|24 Feb 2011||#1|
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Odd W7 Resource Monitor behavior
Recently built a new I-7 2600K around the Asus P8P67 motherboard. Noticed Windows 7 resource monitor CPU max frequency was plummeting when testing with Prime95 or just using CPU intensive apps like LTSpice or CAD. Also noticed that once I let the computer sleep, even just for just a sec or two, Windows 7 resource monitor behaves as it should and the computer speeds up a bit when using CAD, Ltspice, or such. So, something is changing before and after sleep, has been driving me crazy trying to find out what that change is to no avail. A pic demonstrating the issue clearly is attached below.
Spent a good deal of time trying to see if anything service or process-wise changed before and after sleep to no avail, many benchmarking and other tests and such as can be seen in the links here, though I think it has come down to a Windows 7 64bit issue of some sort at this point (or perhaps a Sandy bridge driver issue?):
CPU max frequency problem and i7-2600k - CPUs - CPU-Components
W7 Resource Monitor and i7-2600k problem - [H]ard|Forum
Only "progress" I've made is since I use an NVidia graphics card, I have always have EVGA precision set to run when Windows starts. On my I7-860 machine (also has Windows 7 64 bit), I don't have this issue, so it never dawned on me to turn Precision off.
Well after turning off Precision (and before letting the computer sleep), running no other monitoring software, the max CPU frequency rebounds in Windows 7 resource monitor while running Prime95. Not a stable full speed line like I get after sleep, but it generally bounds between 90%-112% max frequency (computer is OC'ed to 4.4Ghz currently, though stock clocks make no difference in this issue). If I turn on EVGA Precision, max CPU freq plummets as usual. If I turn that off and turn on real temp 3.67, CPU freq also plummets, same deal for Throttlestop. CPU-Z is the only thing that won't plummet the CPU freq in Resource Monitor while Prime95 is running and before the computer has been allowed to sleep.
Now after letting the computer sleep, I can run all of these programs individually or together and the max CPU frequency in Windows 7 Resource Monitor will stay pegged and solid at 126% running Prime95 (or other CPU stressing apps). Don't know what changes after sleep here, but hoping the above may give someone here an insight as to what the issue may be, and hopefully how to resolve it. Would VERY much appreciate it, thanks.
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