Hi, i have 2x Xeon E5 2687W v2 on Supermicro X9DAi running Windows 8.1.
Intel Turbo Boost is acting very funny on this computer:
On no load CPU runs at 1.2 GHz - this is ok.
On full load (32 threads) both CPUs runs at 3.6 GHz - this is ok.
On 1-2 thread load CPUs runs at 3.4 GHz (expected 4 GHz or 3.9 GHz)
On 3-4 thread load CPU runs also at 3.4. When i manually set affinity to force all threads to run on single CPU, CPU runs at 3.6-3.7
So - massively muti-threaded apps runs super fast (2495 points Cinebench R15). Workloads with low number of threads (this includes also even most demanding games ;-) ) runs rather slow. Single-threaded Cinebench R15 - 120 points.
Switching off HT helps a little bit. It is easier to "force" computer to go into TB.
I use Argus Monitor, ThrottleStop, and Intel's own Tubo Boost monitoring app to watch current frequency.
There is ugly workaround to this problem. When i set in power management minimal cpu speed to 100%, problem disappears (single-threaded Cinebench R15 - 138 points). Computer power usage is 30W higher at idle though.
I have latest BIOS, latest drivers, latest Intel INF. EIST, Turbo are enabled in BIOS. Fiddling with NUMA, C1E, enabled C states, core parking makes no difference.
Any help would be appreciated.
Intel Turbo Boost is acting very funny on this computer:
On no load CPU runs at 1.2 GHz - this is ok.
On full load (32 threads) both CPUs runs at 3.6 GHz - this is ok.
On 1-2 thread load CPUs runs at 3.4 GHz (expected 4 GHz or 3.9 GHz)
On 3-4 thread load CPU runs also at 3.4. When i manually set affinity to force all threads to run on single CPU, CPU runs at 3.6-3.7
So - massively muti-threaded apps runs super fast (2495 points Cinebench R15). Workloads with low number of threads (this includes also even most demanding games ;-) ) runs rather slow. Single-threaded Cinebench R15 - 120 points.
Switching off HT helps a little bit. It is easier to "force" computer to go into TB.
I use Argus Monitor, ThrottleStop, and Intel's own Tubo Boost monitoring app to watch current frequency.
There is ugly workaround to this problem. When i set in power management minimal cpu speed to 100%, problem disappears (single-threaded Cinebench R15 - 138 points). Computer power usage is 30W higher at idle though.
I have latest BIOS, latest drivers, latest Intel INF. EIST, Turbo are enabled in BIOS. Fiddling with NUMA, C1E, enabled C states, core parking makes no difference.
Any help would be appreciated.