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On 12/08/2016 11:20 PM, Taiidan@gmx.com wrote:
I am wondering as to:
- Why 6274 cpu refuses to turbo to the second turbo state with half of
the cores in use (it stops around 100mhz before the first turbo state)
The CPU will not turbo to the highest frequency unless half the cores are in the CC6 power state. Have you verified that the CC6 power saving mode is enabled via nvramtool?
- Is it possible to force enable second turbo state for all cpu cores,
assuming adequate cooling? Or is it controlled on the CPU itself?
This is controlled by a black box on the CPU die itself. There is no way to override the settings of this black box unless you have an engineering sample (obtaining one at this point is illegal in at least the United States). We do have some experience overclocking the Opteron systems through other methods, but won't discuss further outside of a development contract.
Off topic but would rather not make another thread:
- Does NUMA ram alignment matter performance wise with only one physical
CPU? (RAM being split half and half per core set at the moment)
Yes! The G34 CPUs are actually two dies in one package, with 4 sticks of RAM attached to each node (making 8 sticks per package for the KGPE-D16).
- Does anyone know where I could get a reasonably priced 6287SE or
6284SE? or (even better) an engineering model of 62xx?
Those are rare chips and very expensive. See above for engineering samples; they're not legal here so I would have no idea.
I hope this helps!
- -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 (direct line) +1 (512) 690-0200 (switchboard) https://www.raptorengineering.com