AB350m - Ram Voltage unstable over stock

It could be that the board (or the CPUs memory controller) and RAM don't just work well together @ 1.35V for some odd reason. You'd probably need some other memory kit (from the memory QVL) to test if it's the combination of parts that's causing issues. By the way, are you sure you have the memory specs correct? Corsair's web page does not list any 4GB Vengeance memory under 2400MHz, only Corsair Value Select. Also, you've listed the chip number but not the product code for the memory kit, which would tell us if the memory is officially supported on this board.

I don't think I've even tested my RAM at stock and 1.35V. I've pretty much had the RAM overclocked from day one with 1.35V and have had no issues at lower speeds than the maximum I can use. My CPU voltage is currently set at 1.325V and all other voltages I've left at their stock values. I'm on BIOS version 3.3 since it has worked well so far. Are you using the latest 4.9 version or something else that's not 3.3?


Edited by PetrolHead - 30 Jul 2018 at 6:57am

CMK8GX4M2A2133C13 Specification:
- CPU Compatibility: Intel Haswell-E & Intel Skylake
- Chipset: Intel X99 / Z170
- Capacity: 8GB (4GBx2)
- Dual Channel kit: Yes
- Tested Speed: DDR4-2133 MHz (PC4-17000C13)
- Tested Latency: 13-15-15-28
- Tested Voltage: 1.2V
- Registered/Unbuffered: Unbuffered
- Error Checking: Non-ECC
- Type: 288-pin UDIMM
- SPD Speed: 2133 MHz
- SPD Voltage: 1.2V

Thank you for the product code. I found them now on Corsairs website and the specs check out; I must've made some mistake in my initial search. Also - as I feared - the memory is not on the memory QVL and thus is not supported. This is of course not the same as "it won't work", it just means that ASRock makes no promises and if you run into any sort of weird issues, they'll probably just tell you to get memory that is on the QVL. The chip number apparently refers to SK Hynix, so if it's A-die or M-die, then it should be nearly as good as Samsung B-die, but the rated speed is probably low for a reason. Higher speeds tend to require higher voltages than 1.2V, so maybe Corsair has saved on the power management components on the modules... Even so, it still sounds odd that they would be so sensitive that even 1.25V isn't stable. Aida64 isn't even that demanding compared to something like Prime95. Overall, I'd still probably lean towards it being the combination of it all: RAM modules that are sensitive to voltages and a motherboard and CPU combination that isn't too fond of the particular kit you have. Hopefully the new motherboard will give you a combination that will allow you to adjust the voltages more freely.