MSI X670e Carbon WiFi code error Ab with EXPO on 4x48GB 5200

[MT-Studio]

Hi everyone,
I installed the latest AMI BIOS 7D70v18 2023-08-14 on my motherboard together with the Corsair 192gb (4x48gb) 5200 ddr5 ram kit (code CMK192GX5M4B5200C38).
The computer is equipped with a Ryzen 7950x processor and as soon as I activate A-XMP on the bios, when I restart it I always get the error code Ab with all 4 banks of RAM installed.
While if I install only 2 banks of RAM this code does not appear and the PC starts without problems by setting the RAM to 5200 in XMP mode.
Do you know how to solve this problem? Thanks in advance to everyone

 

[Alan J T]

That ram is not listed as Compatible with four sticks

 

[zerijelly]

The memory listed on the compatibility listed as 2 DIMM with 5200Mhz speed support.
You could update BIOS to the latest 7D70v18 and choose different memory with Memory Try It! in the BIOS/OC page.

 

[MT-Studio]

The memory listed on the compatibility listed as 2 DIMM with 5200Mhz speed support.
You could update BIOS to the latest 7D70v18 and choose different memory with Memory Try It! in the BIOS/OC page.
[/CITAZIONE]

Thanks, but if you read my post I already have that version of the bios

Excuse me, but maybe one thing isn't clear to me: you give a compatible product code which is a 192GB RAM (4x48GB) and then you tell me that it should be installed at 50%? so why enter this code and not the 2x48GB ram code? This motherboard apparently doesn't support any 4x48GB then like all the other boards do? I think it's quite absurd!!!

the problem is that in the technical specifications screen you give instead of the motherboard supporting 192GB... so if it's not possible from the compatibilities, then why do you indicate false data? I attach the photo of your info page.

 

[RemusM]

Hi everyone,
I installed the latest AMI BIOS 7D70v18 2023-08-14 on my motherboard together with the Corsair 192gb (4x48gb) 5200 ddr5 ram kit (code CMK192GX5M4B5200C38).
The computer is equipped with a Ryzen 7950x processor and as soon as I activate A-XMP on the bios, when I restart it I always get the error code Ab with all 4 banks of RAM installed.
While if I install only 2 banks of RAM this code does not appear and the PC starts without problems by setting the RAM to 5200 in XMP mode.

With the current AMD CPUs and the current VSOC limitation, 192GB at 5200 is gambling.
Here is what AMD guarantees for your CPU (and what you paid for):

 

[MT-Studio]

Your screen and post is from last year page and that isn't updated..
See this from asus... now?
if we have to follow your reasoning then MSI's specifications for 2x32GB are false because more than 5200 (according to AMD) these RAMs could not fit at 6000Mhz, and instead this is not the case because as you can see they are "certified" and run at 6000Mhz.

 

[RemusM]

if we have to follow your reasoning then MSI's specifications for 2x32GB are false because more than 5200 (according to AMD) these RAMs could not fit at 6000Mhz, and instead this is not the case because as you can see they are "certified" and run at 6000Mhz.

It's not my "reasoning", that's a fact from AMD.
You need to understand that the overclocking results are not guaranteed by anyone.
You need to understand that motherboard overclocking capabilities and CPU overclocking capabilities are 2 very different things.
You also need to understand the main rule: more memory you have, lower speed you'll get.
So you cannot compare 2 x 16GB with 4 x 16GB with 4 x 48GB.
For each case you have different voltages, timings and speeds.

The bottom line: if your 192GB kit runs stable at 3600 or 4000MHz, you don't have any issue.
If you want higher speeds, you're on your own.

 

[MT-Studio]

Maybe I wasn't clear:
- If MSI provides a compatibility list with speeds attached, any user refers to the MSI list.
- If instead MSI tells me that we have to refer to the processor compatibility data (data that dates back to a year ago on their page) then why provide a compatibility list complete with speed, positioning, etc. etc?

The words are clear for my part, and this doesn't seem like an absurd reasoning to me, rather it's about transparency and clarity: either you follow what AMD says or you follow what MSI says. In the first case then MSI would not provide truthful data if it then passes the buck.

