The motherboard started not booting up with 4 dimms populated.

[theforce]

Last summer, I built a system for my friend's kid with the following specs:

Motherboard: MSI B550M RRO-VDH WIFI
RAM: Corsair Vengeance 16GB DDR4 3600 2x8GB
CPU: Ryzen 5700G

It has been working fine so far. I popped in another 2 sticks of RAM during the Xmas period and it booted fine the first time and for a few weeks. A few days ago, it started not posting with 4 dimms. I removed two RAM sticks and it worked fine so l updated to the latest version of the BIOS. It works fine with either set of RAM sticks but what is strange is that it was working ok for a couple of weeks and now all of a sudden it has started showing this non-booting up issue. Some more info, the issue happens with either XMP-1 or XMP-2 profile selected with 4 slots populated. What is also strange is that l don't get any sounds from the motherboard speaker when this happens. Speaker is working since it gives a beep code if l turn the system on with no RAM. Also there are no post LEDs showing up on the motherboard showing that something is wrong with the RAM.

 

[theforce]

The latest AGESA updates definitely improved things, what AGESA firmware are you running?

I am using the latest BIOS 7C95v2J, which uses AGESA ComboAm4v2PI 1.2.0.B.

The new set of RAM fails in memtest64 even when running at stock 2133Mhz after a few minutes. Tried upping the memory voltage to 1.4 to no avail. The old set has no issues running memtest64+ using X.M.P.

Seems like l will be returning the new set of RAM.

 

[theforce]

Two sets of two DIMMS. I was running CPUz which lists the timing information of each channel. I put the new set on RAM in slots 2 & 4 which are recommended slots for running two modules in duel-channel configuration and l was getting errors in memtest64 with XMP on and also with running at stock speeds of 2133MHz. I will try putting the suspected bad memory modules in my X570 system to verify that the issue persists and that it is indeed a defective module/s from the new pair.

Edit: I have tried the 4 RAM sticks in my system and they are working fine under xmp and they are not showing any errors in memtest64 after 2 hours of running. The 2x16GB modules l was using in my computer work fine with the B550M. I will keep the 4 modules in my system and just give him my RAM.