Hello Luke, While John's idea may sound good, I doubt that's it (mainly because the throttling feature "CPU Thermal Control" was disabled in the BIOS)... but to prove it, I went ahead and restored normal clocking for a test run.
No change. If anything, slightly worse (as expected) even though its running about 7C cooler under 100% load. Iteration times up to between 0.139 to 0.148. Dropping a core or two still improves iteration times on the remaining cores. Thus, I'll return to the overclock to at least have those extra cycles. There just must be some inherent bottleneck in the Kentsfield quad cores, and for whatever reason my particular configuration is hit by it worse than 32 bit systems or those running less than 4 GB RAM. What a pity. Jeff Woods Reading, PA Luke Welsh wrote: > At 04:36 PM 12/21/2007 -0800, John R Pierce wrote: > >> its also possible that running all 4 cores full tilt is causing some >> thermal throttling... no matter HOW good your heatsink is, the CPUs can >> develop local hotspots internally under intense workloads and >> automatically slow down select execution units. >> > > Perhaps worthwhile to try underclocking? > > _______________________________________________ > Prime mailing list > [email protected] > http://hogranch.com/mailman/listinfo/prime > > _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
