BIOS Options for OCing: EIST, Intel Turbo Boost, Enhanced Turbo

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8 May 2008
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Essex
I got myself parts for a new rig.
MSI X99S SLI Plus - TeamGroup 16GB 2400MHz DDR4 Intel X99 Motherboard Bundle + 5820K + Corsair 105H

Not sure I have applied the thermal paste properly after cutting bits out of my Case to fit the H105:)
CPU OCed to 4.2Ghz at 1.160v and RAM to 2666Ghz with same timings as 2400 at 1.3v and they seem to be fine. RAM have dedicated fans on them.
CPU Idle is around 28 with benchmark (Prime or OCCT) steady at 61 ± 2 degrees.

My question and sorry if others have asked but could not find the answer is about the BIOS settings, mosre specifically the CPU settings:
  1. EIST
  2. Intel Turbo Boost
  3. Enhanced Turbo

I kinda gathered what they do by googling around but still couldn't find a straight answer, I just have an idea. I would like to know the impact on OCing.

If I set the BIOS settings speed as FIXED the CPU is running at full blast all the time with temps around 38/40. If I set the settings as Dynamic Mode with all of the above enabled the CPU is sitting at 1.2Ghz idling at 28 degrees and boosting to 4.2Ghz when needed. The CPU voltage seems to stay as I set it at 1.158 regardless if it is 1.2Ghs or 4.2Ghz which I think is OK as one of the issues would have been the auto voltage which would screw up the OCing.

If I disable EIST but leave the other 2 settings on the Cores fluctuate (as in 1 core is at 1.2 the other is at 4.2, one up one down) between 1.2 and 4.2, after it goes through a benchmark all cores seem to stay at 4.2 and not fluctuate.

I would like to use the optimal settings, any feedback is much appreciated
 
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That's great mate much appreciated. I will do a proper test using FIXED settings and then change them to yours as I prefer to have the CPU having a rest when not gaming.

I did have an issue with OCCT, seemed to fail after about 2 minutes but no indication why, I couldn't understand the screen-shots it creates. I might need to up the v to 1.2. However I was playing Heroes of the Storm and never had any crashes or issues.

Which stress test app would you recommend? I haven't really used Prime in some time but last time it was suggested 8 hours and as per above OCCT seems rather temperamental.


P.S. Related to Heroes of the Storm I have 4 beta keys, happy to give them away to OCUK users as I don't know anyone else that wants them. Mr Danny75 since you were the first to help me out here, if you want 1 or more for friends let me know.
 
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