Are you thinking of upgrading your Athlon II Processor to something in the X2 or X4 range from AMD. We are testing the AMD Athlon II X4 645 against the AMD Athlon II X2 265, AMD Athlon II X2 255 and AMD Athlon II X2 240 Processors to find out if Quad Core really is better than Dual Core. The fight between the AMD Athlon II X4 and AMD Athlon II X2 is going to be brutal. All of the AMD Athlon II Processors supports MMX+, 3DNow+, SSE, SSE2, SSE3, SSE4A, x86-64 and AMD-V. We will be using some demading Benchmarks for testing the AMD Athlon II Processors which are:- Windows Experience, Cinebench, Computmark, Everest, Geekbench, Nuclearus and Performance Test. Games are Hawk 2, Lost Planet 2, Mafia 2, Metro 2033 and Resident Evil 5

http://www.ultimatehardware.net/amd/amd_athlon_ii_x4_vs_x2.htm