- Sep 20, 2010
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Thought I'd share some test results of stress testing SB with Linpack to show the difference between running with the new AVX (256bit registers) and the older SSE (128bit registers). SSE results gave ~47GFlops @ 3.4GHz while AVX results gave ~83GFlops @ 3.4GHz.
Stock CPU clocks, 33x multi with 34x 4 core turbo.
Stock Vcore (Auto).
Stock cooler.
EIST disabled.
C1E, C3, C6 disabled. This means higher idle temps/power but makes it easier to see what is happening with the loadline.
The first run is using the standard SSE 128bit registers.
Measured power into the VRM was ~89W
The second run is using the AVX 256bit registers. I haven't heard if there's going to be support for use of the AVX registers in Windows versions earlier than W7 SP1.
Measured power into the VRM was ~108W
On the 4th run some turbo throttling can be seen, turbo shown as yellow. This seemed to happen a little before PROCHOT and TDP.
Working with CPU temperature and VRM power seems to show an increase of ~20% in power usage over running SSE while the Intel energy register shows ~30%. Some further investigation is required for the discrepancy.
Notes:
Realcore EIST TM mode works a little like TMonitor. Core numbers are APIC numbers and may appear odd but there are only 4 cores. Time in seconds on the Y axis and multiplier/load on the x-axis. Sampling is 100x per second. Averaged multi shown under the core number is calculated over the first section which in this case is 0.0 to 1.0 seconds.
Realcore PECI uses the PECI interface to report the hottest core with a 1/64th degree resolution.
Stock CPU clocks, 33x multi with 34x 4 core turbo.
Stock Vcore (Auto).
Stock cooler.
EIST disabled.
C1E, C3, C6 disabled. This means higher idle temps/power but makes it easier to see what is happening with the loadline.
The first run is using the standard SSE 128bit registers.
Measured power into the VRM was ~89W
The second run is using the AVX 256bit registers. I haven't heard if there's going to be support for use of the AVX registers in Windows versions earlier than W7 SP1.
Measured power into the VRM was ~108W
On the 4th run some turbo throttling can be seen, turbo shown as yellow. This seemed to happen a little before PROCHOT and TDP.
Working with CPU temperature and VRM power seems to show an increase of ~20% in power usage over running SSE while the Intel energy register shows ~30%. Some further investigation is required for the discrepancy.
Notes:
Realcore EIST TM mode works a little like TMonitor. Core numbers are APIC numbers and may appear odd but there are only 4 cores. Time in seconds on the Y axis and multiplier/load on the x-axis. Sampling is 100x per second. Averaged multi shown under the core number is calculated over the first section which in this case is 0.0 to 1.0 seconds.
Realcore PECI uses the PECI interface to report the hottest core with a 1/64th degree resolution.
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