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850w or 1000w?

Hi! I will be building my first machine from scratch in a few days and was curious if I should get a 850w or a 1000w psu. I think 850 would be enough but wanted to double check what others thought.

So far what im looking at is:

Corsair Obsidian 800d
i7 2600k
GTX 580
8-16g ram (not sure if i need more then 8 for gaming)
1 SSD for boot drive and WoW
1 large hdd for rest of my games and stuff.

Thanks for reading!
8 answers Last reply Best Answer
More about 850w 1000w
  1. Whoa. I came here to ask a nearly identical question! Why is this sort of info so hard to track down?

    I'm thinking about something in the 570/560/6950 (flashed to 6970) range, with headroom for possible second card in the future.
  2. sli in future? overcloccking?.if you want to sli with minimal overclocking get the 850 if you want extreme overclocking get the 1000
  3. I might SLI in the future once the 580s drop in price. I was planning on overclocking the 2600k to 4.6 or so I think is where iv heard it can go easly.
  4. I guess a good 850W PSU can actually handle a couple of GTX 580's and a modestly overclocked i5.. 650W is enough for a single card setup..
  5. Best answer
    It's really very easy....i..lke everything else....if ya know where to look. Use a PSU calculator

    http://www.antec.outervision.com/

    850 watts and 1000 watts are way more than enough for any single current card. A good 650 watter is just fine.

    With any current card but the 580, a quality 850 watter is plenty for SLI and overclocking.

    For comparison purposes , the list below contains performance ratings (10 scale) at jonnyguru.com / prices as per newegg on 12/31/2010 and ones w/ double asterisks (**) made it onto silentpcreview.com's Editor's Choice List meaning they excelled at both electronic and acoustic performance:


    Antec SG-850 - 10.0 ($250) **
    Antec CP-850 - 10.0 ($120) **
    XFX 850W Black Edition 10.0 ($130)
    Corsair HX850 850W - 10.0 ($170)

    Antec TruePower Quattro (TPQ-850) - 9.5 ($150)
    Corsair TX850 - 9.5 ($130)
    Seasonic M12D 850W - 9.5 (NLA) **
    NorthQ Giant Connector 850W - 9.5 (NFS)
    Etasis ET850 - 9.5 (NLA)
    Silverstone Zeus ST85ZF - 9.5 (NLA)

    Enermax Revolution 85+ 850W - 9.0 (OOS)

    Thrmaltake Toughpower XT 850W - 8.5 (NLA)
    OCZ Z Series 850W - 8.5 ($165)

    NorthQ Black Magic Flex 850W - 8.0 (NFS)
    Coolmax CTG-850 - 8.0 (NFS)

    SilverStone Decathlon DA850 - 7.5 (NLA)
    Enermax Galaxy DXX 850W EGX850EWL - 7.5 (NFS)

    SilverStone Strider ST85F - 7.0

    Silverstone Element ST85EF 850W - 6.0


    OOS - Out of Stock / NFS - Not For Sale / NLA = No Longer Available

    For twin 580's, move up to a 1000 watter from the same brand series as the 10.0 rated ones above.
  6. I'd agree with Emperus that a good 850W unit such as the higher scoring ones that JackNaylorPE listed above would power two GTX 580's and still have room for a little overclocking.

    SOURCE: http://www.guru3d.com/article/geforce-gtx-580-sli-review/14

    Even the system they test on in the above article uses an overclocked i5. That being said a PSU is often more efficient when it's not being pushed close to full load so the OP may want to opt for a 1000W unit for this reason or if he wanted the extra headroom. If the OP is on a tighter budget however a solid 850W would meet his current needs and allow for an extra card in future.
  7. Thanks for all the answers everyone. I had used 1 of the psu calculators but wasnt sure if it was accurate as it says 596w minimum. So just wanted to check. I will be going with teh 850 if i can find the corsair one i want locally. Thanks again for all the help :)
  8. Best answer selected by woody_61.
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