It's a myriad of answers. The Mlucas run used a larger FFT than was necessary, partly due to multithreading reasons. The Mlucas code also only uses SSE2 instruc

It's a myriad of answers. The Mlucas run used a larger FFT than was necessary, partly due to multithreading reasons. The Mlucas code also only uses SSE2 instructions, where the overclocked i7-2600K using GIMPS' Prime95 program is fully AVX capable. I would also expect that the i7 runs at a higher frequency, with a higher IPC, than the server. The "main" CUDALucas run took around 90 hours on a GTX 580. We didn't even hear about the 560 Ti run by Gilchrist, that was on the side. Here are some links: http://www.mersenneforum.org/showpost.php?p=325878&postcount=12 http://www.mersenneforum.org/showpost.php?p=325878&postc... http://www.mersenneforum.org/showthread.php?p=325951#post325951 http://www.mersenneforum.org/showthread.php?p=325951#post325... http://www.mersenneforum.org/showpost.php?p=325995&postcount=38 http://www.mersenneforum.org/showpost.php?p=325995&postc... http://www.mersenneforum.org/showpost.php?p=326020&postcount=51 http://www.mersenneforum.org/showpost.php?p=326020&postc...