I'm working on an upgrade from a E6600 to a quad core and would like to compare performance. I'm not really interested in graphics benchmarks, but if that is part of the answer, so be it. The test rig has a HD 3870, motherboard is an ASUS P5Q Deluxe, currently with 4 GB DDR2-1066 Ram (will be upgraded to 8GB in the future). Benchmark software suggestions? Software must be FREE!!!