AMD Phenom II Black Edition CPU's have been a popular choice for enthusiasts and budget-conscious overclockers lately, and Benchmark Reviews decided it was time to focus on AMD in one of our Best CPU Cooler Performance series. In this preview article, Benchmark Reviews tests several CPU coolers on the AM3 socket for the AMD Phenom-II platform. An overclocked AMD Phenom II X4 965 "Black Edition" processor was used (original 125W version), and given a heart-warming 1.55 volts to the vCore so it could reach 4000MHz (4GHz) stable. The heat produced at 1.55V caused at least one product to earn high marks in our tests, while another fell so far below respectible performance that it pains us to expose it.