Weird memory issue with MSI Mortar B450M

steverob106156f02de

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I've had this board just over a year and originally installed 8GB DDR4-2666 UDIMM (1.2V CL19) from Crucial. It's worked fine, no problems
Now I've decided to up the RAM and bought one more of the same from the same vendor on Amazon. The first stick didn't work so I put that down to a random problem, sent it back and received a replacement but now the second doesn't work either. Two sticks of RAM with the same spec as the original but neither of them allow the board to boot.
FTAOD - I've replaced the original stick with the new sticks one by one - so the only thing that's changed is the RAM.
So the possibilities are:
  • - I've been very lucky with the first stick and it was the wrong spec to begin with, or
  • - the two sticks from the same vendor are now a different spec or
  • - they're both faulty.
None of this sounds very feasible. Any thoughts or experience?
 

badboy2k

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I've had this board just over a year and originally installed 8GB DDR4-2666 UDIMM (1.2V CL19) from Crucial. It's worked fine, no problems
Now I've decided to up the RAM and bought one more of the same from the same vendor on Amazon. The first stick didn't work so I put that down to a random problem, sent it back and received a replacement but now the second doesn't work either. Two sticks of RAM with the same spec as the original but neither of them allow the board to boot.
FTAOD - I've replaced the original stick with the new sticks one by one - so the only thing that's changed is the RAM.
So the possibilities are:
  • - I've been very lucky with the first stick and it was the wrong spec to begin with, or
  • - the two sticks from the same vendor are now a different spec or
  • - they're both faulty.
None of this sounds very feasible. Any thoughts or experience?
the two sticks from the same vendor are now a different spec <-- that is what will be going on

RAM Manufacturers change the Chips they use on the DIMMS very often like they may go from Samsung to Micron RAM Chips and even if the the same people they get the chips off they can change the specs of them too (they may look the same spec wise but the underlying timings and clock signals can be highly Different) its what is called RAM Mixing and puts an abnormal Strain on A CPU's IMC (Memory Controller) and can make it just say nope i am not even attempting that and just throw an ERROR.
 

steverob106156f02de

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Thanks - that's helpful. Never had this problem with RAM before: how do I find compatible memory? AFAIK I'm using memory that MSI says should work. And the board wouldn't boot with just ONE stick in place, so there wasn't mixing going on.
 

badboy2k

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Thanks - that's helpful. Never had this problem with RAM before: how do I find compatible memory? AFAIK I'm using memory that MSI says should work. And the board wouldn't boot with just ONE stick in place, so there wasn't mixing going on.
before you do anything can you do one thing first. can you test your known working one in each of the 4 RAM slots to make sure they all actually work?

https://www.msi.com/Motherboard/B450M-MORTAR/support#support-main-block-qvl that is the known working parts. <-- Pick the memory for what CPU you have and i would suggest if you want 2 sticks for Dual Channel to buy a 2 stick Kit as they have been tested to work together as buying individual ones is a 50/50 of it may work or may be exactly what you have now where its refusing.
 

Alan J T

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Thanks - that's helpful. Never had this problem with RAM before: how do I find compatible memory? AFAIK I'm using memory that MSI says should work.
Most times you Buy as a set of two can you return the one you got for refund,
Look at getting a Matched set of RAM
Most times a matched set of 3200 CL16 Ram works well in a 16GB kit with 2x8GB Modules

Can you also list rest of build>>Posting Guide<<
 

badboy2k

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Just had a look at the UEFI - memory voltage is showing 1.36V but the stick says 1.2V - is this the problem?
usually the rating on the stick is the JDEC Rating and all DDR4 is 1.2V but can handle upto 1.5V so your in the Middle and most RAM in XMP will run Around 1.35v to 1.36V so all seems 100% normal
 

steverob106156f02de

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Just reset the memory voltage to 1.2V but still no joy. FTAOD: the motherboard starts to do something but there's no display from the HDMI ports, either onboard or from my graphics card. The new and old memory sticks have almost identical labels, but only the old one works while the new one doesn't. We're not even in the realm of getting two to work together - this is just about getting one stick to work, and seems strange that two brand new sticks had the same issue.
 

mdfx

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Mortar B450M has 4 memory sockets (A1 A2 B1 B2), make sure you using them in the right order: A2-B2 A1-B1 (the population order is printed on the board itself near the dimm slots)
If you using two "kinda identical" memory sticks in A2-B2 and the system for some reason doesn't boot (or has some other issues) despite you're absolutely sure that at least one module is ok then you could try to swap the old and new modules in slots (put new one in A2, old one in B2). This worked for me few times.
Also, all the manipulations work better with default BIOS settings. You can try XMP and other stuff after getting rid of the boot issue.
 

