PC / PSU Shutdown during Memtest. No warning / event log

[Erasius]

Hello, last year I build my PC and noticed that my PC often shuts down without warning whenever using ZBrush, and I have to turn off/on my PSU to boot again. 
Now I thought I had fixed the issue by changing my RAM voltages from auto to 1.35v . Which worked for a while but recently it shuts down again without any warning or event log other than it didn’t shut down properly. It’s difficult to simulate the problem in ZBrush ( which only utilizes RAM+CPU ) so I figured I’d try a bunch of Memtest 64 to stress test my RAM and *poof* it shuts down after 1-2 hours whenever I use 95-98% memory or instantly at 100%. I never have any problems when playing games or running heaven benchmark. Updating my Bios to the latest version also didn’t help.

Any idea what could be the problem? My guess is motherboard or RAM ?

Not sure what to do, I think I might have to buy new dimms to test it but before I do i’d like to know your thoughts on the issue.

Build:

Asus ROG STRIX B550 - A Gaming ( BIOS version 2803 )
AMD Ryzen 7 5900x

EVGA NVIDIA RTX 3080 TI FTW 3 Ultra
G.Skill DDR4 Trident-Z 32GB (2x16) 3600Mhz RGB F4-3600C16-16GTZNC

Corsair RM850X - 850 watt
Samsung 980 pro m.2 1TB
 

 

 

[TwilightRavens]

It sounds like either your RAM or fclk is unstable, but RAM will usually throw a bsod.

[Sjaakie]

Does it run normally with the memory at stock speed?

[LoXodonte]

can you just remove one stick of memory and run your test again, then alternate to isolate, or do they require a bank

[Erasius]

Sorry for the late reply, I’ve tested the dimms in a couple of configurations with a memtest and these were the results:

[ Dual channel ] 
2133 Mhz 1.2v [Auto] - Shutdown within 2-5 min
3600 Mhz 1.35v [DOCP] - Shutdown after 2 hours

[ Single Channel Dimm 1 ]
2133 Mhz 1.2 [Auto] - Pass, no issues for 2 hours
3600 Mhz 1.35 [DOCP] - Pass, no issues for 2 hours

[ Single Channel Dimm 2 ]

2133 Mhz 1.2 [Auto] - Pass, no issues for 2 hours
3600 Mhz 1.35v [DOCP] - Pass, no issues for 2 hours

Any idea why dual channel is causing the issue ? And why it is less stable on stock 2133 Mhz compared to 3600 Mhz DOCP ?

I’ve ordered some new dimms of the same series which I’m planning to test in dual channel to see if is just the ram itself that is unstable , but before I try them do you have any idea what else might be the problem ?
 

[SamClan]

8 hours ago, Erasius said:

Sorry for the late reply, I’ve tested the dimms in a couple of configurations with a memtest and these were the results:

[ Dual channel ] 
2133 Mhz 1.2v [Auto] - Shutdown within 2-5 min
3600 Mhz 1.35v [DOCP] - Shutdown after 2 hours

[ Single Channel Dimm 1 ]
2133 Mhz 1.2 [Auto] - Pass, no issues for 2 hours
3600 Mhz 1.35 [DOCP] - Pass, no issues for 2 hours

[ Single Channel Dimm 2 ]

2133 Mhz 1.2 [Auto] - Pass, no issues for 2 hours
3600 Mhz 1.35v [DOCP] - Pass, no issues for 2 hours

Any idea why dual channel is causing the issue ? And why it is less stable on stock 2133 Mhz compared to 3600 Mhz DOCP ?

I’ve ordered some new dimms of the same series which I’m planning to test in dual channel to see if is just the ram itself that is unstable , but before I try them do you have any idea what else might be the problem ?
 

You have 4 ram slots where have you plugged your ram into 

A1 A2 B1 B2? 

 

 

[Erasius]

I’ve tested B2 and A2 both in single and duo config

[Erasius]

Just got my new dimms , same G skill set as before and on auto at 2133 Mhz it is stable after 1.5-2 hour mem test using slot A2 and B2 , last test is gonna be at 3600 Mhz DOCP if that works than I think that it the previous dimms weren’t stable in dual channel for whatever strange reason.

[Erasius]

new dimms also passed 2 hour stress test at 3600 Mhz DOCP so I think the issue is resolved. If I happen to have another shut down during the comming weeks I’ll update this thread. Thnx for the help.

[Erasius]

Update: 

PSU caused the problem, I've changed it to a 1000W power supply and it has been running without any issues for months now.

Edited August 9, 2023 by Erasius
Solution