These are all in German, with an English manglation provided by Google, but they might be worth a look-see.

Planet3DNow do some stress-testing of the Cougar S550 80Plus Silver 550W PSU

TweakPC take a look at the MSI 790FX-GD70 motherboard

From the Cougar S550 80Plus Silver review:

The Cougar S-550 with 550W is the pioneer of a new middle class. Das Modell knackt die 90% Effizienzmarke bei 230 VAC/50 Hz problemlos und trägt den DC-DC Converter mit zwei VRM-Modulen in den moderaten Leistungsbereich. The model will crack the 90% efficiency at 230 VAC / 50 Hz mark easily and carries the DC-DC converter with two VRM modules in the moderate range of performance.

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From the 790FX-GD70 Review:

During our tests, we have learned many things about the MSI 790FX-GD70 but nothing really unpleasant.  On the contrary, the motherboard fascinated from the moment of unpacking, the normal operation, up to "playing" with the extras. The approximately 140, - Euro, which fork out a buyer for the MSI 790FX-GD70 must for most prospective probably a lot of money.

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