My new build isn't performing like it should (i7-6800k)

[tmorgan4]

*I just tried to post as a guest and can't find the thread anywhere. Trying again as a registered user*

I just built a new system last week and I'm seeing some weird things. It's was built to run heavy multi-core computing applications (sometimes 24x7) so I was planning to a slight overclock as stability is critical. The main computing application I've tested with supports multi-core computing but does not support hyperthreading so HT is switched off in the BIOS.

Even at factory settings I don't think it's offering the performance that it should. I'm running a Corsair 100i v2 liquid cooler but don't seem temperatures over 36*C after sitting at 100% CPU on all 6 cores for 24 hours. Power consumption is very low compared to published values as well (~65 watts at full load).

Setup:
Intel i7-6800k
Asus X99-A II Motherboard
32GB DDR4 Corsair Ram
500W EVGA 500B Power Supply
Crucial SSD
Win7 x64

Oddly, after going through the ASUS 5-Way optimization which applies a slight overclock my application only uses 20-40% CPU (core 2 goes to 100% and minor activity is seen on all others)
where with default settings all cores sit at 100%. What is keeping all cores from being used?

Here's a screenshot showing CPU activity, voltage, and temperatures after running for 24 hours. If any other information is needed feel free to ask. Thanks in advance!

 

[Paul NZ]

OC and stability shouldn't be in the same sentence. If you OC, it can crash

Disable Speedstep / update the BIOS

 

[tmorgan4]

Thanks Paul.

I disabled Speedstep in the BIOS. CPU power increased from ~76W to ~90W and temps are a few degrees hotter but still nowhere near the 140W published on Intel's datasheet.

BIOS are version 1401 which should be the latest version.

Any other ideas?

 

[Paul NZ]

Thats the latest version of the BIOS

Does it matter what the datasheet says? No

 

[tmorgan4]

Thanks Paul.

I was under the impression the data sheets should be very accurate and power consumption was a good measure of how hard things were being pushed. I expected more from the 6800k as it's only running my simulations about 30% faster than my MSI GS60 Ghost laptop with a i7-4710HQ. Was hoping there was some setting or driver that was holding it back as it doesn't seem to be as fast as it should.