Question Memory errors when running 4x8Gb, good with 2x8Gb

[kkrizka]

Hello,

I’ve started to experience some issues (compiling large packages on Gentoo Linux) with my computer that could be compatible with failing memory. Running memtest86+ showed errors in the following two tests.

Test 6: Moving inversions, 64 bit pattern
Test 9: Modulo 20, random pattern

The PC is built out of the following parts:

CPU: AMD Risen 7 2700X
Motherboard: ROG STRIX X470-F GAMING (BIOS version 6232, latest)
Memory: G.SKILL TridentZ F4-3200C16Q-32GTZR

This worked fine for a long time, with the issue mentioned above only starting to occur a year back or so. But has gotten significantly worse recently, which is why I’m trying to identify which part is failing now.

I’ve tried running the memory sticks two at a time (tried all 4 in pairs of 2) in slots B2 and A2. This passes the memtest86+ without problems. The tests only fail if I plug in all four together. Since they work as “two at a time”, does this mean that the memory sticks are OK and the problem lies somewhere else?

The BIOS is using default settings for the memory. This sets it to 2133MHz with timings 15-15-15-36. I’ve also tried with DDR4-3200 CL16-18-18-38 using timings from the G.Skill page, but that fails even more memtest86+ tests.

There is also a peculiarity I’ve noticed in the motherboards’ QVL. The closest it lists is F4-3200C16Q-32GTZB (difference in the last letter, which might be significant difference). I’ve assumed they are compatible, since I’ve both them as part of a NewEgg combo in 2018. Also The G.Skill page does list them as compatible. Also I’ve noticed that the motherboard QVL does not have a tick in the “4 DIMM” column, even though this configuration requires 4x8Gb. Is it possible that the configuration I’m running in is just not compatible and it’s only starting to show with time?

Any idea what could be going wrong or what else I could check? The computer has been running fine otherwise, which is why I don’t want to rush to replace everything.

 

[COLGeek]

With all four slots occupied, you may need to manually adjust the memory voltage up a bit. Apply smallest possible increase until stable.

Fairly common for those older AMD chipsets.

 

[bill001g]

I am going to bet the last letter represent the color of the heatsink on the memory.

4 sticks of memory is always harder than 2 sticks. Your memory being on the QVL list in general means it "should" work. What is even more strange is that it does not even run at base DDR4 speed. You need to read the fine print and see what the actual rated speed is for your cpu/motherboard combination when running 4 sticks of memory.

In the end all you can do is mess with the settings until you get something stable. Or you just get frustrated testing stuff and buy a 2x 16 kit.

 

[geofelt]

Your ram kit should have a lifetime warranty.
Contact the ram guys at Corsair.
Since all worked before, I think the ram has started to fail and you should be able to get a RMA replacement.