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Which PSU to buy?

I am not sure which PSU to buy. I am planning on picking up 2 radeon hd 6870, 1 1TB 7200 rpm Drive, 3-4 2TB 5400 Drives, and an AMD phenom II X6 processor. I have narrowed it down to the following power supplies. I am unsure if 750W or 850W is better. I would like to future proof it so I do not have to buy another power supply. Also unsure if modular or non-modular is better/reasonable for the price increase. I plan on picking up the cooler master haf 922 case. I am willing to pay more, if the benefits are justified. Thanks for your help.

Corsair HX850W 157.08
http://www.ncix.com/products/index.php?sku=38650&promoid=1101

Corsair HX750W 134.99
http://www.ncix.com/products/index.php?sku=38649&promoid=1260

Corsair AX850W 160.61
http://www.ncix.com/products/index.php?sku=53719

Corsair AX750W 144.32
http://www.ncix.com/products/index.php?sku=53717

Corsair TX950W 131.79
http://ncix.com/products/?sku=43101&vpn=CMPSU-950TX&manufacture=Corsair

Corsair TX750W 94.79
http://www.ncix.com/products/index.php?sku=26415

Corsair TX850W 121.27
http://www.ncix.com/products/index.php?sku=35156&promoid=1254

XFX 850W Black Edition 137.38
http://www.ncix.com/products/index.php?sku=43569&promoid=1259

XFX 750W Black Edition 115.69
http://www.ncix.com/products/index.php?sku=48568
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  1. All the PSU's you have chosen are way too overkill for what you need. If you are not planning to CF, the Seasonic 520W Bronze PSU would cover all your needs. I think the model number is M12D or something.
  2. Best answer
    1-anh said:
    I am not sure which PSU to buy. I am planning on picking up 2 radeon hd 6870, 1 1TB 7200 rpm Drive, 3-4 2TB 5400 Drives, and an AMD phenom II X6 processor. I have narrowed it down to the following power supplies. I am unsure if 750W or 850W is better. I would like to future proof it so I do not have to buy another power supply. Also unsure if modular or non-modular is better/reasonable for the price increase. I plan on picking up the cooler master haf 922 case. I am willing to pay more, if the benefits are justified. Thanks for your help.

    Corsair HX850W 157.08
    http://www.ncix.com/products/index.php?sku=38650&promoid=1101

    Corsair HX750W 134.99
    http://www.ncix.com/products/index.php?sku=38649&promoid=1260

    Corsair AX850W 160.61
    http://www.ncix.com/products/index.php?sku=53719

    Corsair AX750W 144.32
    http://www.ncix.com/products/index.php?sku=53717

    Corsair TX950W 131.79
    http://ncix.com/products/?sku=43101&vpn=CMPSU-950TX&manufacture=Corsair

    Corsair TX750W 94.79
    http://www.ncix.com/products/index.php?sku=26415

    Corsair TX850W 121.27
    http://www.ncix.com/products/index.php?sku=35156&promoid=1254

    XFX 850W Black Edition 137.38
    http://www.ncix.com/products/index.php?sku=43569&promoid=1259

    XFX 750W Black Edition 115.69
    http://www.ncix.com/products/index.php?sku=48568



    I would choose either a Corsair or XFX 750 watt unit. It is more than you need by a bit but will leave you future upgrade room. Both Corsair and XFX are very high quality and you could probably get by fine with a 650 watt unit but I would go with a 750 just for headroom.
    Modular will be more expensive but better for case airflow.
  3. @ hell_storm200, oh but the AMD website specifys that crossfiring radeon 6870 requires a minimum 600 watt psu. I am also planning on running several HDD for storage.

    @anort3, Modular does seem the way to go. would 850W be a good idea in case I add more HDD in the future? or do HDD not take up much power?
  4. Hard drives use hardly any power at all. 750w is plenty for you.
  5. @ anort3, Thanks for the quick response. I forgot to mention I plan on OC'ing the CPU to around 3.8 GHz on air and OC'ing the GPU a bit as well. 750W still enough or would I be pushing it?
  6. AMD website puts high watt requirements due to the low quality PSUs out there.

    A high quality Corsair could run 6870 crossfire on 500W, however hell_storm wasn't talking about crossfire. :)

    If you plan on crossfire do go with some extra headroom (600w+) but with only a single 6870 you don't need much at all tbh.
  7. Nope 750w is still fine. You can run 2 x GTX480s on a quality 850w unit so as I said before 750w gives you a bunch of headroom to even upgrade graphics in the future. You really could probably get by with 650w. But I would rather have a bit too much than push it.
  8. @ raidur, oh I didnt know AMD did that. I will probably end up going with a quality 750W now. but for the extra bit of money the 850W seems like it will last me alot longer. The price difference for the gold series is only $16 for an extra 100W of headroom. Might be worth the investment for the future.

    @ anort3, I agree. I? do not want to push my components too hard.
  9. Considering that you go for crossfire in the future, i would suggest: Corsair TX750W.
    Seasonic X750W.

    These two would be my first choice.
    Then comes the XFX Black 750W.

    If no crossfire, then VX550W would be enough.
  10. it is such a interesting topic on readon to picking PSU
    PLR Rights
  11. Best answer selected by 1-anh.
  12. This topic has been closed by Maziar
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