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post #1 of 2 (permalink) Old 04-24-2019, 07:48 PM - Thread Starter
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msi z390 pro carbon

im running i9 9900k 5.2ghz all core at 1.36v im playing around with overclocking my memory and i would like to know what you guys think is safe voltage for vccsa and io i see alot of people who post they run very low voltage but i cant get my memory to be stable under 1.3volts at 4000mhz+ so right now sa is 1.36 and io 1.330 my last z270 board would auto 1.45sa and 1.4io with this same memory on auto, anyone think this is bad or doesnt really matter
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post #2 of 2 (permalink) Old 05-05-2019, 04:02 AM
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That is higher than it needs to be which is my educated guess. I have a similar motherboard that’s supposedly godlike but yeah you can try to change the mc, ring, sa and cpu pll from auto/0.9v (defaults) to 0.915 across the board for the four pll settings, and then lower your vccsa to 1.27-1.3 and vccio to 1.26-1.3.

I really don’t think you need more than 1.3v max unless you’re pushing 1CR at over 4600mhz with sub 17-17-17 timings. Again these are just my late night guesses but yeah you don’t need to be going north of 1.3v for sa or io for 98% of most people’s setups and their intended application.

For me what really helped my memory get stable is I changed my rxequalization to 31, and my ODT fine tuning to 14 (for both), as well as I disabled ram overboost/overvolt but I made sure I made my ram voltage a little higher, raising it from 1.41-1.42 to 1.43v.

FWIW I run my trident z non rgb 4266mhz c19-19-19-39 8gb x2 Kit on my msi z390 at 4460mhz c17-18-18-38-360 @ 1.43v and I consistently achieve being the 100th percentile in the ram category (all categories actually but ram is by far the hardest to achieve) on user benchmark dot com.

Good luck
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