B460M PRO-VDH WIFI crashing Windows 10 when using dual channel 32GB DRAM

brunoaduarte

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Hi,

I'm having issues with my MSI B460M PRO-VDH WIFI motherboard when using it with compatible (QVL) 32 GB DRAM memory sticks CMV32GX4M1A2666C18

If i put only 1 x 32GB memory stick on DIMMA2 slot (single channel), everything works fine.

But when i place the secondary memory stick (exact same model) on the DIMMB2 slot (2 x 32 GB = 64GB dual channel) the computer will load Win10 but will restart a few seconds later after logged on (random time).
There's no blue screen or nothing else, the pc just shutdown (cooler stops) and restart.

I've tried upgrading to the latest beta bios 7C83v151(Beta version) (2020-12-15), and also with the latest stable 7C83v14.

I've tried multiple memory configuration presets (including all the "Try it" templates for 2666 MHz memory).

I've tried switching slots, and also tried using the secondary memory slots DIMMA1 and DIMMB1.

The CPU i'm using is also on the QVL.
It's a Intel® Core™ i9-10900 Processor (BX8070110900)

How do i fix diagnose or fix this?
 

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Svet

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Are they matched pairs or 2 individual memory sticks?
Can you show SPD reading for each one of the sticks?
Have you tested 2nd memory stick alone in DIMMA2 slot?
 

brunoaduarte

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They are 2 individual memory sticks of the exact same model. I think this 32GB are not sold in pairs.

Here's a video showing the problem

I've attached some pictures of the memory sticks and also the SPD data you requested.

I've forced a lower ddram frequency in BIOS (1333 MHz instead of 2666 MHz) and the problem stopped.
Obviously this is just a test, as the pc lost a lot of performance and i can't keep using it this way.
 

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brunoaduarte

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Good (?) news.
I've forced the 2933 MHz preset on BIOS and now both memory sticks works perfectly together (overclocked it seems).
That does not make any sense as this is a 2666MHz DDR4.


UPDATE: THE PROBLEM PERSISTS. It just takes longer for the pc to restart. With the 2666MHz preset it takes a couple of seconds.
With the 2933MHz preset it takes up to 10 minutes.
 

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Svet

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Yes... both memory sticks works perfectly when used alone. I tested both on slots DIMMA2 and DIMMB2.
The problem only occurs when they are both used together.
Try reverse both memory stick places and retest. [exchange their positions in DIMM slots]
Use their stock speed (2666MHz)
If the issue is still there, try set memory timings manually and increase CAS value to 20 and retest.
 

brunoaduarte

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Try reverse both memory stick places and retest. [exchange their positions in DIMM slots]
Use their stock speed (2666MHz)
If the issue is still there, try set memory timings manually and increase CAS value to 20 and retest.
I've tried reversing the memory stick slots many times... nothing changes...

I've tested the way you suggested, 2666MHz with CAS manually set to 20, the problem persists (restart in seconds). I tried up to 30, nothing changes.

I've also tried manually setting ALL the timings of the 2933MHz profile, but with the 2666MHz frequency, and in that case the system won't boot (overclock fail message).
So i go slowly reverting the timings to the default of 2666, till it will stop giving the overclock error message, but when it finally boots, the restart problem persists.
 
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brunoaduarte

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I have 4 other memory modules of the same model (CMV32GX4M1A2666C18) here being used on another servers.
I've just tested them in this B460 MSI motherboard, and the problem is the same. I've tested in 2x32 GB (64GB) and 4x32GB (128GB) configurations.
All of these configs the pc keeps rebooting.

I also have a pair of 16GB Vengeance DDR4 modules
Single 1x16GB module works fine. Dual channel 2x16GB (32GB) reboots the PC...

And the 2 first 32GB modules i was trying are working perfectly on another motherboard (Asus TUF GAMIMG B460M PLUS).

So seems clear that the issue is not with the memory modules, they are perfect.

Do you think this motherboard is faulty?

Isn't there a tool that i can use to debug it more objectively?
 

vick1000

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Was there different memory in this board before? Reset CMOS and allow the board to relearn the RAM settings. Verifiy voltages with HWmonitor or similar, you may need some more VDIMM or VTT voltage. Do you have enhanced turbo disabled? Are you using a profile for the RAM?
 

brunoaduarte

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The problem was with the power source 🤦‍♂️
It's a brand new EVGA 400W Power Supply that came faulty. I've tested with my old one of the same model that i have here and the problem is gone.
The pc was not crashing, the power source was reseting when using more than 1 DDRAM module.
🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️
Sorry and thanks
 

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citay

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That PSU was a bottom of the barrel. Not even 80 PLUS White certified. Just two years of warranty. Cheaper than cheap. From what i could find online, it uses filtering capacitors from "Johnson Electric" and "ChengX" which are third-tier at best. And that's the main weak point of any cheap PSU, capacitors that go bad too quickly. Also, it is obviously very inefficient, not even making the 80 PLUS base standard.



All in all, a complete mismatch for a system with a Core i9-10900. Then again, your cheap mainboard is also sort of a mismatch for that CPU. And let's not get into using the Intel Boxed cooler for it, which forces you to fully constrict it to its power limits (probably even 65W after half a minute or so), meaning, there's quite a bit of performance left on the table this way... :)

For that nice CPU, i would get nothing less than a PSU with 80 PLUS Gold efficiency, 5 years of warranty or more, and maybe partly modular cables also come in handy. The 80 PLUS Gold certification ensures high-quality components, while the warranty period shows the confidence the manufacturer has in their product.

You seem to use integrated graphics, so around 500W is plenty. But the quality has to be there. You can't expect a 30-40 bucks PSU to provide stable power for a long time, they use cheap components. The PSU is the foundation of your entire system.

Some good models:
be quiet! Pure Power 11 CM
be quiet! Straight Power 11
Seasonic Core GM
Seasonic Focus PX
 
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vick1000

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If you are gonna skimp, there is a sale on at newegg...

,,,if you feel you need gold...
 
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