The second thing that we noticed on the label was the phrase “The +3.3 V & + 5 V & +12V1 & +12V2 combine power shall not exceed 431.5 W.” What? If you add this to the maximum power for -12 V and +5VSB we have a total of 450 W! So despite the product name, the label states in a format hard to be understood by the average user that this is in fact a 450 W power supply. As you know, we are completely against this kind of trick used by some manufacturers, and we honestly think that companies like this should be sued, as they are clearly trying to induce consumers to error. Nevertheless, for now we have to give Cooler Master the benefit of the doubt; let’s see during our load tests what is the real maximum power this unit can deliver.
There are some 500ish watt power supplies I would trust to run a 7950 just fine - for example the Seasonic 520 watt would probably be fine with it, since it has a single 40A 12v rail (http://www.newegg.com/Product/Product.aspx?Item=N82E168...). On the other hand, your current power supply is pretty poor - with two 12v rails rather than a single powerful one, it might not blow up, but it could very well cause hard to trace crashes or glitches under heavy load.