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bios Problems with expo and 4 ddr modules 5 KF660C36BBEK2-64

ramonramonram
Level 7

cpu : amd ryzen 7950x

memory: 4 modules KF660C36BBEK2-64 (compatible with mb)

geforce rtx 4080

PSU: 850W

The truth is that I am very discouraged with ASUS and the bios they provide for rog strix x670e-e gaming wifi. I have tried several modules, all of them compatible and when I connect the 4 modules to obtain the 128GB, when I activate expo and recognizing the modules correctly (6000Mhz) the system does not start and the bios crashes. When I leave only 2 modules in the proper position, the system works correctly. If the memory is completely compatible, does that mean that Asus doesn't do adequate testing to recommend the modules? Can someone help me solve this problem?

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10 REPLIES 10

WarCrysisi
Level 7

I have not had this issue for years. PRE 400 series AM4 boards all the way back to socket 939 I had issues with memory from time to time. AM4 it was mostly trying to get to 3200 lol. the OG AM4 CPU's kind of sucked for memory. Even Zen + - Zen 3 was rough. 

Lets try dual channel, only two sticks at 6000 Mhz. leave A2 and B2 empty. 

DDR5 is tricky and AMD doesn't make the situation any better. 6000 is the best you can get on a single dim. Maybe 6200.. on Ryzen 7xxx. Mean while intel systems are running dual channel 8600 mhz. 

 

Okay so if this works, it means the classic " cant run 4 Dimms at rated OC " situation. Not uncommon on AMD boards. Mostly a CPU issue. Zen 5 chips later this year will likely support upto 6600 or even higher and might even run that across 4 dimms. 

 

So what I would do if it does work fine with two Dimms is lower the frequency to say 5800 with all 4 installed. see if it works and is stable. Mostly this is likely an AMD issue. unless you can verify 4x Dimms work at rated OC (Which is what EXPO and XMP are, that is not 6000mhz ram, they don't make 6000mhz ram. they make 4800 and then OC it). 

If solid memory compatibility is what you are after, Intel has a better memory controller than AMD. but that socket is about to be replaced. 

Let us know what happens

Silent_Scone
Super Moderator

Hi @ramonramonram 

Please read the article here and look specifically at the section regarding combining memory kits. Any questions please add to the thread here.

Memory Kits & Overclocking 

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

ramonramonram
Level 7

Thanks for the answers. I have read them carefully. The problem is basic. Asus cannot advertise that a motherboard supports speeds of up to 8000Mhz and 192GB when it tries to sell you the motherboard and then have to review the fine print and see the reality, which is nothing other than not true. Under the previous parameters, what was reviewed in the forum does not apply, we can blame AMD, but something else is really advertised. With 2 modules it works correctly, but not with 4. If these problems exist, ASUS should include it as relevant information. In this sense, I chose ASUS as a trusted brand, and that is why I was disappointed. What I expect from ASUS as a brand is that they solve the problem, with the previous modules so that not only 2, but all 4 of them work correctly, instead of commenting that they are the latest. I have also tried lowering the frequency, but the result has been the same, it still does not work. Can you think of what else I can try to make the 4 modules work at a speed higher than the Jedec standard?

ASUS doesn't advertise speeds of up to 8000Mhz and 192GB, because such a kit does not exist.

The problem is you're combining memory kits, it has nothing to do with fine print or any strawman argument one cares to create.

You haven't even specified which board you are using. Each SKU has their own memory QVL, which will show all the kits which ASUS has validated as working (but not once combined with other kits, which is not supported by ASUS or the memory vendor).


If you're combining memory kits, the drawbacks from this are all listed in the aforemention article. The reality is if having to ask such questions, one shouldn't be combining memory kits.

Memory issues are difficult to navigate even with single kits if the user does not have a grasp of what the various timings and voltages do. Once you combine kits, everything that's a relatively known quantity regarding what the kit can do regardless of the motherboard or platform goes out the window.

