How much of a power supply do i need?

Im debating between a Corsair 650w or 850w power supply.
The 850 with discounts will run me about $30 more and I'd like to save all i can.

The components I'd need it to power are:

CM Storm Scout case
WD 640GB Cavair Blue
Ripjaws 2X2gb 1600 DDR3
ASUS DVD/CD burner
XFX 5850 HD 1GB
AMD Phenom IIx4 965
1 extra 120mm fan and
Artic Cooler freezer 64 CPU cooler
7 answers Last reply
More about power supply need
  1. The 650w will be plenty unless you decide to crossfire or sli cards like the gtx480, or 5970. I would say it would handle a single gpu sli/crossfire setup, but in that case I would go with the beefier of the two.
  2. Thanks, also in case anyone was wondering, I have no intention to OC anything. But crossfire may be a small chance in the future.
  3. Personally, I would grab this one and call it a day. Plenty for future upgrades, more fans, hard drives, sli/crossfire, etc.
  4. i think a 650w (especially since its very high quality) will do the job fine for now.
  5. These are the official recommended power requirements based on your graphics card:

    500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode).

    This applies to the entire system not just your graphics card.

    As you can see, a 650W unit will be above the recommended for your card even if you opt to Crossfire in the future. If you do want to have the extra headroom to be safe for future upgrades then the PSU sportsfanboy mentioned is a very solid unit, as is the one Corsair you pointed to. It may also be worth mentioning that PSUs are most efficient when they're running at less than their full load (usually about 50-60%). That being said, the 650W unit would do the job fine if you're on a budget. Hope this helps.
  6. I went w/the 850, it was on sale w/mail in rebate fo 90
  7. You actually would have been fine with a good 550W PSU.. Anyway, i guess you've secured yourself pretty nicely (on the PSU front atleast) for your future system(s) and major upgrade plans also..
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