steverob106156f02de

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These are supposedly identical memory sticks: they both have the same code on the label: Crucial CT8G4DFRA266. They both say they're 8GB DDR4-2666 UDIMM 1.2V CL19. As far as I can tell, they're identical, except for where they were manufactured. The old one works - the mobo boots and all is well with the world. I replace the stick with a new one in the same slot, and although something's happening, no video output, so no clue as to what the problem is. This happened with my first new stick and so I assumed it was faulty and sent it back. But the replacement is also behaving the same way.
 

eqwebbie_with_PC

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Hi,
what BIOS version do you use? AMD fiddled with RAM compatibility in 2021 a lot; so there is a chance it will work better with the latest BIOS.
What CPU do you use? Not all CPUs support all memory settings. What PSU do you use? Is it strong enough for 2 RAM modules?
We know nothing about your system; this makes it hard to answer. ;) Alan posted in #5 the posting guide; there you can see how to post your config.
Good luck! :)
 
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steverob106156f02de

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Thanks - FTAOD: there are not two RAM modules yet: I just replaced last year's RAM card which works fine with the new one in the same slot and the system doesn't boot. It's the second new stick bought from Crucial - the first one did the same. They are the same model number.


Motherboard: MSI Mortar B450M
Processor: AMD Ryzen 3 3100
RAM: Crucial CT8G4DFRA266 8GB DDR4-2666 UDIMM 1.2V CL19
PSU: 450W generic ATX
BIOS: E7B89AMS.280 - build date 6/10/20
 
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citay

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You actually have the B450M Mortar Max, judging by the BIOS version, https://www.msi.com/Motherboard/B450M-MORTAR-MAX/support#down-bios

Update to BIOS 7B89v2D using only the old RAM module:
1) Download the BIOS.
2) Extract the file and you will get a text file and the BIOS file. Put the BIOS file into the root folder of a USB stick/drive.
3) Enter the BIOS by pressing DEL during boot, go to "M-FLASH" in the BIOS.
4) Once M-Flash (the updater) is loaded, it will show a list of your drives. Select the USB stick and select the previously extracted BIOS file on there.
5) It will ask for confirmation and then update the BIOS. It's fully automatic from there, takes about two minutes.

Test again with the modules in slots A2 and B2 (second and forth from the left). If it doesn't even want to boot, scrap the plan of getting these modules working together.
It is very low-performing RAM anyway (CL19 at DDR4-2666, horrendously slow timings). Instead, return the newly bought module, and put your existing module to the side or sell it otherwise.
Get a matching kit of 2x 8GB DDR4-3200 for example, a popular kit from a popular brand like Crucial or G.Skill.
This is almost guaranteed to work, and once you enable A-XMP in the BIOS, will also improve memory performance a lot.
 

steverob106156f02de

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Thanks for all the advice. Crucial responded to say try resetting the CMOS, and so did MSI tech support, so I'll try that first and let you know if it works.
 

citay

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Yeah, that's worth a shot. Remember, you have to get it working in slots A2 and B2, for dual-channel operation in the correct slots. If it doesn't want to work properly like that, not even with the newest BIOS, then you have to abandon this route and just get a matched kit of RAM like me and others have suggested. As a bonus, that will also perform much better than the slow modules you have now.
 

steverob106156f02de

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Thanks for all the suggestions and ideas. It turns out that resetting CMOS fixed the issue. I took out the battery, shorted the connections and replaced it. The new memory stick is now recognised and the system boots. I've added both modules in and they're working together fine. In years of messing about with memory I've never had to reset the CMOS but, hey, you live and learn...
 

citay

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In this case, updating the BIOS like i've originally suggested would've done the trick as well. About the CMOS Clear: You can do it by either taking out the battery or by shorting the JBAT1 pins on the board, you don't have to do both, but it doesn't hurt either. Make sure the modules are in the second and fourth slot from the left now (A2 and B2).
 

steverob106156f02de

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In this case, updating the BIOS like i've originally suggested would've done the trick as well. About the CMOS Clear: You can do it by either taking out the battery or by shorting the JBAT1 pins on the board, you don't have to do both, but it doesn't hurt either. Make sure the modules are in the second and fourth slot from the left now (A2 and B2).
Yep - took the battery out and shorted the terminals :)
 
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