My cousin has a Silverstone Sugo SG05-450(http://www.newegg.com/Product/Product.aspx?Item=N82E16811163171) that came with a 450w PSU, his current setup is H60+Llano APU and I might get him a 6850 (http://www.newegg.com/Product/Product.aspx?Item=N82E16814125353). Curious if the 450w will suffice? From looking at the PSU specs it looks like the +12v rail has 36A (http://www.silverstonetek.com/product.php?pid=276).