This article compiles the best benchmark results we collected of various CPU models using x264 HD Benchmark 4.0, a free CPU benchmark developed by graysky, Dashken and Adrian Wong. This CPU performance comparison guide currently covers 98 different CPU models plus another 283 CPUs in the older comparison but this is just the beginning. We will keep updating the results as new results come in, so please contribute your results.

If you would like to participate in this endeavor, head over to the x264 HD Benchmark 4.0 page and download a copy. After you obtain your benchmark results, simply post them in the official forum thread of x264 HD Benchmark 4.0. Please post your results even if your processor is already listed in the comparison. This is because we will use your results if they are better than the results currently listed in the comparison.

Here is the list of updates :
- Added the Intel Xeon E5645 workstation processor (overclocked to 3.4 GHz).
- Added the AMD Phenom II X4 965 BE desktop processor.
- Added the Dual Intel Xeon E5130 workstation processors.
- Added the Intel Core 2 Duo E7300 desktop processor.
- Added the Intel Pentium E2200 desktop processor.
- Added the Intel Core 2 Duo E6320 desktop processor.
- Added the Intel Core 2 Duo E4300 desktop processor.
- Added the Intel Pentium M 750 mobile processor.



Link: TechARP