6850k not reaching maximum clock

[Spork_Hero]

Hello, I recently got a 6850k, however, it never reaches maximum clock during certain operations, it is currently stable at 4.4ghz.  That being said, if I run Aida64's FPU test, the multiplier only goes up to 4.1ghz at max, while temperatures are in the high 40s and low 50s, that being said, if I do a simple CPU stress test, I can get 4.4ghz.  Unfortunately, I do a considerable amount of rendering, while rendering video, I only reach 4.1ghz again.  My friend has a 5820k and he does not run into this issue so I am curious what is going on.

 

For other information my build is as such:

EVGA x99 Classified

Intel 6850k (Water cooled twin 140mm fans)

EVGA 1200 watt PSU

2 x Nvidia 980ti

950 nvme drive 512 GB

850 pro 512 GB

an assortment of other disk based drives for archived storage

 

Any help is greatly appreciated,

Sincerely,

Jake

[haloslayer875]

Are you running an XMP profile as this can increase the CPU strap and may result in weird overclocks. Also, check with EVGA and see if there is a UEFI or BIOS update. Broadwell-e is still new enough that not all bugs may have been worked out. I use a 6850k myself and I have mine at 4.5hgz on a 360 rad.

[Spork_Hero]

Sorry, for the late reply, I have updated the UEFI with little effect, mine is running on a 280 rad, temperatures are completely stable at around 65 C under full load, it is just strange, in certain tasks, I only get 4.2 GHz, to be more specific, when trans coding video, I was able to get it up from 4.1 to 4.3 by increasing the multiplier to 4.6.  Everything is completely stable at these speeds.  When I play a game, it should be noted, I receive the full 4.6 GHz, however, I am still curious why I am not getting the full performance.  There is no down clocking, I have checked with AIDA, there does not seem to be a problem, it appears to be a strange problem.  I should note that I am trans coding with Plex, I am aware that it is not the best trans coder, however, I stream from it, so I wanted to optimize everything so that there would not need to be any on the fly trans coding when I request a video from a foreign location.

 

I hope this more detailed information helped.

Sincerely,
Jake

[Spork_Hero]

Sorry, for the late reply, I have updated the UEFI with little effect, mine is running on a 280 rad, temperatures are completely stable at around 65 C under full load, it is just strange, in certain tasks, I only get 4.2 GHz, to be more specific, when trans coding video, I was able to get it up from 4.1 to 4.3 by increasing the multiplier to 4.6.  Everything is completely stable at these speeds.  When I play a game, it should be noted, I receive the full 4.6 GHz, however, I am still curious why I am not getting the full performance.  There is no down clocking, I have checked with AIDA, there does not seem to be a problem, it appears to be a strange problem.  I should note that I am trans coding with Plex, I am aware that it is not the best trans coder, however, I stream from it, so I wanted to optimize everything so that there would not need to be any on the fly trans coding when I request a video from a foreign location.

 

I hope this more detailed information helped.

Sincerely,
Jake

[Spork_Hero]

Sorry for the double post, my computer has a mind of its own sometimes :P+

[done12many2]

I bet you're running an AVX offset.

 

Broadwell-E has the ability to scale down clock multiplier during AVX loads.  Really nice feature if you ask me.  There is something possibly labeled "AVX offset" or something similar in BIOS/UEFI.   Make sure you set that to 0, disabled or whatever is appropriate for your needs.

 

Certain benchmarks/stress tests don'e use AVX.  Others do, which would explain your inconsistency with seeing the "problem."  Same applies to encoding/transcoding work loads.

 

Let me know if that helps and congrats on the new rig/overclock.