Regarding the question in the previous post on the code provided, I was asking why a code was inserted for a 192GB (4x48GB) RAM saying that only 2 slots can be used out of the 4 when instead for the same RAM model the code directly exists 96GB (2x48GB). I don't think this is difficult to explain either.

practical example:
this "Kingston KF560C32RSK2-64 DDR5 6000Mhz SK hynix A 1.35 DUAL 32GB" ram takes up two slots and you write that they are COMPATIBLE FROM MSI PAGE X670E CARBON WIFI (since they are present in the list) and that they work at 6000Mhz. Your reasoning and what you write categorically excludes the fact that they can go at 6000Mhz given that AMD says that more than 5200Mhz doesn't work.
So... you understand that either MSI says the wrong thing, or it makes no sense to follow AMD's post from a year ago.

thanks in advance for all replies

 

[Alan J T]

Maybe I wasn't clear:
- If MSI provides a compatibility list with speeds attached, any user refers to the MSI list.
- If instead MSI tells me that we have to refer to the processor compatibility data (data that dates back to a year ago on their page) then why provide a compatibility list complete with speed, positioning, etc. etc?

The words are clear for my part, and this doesn't seem like an absurd reasoning to me, rather it's about transparency and clarity: either you follow what AMD says or you follow what MSI says. In the first case then MSI would not provide truthful data if it then passes the buck.

Regarding the question in the previous post on the code provided, I was asking why a code was inserted for a 192GB (4x48GB) RAM saying that only 2 slots can be used out of the 4 when instead for the same RAM model the code directly exists 96GB (2x48GB). I don't think this is difficult to explain either.

thanks in advance for all replies

Could ask @lostking20015bf02e6 I think they are running high compacity RAM on their board for assistance

 

[MT-Studio]

Could ask @lostking20015bf02e6 I think they are running high compacity RAM on their board for assistance

thank you so much.. i contact them

 

[RemusM]

practical example:
this "Kingston KF560C32RSK2-64 DDR5 6000Mhz SK hynix A 1.35 DUAL 32GB" ram takes up two slots and you write that they are COMPATIBLE FROM MSI PAGE X670E CARBON WIFI (since they are present in the list) and that they work at 6000Mhz. Your reasoning and what you write categorically excludes the fact that they can go at 6000Mhz given that AMD says that more than 5200Mhz doesn't work.
So... you understand that either MSI says the wrong thing, or it makes no sense to follow AMD's post from a year ago.

It's not an AMD one year old "post", but the current specs of your CPU.
AMD guaranteed speed means: 5200MHz at 1.1V for 2 memory modules and 3600MHz at 1.1V with 4 modules.
DDR5-6000 at 1.35V means overclocking (6000 > 5200) and overvolting (1.35V > 1.1V).
It has been tested by MSI to work on this motherboard.
But that does not mean that any CPU is able to run stable 64GB memory at 6000MHz with 1.35V
Some CPUs need more voltage, others need to decrease the memory speed, ... etc
This is the "gambling" part.
I hope it's clear enough now.

 

[MT-Studio]

but what a game of chance.. XMP or EXPO is default not a Russian roulette.
Your NOT answer is already an answer for me, so thanks for everything.

 

[RemusM]

XMP or EXPO is default not a Russian roulette

XMP and EXPO = overclocking and overvolting profiles.
Nothing is "default" and nothing is guaranteed here.
Higher the memory speed is, lower the chances to achieve stability you have.
On top of that: more memory you have, lower speed you'll be able to reach.

 

[RemusM]

For the Kingston fans:
https://www.kingston.com/unitedkingdom/en/memory/gaming/overclocking-education
"While generally safe and supported by Intel, AMD and the motherboard/system manufacturers, overclocking is done at your own risk.
System stability may be compromised by some speeds and configurations."

 

[MT-Studio]

Boy, don't make fun of me and don't make fun of all the people reading this post please.
If you have to cite a page you have to cite the entire text, not extrapolate just one part to look for a reason you don't have.
By doing so you offend all those who rely on what is written IN THE MOTHERBOARD COMPATIBILITY LIST.

On the page they write all this (perhaps useful for clarity) for all fans:
"Overclocking pushes the stable industry standard specifications of memory (speed, latencies, voltage) to achieve higher performance. While generally safe and supported by Intel, AMD and the motherboard/system manufacturers , overclocking is done at your own risk. System stability may be compromised by some speeds and configurations. The FURY parts listed are based on motherboard manufacturer testing (QVLs) and Kingston internal testing. However, some systems may require premium components (high-end processor models, motherboards, power supplies and water cooling) to achieve stable overclocking, particularly at extreme speeds."

I REPEAT LIKE A BROKEN RECORD THAT ALWAYS SAYS THE SAME THING:
MSI COMPATIBILITY LIST -> check model/serial present -> OK THIS MUST WORK AS MENTIONED.
the first question to understand whether the RAM works or not in the presence of errors from all sellers is: IS THE RAM CODE PRESENT IN THE COMPATIBILITY LIST WITH THE MOTHERBOARD?

