill.


    Thats Right :)
  7. A gtx 590 in a mATX case? I wanna see that :D
  8. Lol. It should have no problem fitting in my new fractal design design mini once i remove the HDD bays. It would even fit inside my cheap-o 30 dollar broadway com corp case.
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