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Old 10-20-2016, 11:43 PM
Laz322 Laz322 is offline
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Exclamation Trouble Overclocking with MSI Z170A Gaming M5 + Intel 6600K Processor


I've been having a damned difficult time trying to get a stable overclock with this motherboard (MSI Z170A Gaming M5) and the Intel Skylake 6600K. I know all overclocks are not the same and I understand that results may very depending on differences in hardware/cooling, etc. but I though the 6600K was easy to overclock and at relatively low voltages (I often read of people getting to 4.4GHz at a Vcore of 1.250v). I haven't been so luck yet and if I don't figure things out by tomorrow I will not be able to replace either the motherboard or the processor (if the fault lies with either one).

My target is 4.3ghz. At first I tried the recommend Vcore of 1.250v (at optimized default in the Bios as a starting point) with XMP disabled (just in case) and all power saving features turned off. I ran Prime95 on Blend and after two runs one of my cores stops working. The best I could do with Intel Burn Test (@4.2ghz) was to pass the standard test, if I tried the next setting up [High] the program would either shut down with a warning message or the computer would freeze up. I pass AIDA64's stability test without a problem, run a Cinebench CPU benchmark no problem, etc. I've had no luck with Intel's Extreme Tuning Utility (just for stress testing, not overclocking with it) and my memory passed four hours of the UEFI MemeTest86 without any errors.

Right now I'm at a Vcore of 1.300v in the Bios. I've set an Override Offset of 0.065mv to battle the voltage droop at load. The Ring is at 3900GHz, FCLK is at 1000GHz. The offset brings the Vcore up to 1.368v (though at idle the system Vcore in CPUID is 1.384, but I believe the values are slightly different on how the motherboard steps up each offset I set).

Ideally I'd like to get a lower Vcore at idle and find some way to battle voltage droop during load. I'm already heading towards the voltage limits for this chip (1.450v) and I haven't even got 4.3ghz OC stable!

There are other settings in the Bios dealing with voltage/delivery to the CPU that I do not fully understand and won't touch until I have, at the very least, a basic understanding of their function.

This board doesn't have LLC (Load-line-calibration) which was very surprising since it isn't a budget board and it was marketed for gamers and overclockers. MSI tech support (based out of California) is horrible. The phone "techs" know virtually nothing about the board and say if I want LCC I have to buy the more expensive M7 as they have no plans on ever updating the current Bios to add LLC.

Thanks for reading, I know it was a bit long.

Please help if you can,

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