Help needed with B550 Tomahawk RAM / XMP

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Hi,
I recently built a new system with the following specs:
  • Ryzen 5 5600X
  • MSI MAG B550 Tomahawk
  • Corsair Vengeance LPX 2 x 16 GB 3600 MHz CL18 (CMK32GX4M2Z3600C18)
  • MSI Radeon RX 6800 Gaming X Trio
  • be quiet! Dark Power 12 850W
After putting everything together and booting into UEFI for the first time I casually enabled XMP. After that the machine wouldn't post, the DRAM error led was on and I had to reset the CMOS.
Some people suggested it could be the 5600X memory controller which officially supports only up to 3200 MHz. But I should also note that the motherboard shipped with a very old BIOS and I have now updated it to 7C91vA8
My RAM is currently running at 2666 MHz (plug'n'play) which is acceptable as I'm not into RAM overclocking or trying to squeeze out every last bit of performance. But I wouldn't like to leave too much on the table either. Do you think it could have been a BIOS issue and should I try XMP again with the new BIOS? I have also received a couple of suggestions to enable XMP and then manually set the DRAM frequency to 3200 and FCLK to 1600. Could this work?
I also read about Memory Try It! in the manual. Is it a reliable feature? I like the idea of being able to revert to previous settings without resetting CMOS, since getting access to the reset pins involves removing the huge GPU along with its anti-sag bracket and it's a lot of work.
 

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Hi,
I recently built a new system with the following specs:
  • Ryzen 5 5600X
  • MSI MAG B550 Tomahawk
  • Corsair Vengeance LPX 2 x 16 GB 3600 MHz CL18 (CMK32GX4M2Z3600C18)
  • MSI Radeon RX 6800 Gaming X Trio
  • be quiet! Dark Power 12 850W
After putting everything together and booting into UEFI for the first time I casually enabled XMP. After that the machine wouldn't post, the DRAM error led was on and I had to reset the CMOS.
Some people suggested it could be the 5600X memory controller which officially supports only up to 3200 MHz. But I should also note that the motherboard shipped with a very old BIOS and I have now updated it to 7C91vA8
My RAM is currently running at 2666 MHz (plug'n'play) which is acceptable as I'm not into RAM overclocking or trying to squeeze out every last bit of performance. But I wouldn't like to leave too much on the table either. Do you think it could have been a BIOS issue and should I try XMP again with the new BIOS? I have also received a couple of suggestions to enable XMP and then manually set the DRAM frequency to 3200 and FCLK to 1600. Could this work?
I also read about Memory Try It! in the manual. Is it a reliable feature? I like the idea of being able to revert to previous settings without resetting CMOS, since getting access to the reset pins involves removing the huge GPU along with its anti-sag bracket and it's a lot of work.
Can you use M-Flash in the bios and try BIOS version 7C91vA7 AGESA 1.2.0.3b see if this will help with your RAM

You can also try a 3200 setting manually

Only need to change a couple of settings rest can stay on auto
mem.jpg

Mem2.jpg
 

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Hi,

Thanks for replying.

Just to confirm, are you suggesting I should downgrade to an older BIOS version? I'm currently on 7C91vA8 and haven't touched any RAM settings after updating. Are there known problems with this version?

Also, if I change only the clock speeds and voltage manually, without first enabling XMP, I would retain the default timings. Could that be a problem?
 
Last edited:

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Hi,

Thanks for replying.

Just to confirm, are you suggesting I should downgrade to an older BIOS version? I'm currently on 7C91vA8 and haven't touched any RAM settings after updating. Are there known problems with this version?

Also, if I change only the clock speeds and voltage manually, without first enabling XMP, I would retain the default timings. Could that be a problem?
PC will find normally find the ram timings it needs

Try A-XMP with the older BIOS first and if it still fails to post reset Cmos and try 3200 with ram timings on AUTO

And yes I am suggesting you downgrade your BIOS as 1.2.0.5 has been reported in forums as buggy on some builds with B550 and X590 chipsets
 

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Thanks for clearing that up. I'll try this when I have enough time time to tinker around...

Anything special I should take into consideration when downgrading to an earlier BIOS?
 

