Power Supply Question

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Higach

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In a few months I am thinking about upgrading my 7950gt to an 8800GT (or maybe a 9 series). When I do this, I figure I most likely will need to upgrade my FSP Saga 400W to a higher power supply. I don't plan on going SLI, just 1 card.

Now my question is if I need a new power supply, are either of these better than the others? Or does it really not make that much of a difference

Newegg.com - XCLIO STABLEPOWER 500W ATX 500W Power Supply 100 - 240 V UL, CUL, TUV, CB, VDE, FIMKO, DEMKO, NEMKO, SEMKO - Retail
Newegg.com - APEVIA Concord ATX-MR500W ATX12V 500W Power Supply 115/ 230 V UL, CSA, FCC, CE, CB, TUV - Retail
Newegg.com - Thermaltake Purepower W0100RU ATX 12V 2.0 500W Power Supply 115/ 230 V UL, CUL, TUV, FCC, and CB certification - Retail

Also I am curious why Newegg.com - Thermaltake W0093RU ATX 12V 2.0 Version 500W Power Supply 115/230 V UL, CUL, TUV, FCC, and CB - Retail is more expensive than the 3rd PSU I listed.

Any help is appreciated.

Thanks
-Higach
 
The all have pretty low amperage. The Stablepower specs look good and it has active pfc. However I've read some bad reviews on it. There is a member Joowan that is selling some Enermax Liberty 500w's for 80 bucks on here which is pretty cheap and it is dual rail w/ 22 amps each. Its a beast of a psu. You should save a couple more bucks for a good PSU as they can make or break your rig.
 
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