MysteryGuy
n00b
- Joined
- Jan 31, 2017
- Messages
- 3
Hi;
I'm trying to determine if (what appears to be) unexpected (below base frequency) throttling on my new system is expected or not. When I run various stress test programs like Prime-95 and the Intel Processor Diagnostic Tools Floating Point and Prime number tests, I see the multiplier fall below the 'Base Frequency'.
The symptom I'm seeing on my new system is that some stress tests (like Intel XTU Stress CPU, and the Intel Processor Diagnostic tool CPU Load test) will run up to all available cores at 38x. (The E5-1650 v4 says its base frequency is 3600 MHz, and the max Turbo boost is 4000 MHz).
But, running one or more threads of Prime-95 will cause the cores running these threads to down-clock to 35X, which is below the base of 3600 MHz.
When this is happening, cores not running Prime-95 still report 38X (under the Windows 7 High performance profile). Temps. all appear to be fine.
Similarly, I see slower 35x multiplier use when running the Intel XTU benchmark, and the Intel Processor diagnostic tools Floating point and Prime number tests.
I don't know if it's related, but I came across an Intel document [Intel Xeon Processor E5 v3 Product Family Processor Specification Update] that indicates reduced processor speeds may be encountered when AVX instructions are run on an E5-1650 v3.
I have an E5-1650 v4, but can not immediately find similar specifications for it (as to if and how much throttling would be expected for AVX usage). The version of Prime-95 I'm running (28.10) does say it's using AVX or AVX-2 instructions.
And , if I turn off 'AVX' for Prime-95 in 'local.txt', then I see up to 12 Prime-95 threads all running at 38x/ 3800 Mhz.
I'm trying to figure out if what I see is expected for this CPU. Anyone have an E5-1650 v3 or v4 and can tell me if you see similar throttling when running the current Prime-95 (v 28.10), etc. ?
Any help would be appreciated.
Thanks;
P.S.: My system is an Asus X99-E WS/USB 3.1 with BIOS 3402 running Windows 7 64-bit.
I'm trying to determine if (what appears to be) unexpected (below base frequency) throttling on my new system is expected or not. When I run various stress test programs like Prime-95 and the Intel Processor Diagnostic Tools Floating Point and Prime number tests, I see the multiplier fall below the 'Base Frequency'.
The symptom I'm seeing on my new system is that some stress tests (like Intel XTU Stress CPU, and the Intel Processor Diagnostic tool CPU Load test) will run up to all available cores at 38x. (The E5-1650 v4 says its base frequency is 3600 MHz, and the max Turbo boost is 4000 MHz).
But, running one or more threads of Prime-95 will cause the cores running these threads to down-clock to 35X, which is below the base of 3600 MHz.
When this is happening, cores not running Prime-95 still report 38X (under the Windows 7 High performance profile). Temps. all appear to be fine.
Similarly, I see slower 35x multiplier use when running the Intel XTU benchmark, and the Intel Processor diagnostic tools Floating point and Prime number tests.
I don't know if it's related, but I came across an Intel document [Intel Xeon Processor E5 v3 Product Family Processor Specification Update] that indicates reduced processor speeds may be encountered when AVX instructions are run on an E5-1650 v3.
I have an E5-1650 v4, but can not immediately find similar specifications for it (as to if and how much throttling would be expected for AVX usage). The version of Prime-95 I'm running (28.10) does say it's using AVX or AVX-2 instructions.
And , if I turn off 'AVX' for Prime-95 in 'local.txt', then I see up to 12 Prime-95 threads all running at 38x/ 3800 Mhz.
I'm trying to figure out if what I see is expected for this CPU. Anyone have an E5-1650 v3 or v4 and can tell me if you see similar throttling when running the current Prime-95 (v 28.10), etc. ?
Any help would be appreciated.
Thanks;
P.S.: My system is an Asus X99-E WS/USB 3.1 with BIOS 3402 running Windows 7 64-bit.