I've used HWiNFO on Core 2 Duo, Core 2 Quad, i7-900, and i7-2000 CPUs. Anyway, could the temps you are seeing there be the trigger of something? But AIDA64 does not show any throttling. i7-900 CPUs report core temps about 10C above the CPU temperature, while i7-2000 CPUs do not report core temps above the CPU temp, and are often reported lower than the CPU temp. You might argue that those temps do not correspond to the Tcase temp, but can we be sure of that with these new CPUs? I've noticed a difference between i7-900 and i7-2600 CPUs in the relationship between their core temps and CPU temp. The AIDA64 core temps just prior to the start of the decrease in GFLOPs (the line you have highlighted in LinX) are 69C, 74C, 75C, and 71C (IMO SpeedFan temps are to low.) Tcase for the i5-2500k is 72.6C. Going from 103 to 74 GFLOPs is significant and not a minor glitch. Well it sure seems like a performance drop during the test, without any signs of throttling, which is the weird situation. But after 3-5min idle Cinebench and all tests perform normally. When the performance dropped after 10-15min linx, Cinebench and other tests are performing poor as well. I've searched on other forums, other 2500k's perform about 108GFlops constantly for hours of linpack running.ītw: The cooler is an Arctic Cooling Freezer Xtreme rev2. No freq throttling, no background programs, cpu time is OK, core temp and power falling is the same. Performance drop: -26%! Max core temps: 74-75C. There are 3 shots with the last settings, 4.4GHz, TM1, TM2 disabled: (with and without other mixed settings, TM1, TM2 disabled.) Manual cpu freq and settings: Turbo short and long TPD limits: 250W, Core current limit:250, Manual multiplier=44, vCore: Auto (1.38V under linx) / Offset -0.080V (1.30V under linx) / Fix 1.27V (under linx). Manual cpu freq and settings: Turbo short and long TPD limits: 250W, Core current limit:250. Default cpu frequency, fixed, increased vcore: 1.25V. Default cpu frequency, but TM1, TM2, overt temp protect disabled. Core temps and cpu power are decreaseing under the test. There is no unnecessary programs running (i've killed all of them before the test) Hw monitor setting (over temp protection on): I've some shots from the default UEFI settings and the test: (But there is no reason for throttling or any specific sign of them) I think it's not a normal operation from any cpu, even if it's throtting. When all UEFI setting are on default there is also the same performace drop. I've tried everything in the bios settings, i' think.
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