Possible need for a new PSU?

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18 Mar 2007
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Hi guys, I have a 5870 coming over the next couple of days, as well as a new I7 motherboard/Ram/processor combi. Seeing as I still have some cash banging around, I am contemplating getting another 5870 for crossfire. However, my current PSU is a two year old Corsair 520hx, which seems a little low for me.
I used a PSU calculator, which said at 90% usage the whole machine would be pulling 517 watts, which is a little too close for comfort. Should I get a new PSU? If so, which one would you go for? Bearing in mind that PSU money comes out of the second 5870 fund :(
 
I don't really understand why some people buy 850W+ PSU's with dual-card Crossfire / SLI as their reasoning for doing so. It just seems unnecessary.

Just a passing comment by the way...
 
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