Use a single kit validated for your motherboard.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

I have included all the specifications in my first post: "cpu: amd ryzen 7950x

memory: 4 modules KF660C36BBEK2-64 (compatible with mb)

geforce rtx 4080

PSU: 850W

The truth is that I am very discouraged with ASUS and the bios they provide for rog strix x670e-e gaming wifi. I have tried several modules, all of them compatible and when I connect the 4 modules to obtain the 128GB, when I activate expo and recognizing the modules correctly (6000Mhz) the system does not start and the bios crashes. When I leave only 2 modules in the proper position, the system works correctly. If the memory is completely compatible, does that mean that Asus doesn't do adequate testing to recommend the modules? Can someone help me solve this problem?"

Can you help me based on what has been mentioned? As I have indicated, the problem exists when even using the same modules for all the sticks, the motherboard gives an error and does not work. For 2 if it works...

I can't see that kit on the QVL. Please post the part number as it appears on the memory packaging. Please note that maximum validation success also depends on the quality of the CPU memory controller. All of this information is in the aforementioned article, there are no assurances with overclocking due to variance between parts. Please also take care to inspect the socket support column.

Silent_Scone_1-1715174635505.png

 

 

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

That is the reason for my complaint with ASUS. You can't sell that a board accepts up to 192GB of RAM when ASUS lies to us. I have tried many kits with at least 2 compatible slots and there is no way to configure them to be able to use the memory speed. It is not worth referring to the compatibility sheet because there is no way to have 128/192GB because there are no compatible memories, to have that speed. Why put 4 sticks if only 2 work well? Why is Asus deceiving us by saying that it allows memories with speeds of 8000Mhz, when it is not true? When is ASUS going to do things professionally, generating bios that support the capabilities they sell? Honestly, my anger is increasing and I did not expect this from ASUS.Imagen de WhatsApp 2024-05-08 a las 17.53.03_bf48598c.jpgImagen de WhatsApp 2024-05-08 a las 17.50.45_7b059c70.jpgImagen de WhatsApp 2024-05-08 a las 17.50.45_10497542.jpgImagen de WhatsApp 2024-05-08 a las 17.49.13_4ad52e89.jpgImagen de WhatsApp 2024-05-08 a las 17.48.39_1e228b32.jpg

 

I would consider perhaps not trying to posture blame on to vendors when nobody has told you to combine two kits. Put it down to misadventure on your part.

1. The platform supports 192GB when ran within spec (JEDEC) and with designated kits, it's also important to realise 48GB modules were released post launch, meaning the boards were not initially designed with the IC type in mind when overclocking.

2. Overclocking holds no assurances, the higher the density and speed, the more likely manual intervention is needed.  The memory ratios beyond stock are denoted as (OC) directly on the product page as can be seen from your own screenshots

3. If not willing to tune manually, stop combining memory kits and run the kit at default settings. 192GB @ 6000MT is simply not possible on X670, which is why no such kit exists, so the fault lies with yourself and not others.

You can try reducing memory frequency to 5600MT and increasing VDDQ/VDD voltage, beyond this, few people will be willing to guide you through a tuning process. There's also no guarantee 5600MT in 4x48GB configuration is possible on the CPU sample.

This is why the QVL exists. If overclocking held assurances, there would be very little need for boards to have one.

All the best.

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

I think you are very wrong with your statements. As you can see in the screens that I have attached, without choosing speed, only choosing the necessary kits to complete the 128/192GB sizes, there is no way to do it except by using the 4 memory slots, therefore, because ASUS says that the Does the motherboard support up to 192GB when it is not possible, according to the list you indicate? I think ASUS is kidding us all. If, as I said, it is not even possible with JEDEC, this is a deception. The big question is, why is ASUS not clear and deceiving its customers? If really, as you say, the technology does not allow 192GB of RAM, why did the 48x2 kits come out after the motherboard, why does ASUS indicate that 192GB can be mounted? But the best of all is that as you can see on the screens, the same thing happens when you try to create 128GB using 4 memory slots. Did the 32GB modules also come out after the board? Honestly, I expected more help from ASUS, being the recognized brand that it was, because it is no longer that way. I have no problem in indicating that it was my mistake to trust the indications that ASUS provided and that, by applying basic mathematics, it can be inferred that it is supported... Perhaps my big mistake was also trusting ASUS as a brand to build. my new equipment, for this reason I am seriously thinking about returning it since ASUS does not support what it indicates, and I think it is a mistake for ASUS to indicate that its customers make mistakes when choosing technology, when what they should What to do is to become ASUS again, that is, to be a reliable brand, which it is not now.