Which PSU to buy?

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1-anh

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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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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.
 
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1-anh

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@ 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?
 
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1-anh

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@ 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?
 
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Raidur

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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.
 
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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.
 
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1-anh

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@ 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.
 
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