FSP AU-700 vs. Seasonic X650 PSU

[OneOfTheWay]

I recently ordered a Dell XPS 8300 refurb. w/ i5 2300 cpu. I also order an XFX Radeon HD 6950. The Dell comes with a 460w psu, but the HD 6950 says minimum of 500w.

So I was looking at either the FSP AU-700 or the Seasonic X650 PSU's. Both I have priced at around $130. I want to be able to get a second 6950 in the future to crossfire.

Which PSU should I get or something else?

P.S. I am new to building/upgrading computers. I basically am getting all this because my current system won't play BF3

 

[slcmike]

The Seasonic is good

or

OCZ ModXStream Pro 700W Modular
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018

My personal favorite...if you have some extra cash...and it comes with the cables in a velvet bag, i mean come on!
CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010

 

[OneOfTheWay]

My personal favorite...if you have some extra cash...and it comes with the cables in a velvet bag, i mean come on!
CORSAIR Professional Series HX750 (CMPSU-750HX) 750W ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular
http://www.newegg.com/Product/Prod [...] 6817139010

I just checked out the AMD certified power supplies website http://support.amd.com/us/certified/power-supplies/Pages/details.aspx?item=497 and it didn't list the HD 6950. Not sure if that means it won't work or what.

 

[slcmike]

Go with this then...same thing, but its on your list.

CORSAIR Enthusiast Series TX750 V2 750W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

 

[davcon]

Dell psu's are conservatively rated,a 460w unit will be capable of 500w.
If you decide to replace it,do yourself a favour and buy a semi-modular psu.
You're working in an oem case which is tight for space/cooling and cable routing.

 

[Silvune]

Components don't need to be listed on anyone's website to be compatible with other components. In the case of graphics cards and power supplies, the power supply needs to have the correct number of PCIe connectors to match the graphics card. 6950s have two 6pin PCIe connectors. So if you want to be able to power a build with two then you would obviously need a PSU with four PCIe connectors.

The Seasonic X-650 is the best option out of the four mentioned so far. This is because it is the most efficient, has excellent voltage regulation and ripple and noise suppression (as does the HX750). It will be very quiet most of the time as it is semi fanless and has a very high quality fan. It is fairly academic but the fact that it is fully modular would be seen as an advantage by many over 'only' semi-modular units.

If having a velvet bag is important then the Seasonic X-650 matches that.

The Aurum 700 can get quite noisy as it's fan controller is not very well tuned. Voltage regulation and ripple and noise suppression aren't as good as the Seasonic and Corsair units, but they are good enough. Functionally it is up to scratch.

The ModXStream Pro 700W is not a very good option as, unlike most good ~700W PSU these days it only has 552W combined on it's 12V rails, and it doesn't have enough connectors for a build with two 6950s and has quite short cables - 45cm to the first connector.

Have you checked if there are any size restrictions to your PSU, as they are not all the same size and some cases aren't capable of holding larger than standard sizes.
Corsair HX 750 - 150x86x180
Seasonic X-650 - 150x86x160
FSP Aurum 700 - 150x86x140