According to my tests on an AMD Phenom II X6 1045T, speedup is marginal but probable in the average.

--

Fun and success!
Mario *LigH* Rohkrämer
mailto:[email protected]
Command, Date/Time, Elapsed Time, FPS, Bitrate, Y PSNR, U PSNR, V PSNR, Global PSNR, SSIM, SSIM (dB), Version
 --frames 240 --fps 30000/1001 -o test_x265_1080p.ultrafast.hevc --preset ultrafast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:06:28, 21.61, 11.11, 170.67, 56.744, 55.909, 56.818, 56.649, 0.999390, 32.148, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.superfast.hevc --preset superfast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:06:54, 25.22, 9.52, 177.64, 57.632, 56.827, 57.588, 57.526, 0.999663, 34.721, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.veryfast.hevc --preset veryfast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:07:21, 26.10, 9.19, 171.49, 55.912, 54.513, 55.734, 55.715, 0.999709, 35.357, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.faster.hevc --preset faster --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:07:48, 26.63, 9.01, 149.83, 56.822, 55.891, 57.183, 56.751, 0.999837, 37.871, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.fast.hevc --preset fast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:08:38, 48.50, 4.95, 74.50, 51.592, 49.986, 51.064, 51.325, 0.998771, 29.105, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.medium.hevc --preset medium --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:10:12, 93.57, 2.56, 71.00, 52.078, 50.349, 51.280, 51.762, 0.998895, 29.566, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.slow.hevc --preset slow --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:12:20, 127.85, 1.88, 64.83, 51.893, 50.674, 51.377, 51.676, 0.998717, 28.919, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.slower.hevc --preset slower --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:14:55, 154.41, 1.55, 62.26, 52.214, 50.821, 51.528, 51.954, 0.998714, 28.906, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.veryslow.hevc --preset veryslow --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:19:06, 249.97, 0.96, 60.31, 52.406, 50.964, 51.503, 52.113, 0.998931, 29.712, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_1080p.ultrafast.hevc --preset ultrafast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:46:14, 21.08, 11.39, 170.67, 56.744, 55.909, 56.818, 56.649, 0.999390, 32.148, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.superfast.hevc --preset superfast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:46:40, 25.04, 9.58, 177.64, 57.632, 56.827, 57.588, 57.526, 0.999663, 34.721, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.veryfast.hevc --preset veryfast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:47:07, 25.98, 9.24, 171.49, 55.912, 54.513, 55.734, 55.715, 0.999709, 35.357, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.faster.hevc --preset faster --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:47:34, 26.36, 9.11, 149.83, 56.822, 55.891, 57.183, 56.751, 0.999837, 37.871, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.fast.hevc --preset fast --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:48:22, 47.89, 5.01, 74.50, 51.592, 49.986, 51.064, 51.325, 0.998771, 29.105, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.medium.hevc --preset medium --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:49:49, 86.07, 2.79, 71.00, 52.078, 50.349, 51.280, 51.762, 0.998895, 29.566, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.slow.hevc --preset slow --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:51:49, 119.37, 2.01, 64.83, 51.893, 50.674, 51.377, 51.676, 0.998717, 28.919, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.slower.hevc --preset slower --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:54:17, 147.17, 1.63, 62.26, 52.214, 50.821, 51.528, 51.954, 0.998714, 28.906, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_1080p.veryslow.hevc --preset veryslow --psnr --ssim --csv test_x265_1080p.csv --input-res 1920x1080 -, 03/30/14 00:58:24, 245.78, 0.98, 60.31, 52.406, 50.964, 51.503, 52.113, 0.998931, 29.712, 0.8+244-a2df906d3405
Command, Date/Time, Elapsed Time, FPS, Bitrate, Y PSNR, U PSNR, V PSNR, Global PSNR, SSIM, SSIM (dB), Version
 --frames 240 --fps 30000/1001 -o test_x265_720p.ultrafast.hevc --preset ultrafast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:47:50, 9.56, 25.09, 150.63, 53.047, 51.819, 52.896, 52.874, 0.999074, 30.333, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.superfast.hevc --preset superfast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:48:02, 11.64, 20.62, 155.38, 53.881, 52.799, 53.784, 53.734, 0.999393, 32.168, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.veryfast.hevc --preset veryfast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:48:14, 11.89, 20.19, 140.17, 51.873, 50.731, 52.342, 51.789, 0.999485, 32.884, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.faster.hevc --preset faster --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:48:28, 13.24, 18.12, 130.95, 52.694, 51.732, 53.086, 52.623, 0.999729, 35.665, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.fast.hevc --preset fast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:48:55, 26.15, 9.18, 66.15, 47.817, 46.067, 48.481, 47.682, 0.998219, 27.494, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.medium.hevc --preset medium --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:49:49, 53.67, 4.47, 63.46, 48.015, 46.394, 48.662, 47.893, 0.998261, 27.597, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.slow.hevc --preset slow --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:50:57, 68.14, 3.52, 57.03, 48.719, 46.846, 48.657, 48.477, 0.998515, 28.284, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.slower.hevc --preset slower --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:52:19, 81.00, 2.96, 52.48, 48.714, 47.025, 48.775, 48.510, 0.998474, 28.165, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.veryslow.hevc --preset veryslow --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:54:45, 145.35, 1.65, 51.36, 48.889, 47.082, 48.700, 48.639, 0.998326, 27.761, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.placebo.hevc --preset placebo --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/29/14 23:58:13, 207.21, 1.16, 52.00, 49.475, 47.539, 49.110, 49.187, 0.998623, 28.611, 0.8+243-9b378e860ddb
 --frames 240 --fps 30000/1001 -o test_x265_720p.ultrafast.hevc --preset ultrafast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:34:35, 9.50, 25.26, 150.63, 53.047, 51.819, 52.896, 52.874, 0.999074, 30.333, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.superfast.hevc --preset superfast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:34:47, 11.59, 20.71, 155.38, 53.881, 52.799, 53.784, 53.734, 0.999393, 32.168, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.veryfast.hevc --preset veryfast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:34:59, 11.90, 20.17, 140.17, 51.873, 50.731, 52.342, 51.789, 0.999485, 32.884, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.faster.hevc --preset faster --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:35:13, 12.78, 18.79, 130.95, 52.694, 51.732, 53.086, 52.623, 0.999729, 35.665, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.fast.hevc --preset fast --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:35:37, 23.50, 10.21, 66.15, 47.817, 46.067, 48.481, 47.682, 0.998219, 27.494, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.medium.hevc --preset medium --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:36:23, 46.07, 5.21, 63.46, 48.015, 46.394, 48.662, 47.893, 0.998261, 27.597, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.slow.hevc --preset slow --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:37:30, 66.19, 3.63, 57.03, 48.719, 46.846, 48.657, 48.477, 0.998515, 28.284, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.slower.hevc --preset slower --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:38:50, 79.81, 3.01, 52.48, 48.714, 47.025, 48.775, 48.510, 0.998474, 28.165, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.veryslow.hevc --preset veryslow --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:41:17, 145.96, 1.64, 51.36, 48.889, 47.082, 48.700, 48.639, 0.998326, 27.761, 0.8+244-a2df906d3405
 --frames 240 --fps 30000/1001 -o test_x265_720p.placebo.hevc --preset placebo --psnr --ssim --csv test_x265_720p.csv --input-res 1280x720 -, 03/30/14 00:44:36, 198.07, 1.21, 52.00, 49.475, 47.539, 49.110, 49.187, 0.998623, 28.611, 0.8+244-a2df906d3405
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