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Which psu? Coolermaster or Corsair?

Another vote for the Corsair. I have the HX 520. I like it better than my CoolerMaster PSU.
 
I run that Corsair and I've been very pleased with it. Easily runs my overclocked Q9550 and 5850 Xfire setup.
 
Both are high quality PSUs. The Corsair one has been made by Seasonic, while the CM one has been made by Enhance Electronics.
Anyway, The Corsair HX650 is a bit better. If you can afford the price, I highly recommend you to go for it.

It presents a great efficiency (80 Plus Bronze certified) and a very good voltage stability (voltages are close to their nominal values). Moreover, the ripple and noise levels are extremely low.
It comes with semi-modular design (it presents some cables permanently attached to the PSU).
It supports even two very high-end video cards that require two power connectors each due to the four (6+2)-pin PCIe connectors.

It provides a single +12V output that is rated for up to 52A (624W)
The built quality is excellent. All electrolytic capacitors are Japanese from Chemi-Con (in the primary there is one capacitor (580µF, 400V) which is labeled at 105º C while the cpas in the secondary are also labeled at 105ºC.

7 years warranty.
Amazing PSU...
 
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