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Thanks for clearing that up. I'll try this when I have enough time time to tinker around...

Anything special I should take into consideration when downgrading to an earlier BIOS?
No is just like doing a Bios update.
 

stormy1352

Active member
CORPORAL
Joined
Sep 4, 2017
Messages
178
Not that it necessarily helps but,

cpuid.png


and been like that with zero problems for over a year.
 

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Not that it necessarily helps but,



and been like that with zero problems for over a year.
From what I have seen in post and PC specks it is 32GB and over with the problem and 1.2.0.5 has not been out for year but just over a month.
Once I managed to get mine to post with with 1.2.0.5 it has been OK but getting it to post was somewhat problematic requiring several Cmos resets.
 

stormy1352

Active member
CORPORAL
Joined
Sep 4, 2017
Messages
178
Not the bios but the RAM speed. And didn't have any of those problems when I updated to 1.2.0.5, installed redid my settings and be rock solid ever since.
 

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Ok. Thanks for your help. I'll be testing all this when I have the time. :)
Hi can you supply a screenshot of the sticker on your Memory please you can blackout the last 6 digit on serial if you want to it should look a bit like this
Make sure to reply to this post please so I know you have left a message
mem sticker.jpg
 

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Hi can you supply a screenshot of the sticker on your Memory please you can blackout the last 6 digit on serial if you want to it should look a bit like this
Make sure to reply to this post please so I know you have left a message
View attachment 156309
Hi,

Is the information you are looking for something that can be dug up with software or is it something you absolutely need from the sticker?

I'm currently running the RAM at 3200 MHz with FCLK at 1600 MHz like you suggested but I took the timings and voltage from XMP profile 2. Everything has been working fine. Still haven't tried 3600 though.
I didn't mention this earlier but I bought the CPU used (the only second-hand part in this build). I recently contacted the seller to ask if he had issues with RAM. He said he never had problems running a 2 x 16 3600 MHz CL18 Corsair Vengeance kit with XMP on, so I think that rules out the CPU and the memory controller. Not all RAM is the same of course but I'm sure the memory controller could handle 1800 MHz.
 

Alan J T

🙈 🙉🐝 🤬😈
Global Moderator
Joined
Sep 11, 2020
Messages
7,803
Hi,

Is the information you are looking for something that can be dug up with software or is it something you absolutely need from the sticker?

I'm currently running the RAM at 3200 MHz with FCLK at 1600 MHz like you suggested but I took the timings and voltage from XMP profile 2. Everything has been working fine. Still haven't tried 3600 though.
I didn't mention this earlier but I bought the CPU used (the only second-hand part in this build). I recently contacted the seller to ask if he had issues with RAM. He said he never had problems running a 2 x 16 3600 MHz CL18 Corsair Vengeance kit with XMP on, so I think that rules out the CPU and the memory controller. Not all RAM is the same of course but I'm sure the memory controller could handle 1800 MHz.
Apparently is what they need to see. but if it is to hard to get to CPU-Z may be enough
I have to remove my CPU cooler to get to my RAM and that is after I dig out the PC from behind the TV and i'm out of Thermal paste so will have to order that first.
So ya CPU-Z screenshots sure would be easier, along with a Validation link like this one https://valid.x86.fr/dtgeip

Screen shot like this may just be enough
Screenshot 2022-01-28 215141.jpg
 

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Apparently is what they need to see. but if it is to hard to get to CPU-Z may be enough
I have to remove my CPU cooler to get to my RAM and that is after I dig out the PC from behind the TV and i'm out of Thermal paste so will have to order that first.
So ya CPU-Z screenshots sure would be easier, along with a Validation link like this one https://valid.x86.fr/dtgeip
That I can do. :)
cpu-z_CPU.png
cpu-z_mobo.png

cpu-z_RAM.png
cpu-z_SPD.png


Validation here: https://valid.x86.fr/s58jgm
If you really need the sticker info, I think I might be able to see the other one just by opening the side panel so I can stick my phone inside and snap a photo since the stickers are facing towards the front of the case.
 

ku12b302b0

New member
Joined
Jan 22, 2022
Messages
9
Sorry about the double post, I was trying to edit the first one to include a quote but apparently that's just not how this forum works.
 
Top