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I must be doing something wrong because the OpenCL build is about 2-3% slower with OpenCL activated than with the --no-opencl switch.
My PC is a Core2Duo E8200@3.4 Ghz with an Ati 5850 and Windows XP 32 Professional. I'm running the 11.12 Catalyst drivers which are the last to support OpenCL under XP. I can see my card speeding up from idle when running the OpenCL build but the load stays at 0%. I have tried OpenCL with other tools and benchmarks (to make sure it works) and the GPU load goes to 100%.
My x264 settings are
x264.exe --level 3.1 --preset slow --tune film --crf 20 --vbv-bufsize 14000 --vbv-maxrate 17500 --vbv-bufsize 14000 --vbv-maxrate 17500 -o e:\trailer.mkv e:\trailer.avs
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