Dead Things Posted June 6, 2012 Posted June 6, 2012 Good question. Long answer. Apologies in advance. Windows uses something called "processor groups" to accommodate systems with more than 64 logical processors. With 80 logical processors, the system would be divided into two processor groups comprised of 40 logical processors each. You can manually edit the BCD to change the processor group membership characteristics, but one thing that cannot be changed is the 64-processor ceiling per group. While this processors group implementation works for parallelized tasks, it does not work for symmetric tasks meaning that you're essentially limited to 64 cores in Windows for any one particular process. Because UCBench is actually really well-coded, each thread does not leave much processing headroom for hyperthreading, so it benefits way less from HT than, say, wPrime. As such, my score with 32 cores enabled and HT on was way lower than my score with all 40 enabled and HT off. I had some hope that Server 8 would do away with the clumsy processor group implementation, but that was not the case last time I checked. By comparison, Ubuntu has supported >64 threads per symmetric task since 10.04. Quote
Hyperhorn Posted June 6, 2012 Posted June 6, 2012 That's some nice raw CPU power! I guess you use this setup for F@H normally, right? Quote
BuizelON Posted July 10, 2012 Posted July 10, 2012 *drool* What motherboard did you use for this submission? Quote
Amir-Az-Iran-Busheher Posted December 24, 2012 Posted December 24, 2012 wooooow nice nice you undie Quote
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