Also
se mi dai il codice della ram CORSAIR CMK192GX5M4B5200C38 che è 4x48GB e mi dici che ne funzionano solo 2x48, allora non scrivi il codice esatto della ram 2x48 CMK96GX5M2B5200C38 visto che è l'unico modo in cui potrebbe funzionare ????

then if you want to explain to me what I should understand from this info on the specifications.. I would really appreciate it! ehehehe
4x DDR5, Maximum Memory Capacity 192GB, Memory Support DDR5 7800+(OC)/ 7600(OC)/ 7400(OC)/ 7200(OC)/ 7000(OC)/ 6800(OC)/ 6600(OC)/ 6400(OC)/ 6200(OC)/ 6000(OC)/ 5800(OC)/ 5600(OC)/ 5400(OC)/ 5200(OC)/ 5000(OC)/ 4800(JEDEC) MHz, Max. overclocking frequency: • 1DPC 1R Max speed up to 7800+ MHz • 1DPC 2R Max speed up to 6400+ MHz • 2DPC 1R Max speed up to 6400+ MHz • 2DPC 2R Max speed up to 5400+ MHz

dear regards

 

[RemusM]

I REPEAT LIKE A BROKEN RECORD THAT ALWAYS SAYS THE SAME THING:
MSI COMPATIBILITY LIST -> check model/serial present -> OK THIS MUST WORK AS MENTIONED.

That's false.
If the motherboard is capable to run a specific memory kit at the rated speed ("rated" = overclocking),
that does not mean any CPU sample is able to do that in any conditions.
So what works for some users, might not work for others.
Again, you need to understand that the overclocking results are not guaranteed (nothing is "default" here).

then if you want to explain to me what I should understand from this info on the specifications.. I would really appreciate it! ehehehe
4x DDR5, Maximum Memory Capacity 192GB, Memory Support DDR5 7800+(OC)/ 7600(OC)/ 7400(OC)/ 7200(OC)/ 7000(OC)/ 6800(OC)/ 6600(OC)/ 6400(OC)/ 6200(OC)/ 6000(OC)/ 5800(OC)/ 5600(OC)/ 5400(OC)/ 5200(OC)/ 5000(OC)/ 4800(JEDEC) MHz, Max. overclocking frequency: • 1DPC 1R Max speed up to 7800+ MHz • 1DPC 2R Max speed up to 6400+ MHz • 2DPC 1R Max speed up to 6400+ MHz • 2DPC 2R Max speed up to 5400+ MHz

You still don't understand the specs.
You cannot compare 4 x 16GB (some modules might be 2R here) with 4 x 32GB (all the modules are 2R here) with 4 x 48GB (everything is maxed out, a nightmare for CPU).
The max speeds in these 3 cases are different.
And again, you need to understand the basic rule: more memory you have, lower speed you'll get.

 

[MT-Studio]

I tell you about concrete data in hand and you respond by extrapolating pieces of information here and there that have nothing to do with my problem or with the problems or code errors indicated (product code in memory list compatibility).
If you have to answer because this way you earn points or something else from the msi portal, I invite you not to do so and let those who perhaps CAN and KNOW answer answer.
I thank you for the information you provided me, passing "from branch to branch" and I will treasure it.
See you soon, bye

 

[RemusM]

I tell you about concrete data in hand and you respond by extrapolating pieces of information here and there that have nothing to do with my problem or with the problems or code errors indicated (product code in memory list compatibility).
If you have to answer because this way you earn points or something else from the msi portal, I invite you not to do so and let those who perhaps CAN and KNOW answer answer.
I thank you for the information you provided me, passing "from branch to branch" and I will treasure it.
See you soon, bye

up to 5400MHz for 96GB or maybe 128GB.
Not for 192GB
bye

 

[badboy2k]

RAM Speed is more What can your CPU's IMC (MEMORY CONTROLLER) can do as it is the Primary thing that determines it the Board does not have a Memory Controller its the CPU if it cant do the speed at that capacity then nothing can change that as AMD only lists supported speeds of


Max Memory Speed:
2x1R DDR5-5200
2x2R DDR5-5200
4x1R DDR5-3600
4x2R DDR5-3600

beyond that your Gambling.

 

[MT-Studio]

@RemusM .. To underline the fact that you still don't know what you're talking about, and you answer so much to say things without knowledge of the facts or data in hand, I'll give you this information that I just tested:

• G.Skill Trident Z5 Neo RGB F5-6000J3040G32GX2-TZ5NR (present in list compatibility) memory module 64GB 2x32 GB DDR5 6000 MHz WORKS PERFECTLY in DEFAULT EXPO MODE (as indicated in list)!! your reasoning before said that more than 5200 can't go, or if they do it's lucky... are you sure?

I repeat once again, leave the answer to those who know things.. thank you!