AMD Ryzen CPUs compatibility with single profile XMP

[TIG]

I have Corsair 2x32 gb RAMs with single overclocking profile as XMP.

With Rog Strix X870E-E motherboard and Ryzen 9 9950x, I found activating EXPO profile was impossible with any bios version pushing me always to bios page to reset bios to default settings.

Does that mean XMP is not fully compatible with AMD??

[Illusion of Progress]

It means your particular motherboard, BIOS, CPU, and exact profile settings combination aren't stable.

XMP is just a branding for a collective of presets for RAM related things. There's nothing about it that makes it "not compatible" with AMD.

What exact RAM do you have, and what frequency/timings are you attempting to set.

Two DIMMs is generally a lot easier on DDR5, but if those are, say, dual rank and it's attempting to set higher speeds, I can see it being unstable.

Generally, north of 6,000 MHz and especially 6,400 MHz gets troublesome on AM5. That might be pushed down a bit with dual rank DIMMs (32 GB DIMMs would be dual rank right now). With four DIMMs, that's even lower.

[smokerob79]

get rid of the corsair ram and you will fix your problems.....get any set that EXPO written on the box or posted in the info....that means it supports XMP profiles on AMD platforms....really start with your motherboard manual for listed ram kits....then you know its tested with your board

[r.linder]

If it isn't EXPO supported then there's less guarantee it's going to work properly with AM5, G.SKILL Flare X5 or Trident Z5 Neo 6000 CL30 are what I would usually suggest for higher end AM5 builds

If you really want to push things and got a higher end motherboard focused on memory OCs then you could try to push over 7000

[TIG]

thanks all

[Phénomènes Mystiques]

G.Skill Flare X (low CAS) are all high tier Samsung B-Die and can be pushed higher two notches without any other OC (just set and forget the XMP/EXPO profile), higher CAS Flare X are Micron or lower tier Samsung B bins which are iffy about OC'ing past the listed rating - anything over 6000Mhz is hit-or-miss, stick with two stick kits as well.

[BurakZG]

To the topic author.
You are actually being confused.

XMP is just an information on RAM stick to say with which max settings this stick has been tested by the producent. It does not say, nor guarantee, you can run this speed on your PC.

The speed with which your RAM will work is determined by your CPU.
(because CPU is writing to and reading from RAM, and the data has to be on databus exactly(!) on the moment CPU expects, not earlier, not later, it's fixed). There is no such thing like "RAM working faster than CPU". For your CPU AMD guarantees that it can run RAM "2x2R DDR5-5600". see specs in link
https://www.amd.com/en/products/processors/desktops/ryzen/9000-series/amd-ryzen-9-9950x.html
The way AMD sets it, it means, that this speed is guarateed, but you can overclock a bit and run it faster. It depends on the quality of your particular CPU and RAM. DDR5-6000 seems doable, but if you have bad luck you might not achieve it and that would still be within specs.

"Push to 7000" - you can assume it's nonsense.

Motherboard does not do much when it comes to RAM speed. It can allow you to overclock (read: use XMP) or not. Very bad design motherboard can also cause interference of signal and slow things down. Motherboard can never make your RAM work faster.

[TIG]

BurakZG の投稿を引用：

To the topic author.
You are actually being confused.

XMP is just an information on RAM stick to say with which max settings this stick has been tested by the producent. It does not say, nor guarantee, you can run this speed on your PC.

The speed with which your RAM will work is determined by your CPU.
(because CPU is writing to and reading from RAM, and the data has to be on databus exactly(!) on the moment CPU expects, not earlier, not later, it's fixed). There is no such thing like "RAM working faster than CPU". For your CPU AMD guarantees that it can run RAM "2x2R DDR5-5600". see specs in link
https://www.amd.com/en/products/processors/desktops/ryzen/9000-series/amd-ryzen-9-9950x.html
The way AMD sets it, it means, that this speed is guarateed, but you can overclock a bit and run it faster. It depends on the quality of your particular CPU and RAM. DDR5-6000 seems doable, but if you have bad luck you might not achieve it and that would still be within specs.

"Push to 7000" - you can assume it's nonsense.

Motherboard does not do much when it comes to RAM speed. It can allow you to overclock (read: use XMP) or not. Very bad design motherboard can also cause interference of signal and slow things down. Motherboard can never make your RAM work faster.

[_I_]

xmp is not always guaranteed to work on ever cpu/mobo/ram combo
it is a profile that the ram can handle, and board should set for it
beyond that, the cpus imc is overclocked using xmp profile which not all cpus can do
4 dimms at over 3000/6000 is not very likely

worst case, if xmp is unstable, enable xmp, then manually turn down the speed/freq down one step and try again til it works

or giving the cpus imc, memory controller a small voltage bump may do the trick, but may risk damaging the cpu farther

[Corona Scurrae]

I have always had issues with AMD and xmp. No matter if both memory and motherboard support the jedec standard AMD determined. That's the reason why I always look for help on buildzoid's channel.
But according to the internet I was "unlucky" despite using motherboards and memory kits that specifically stated they support AMD expo.

Since then I sold my entire 7800x3d setup and built a cheap raptor lake asrock taichi combo. Haven't had this issue.

[Ralf]

WinterSolstice の投稿を引用：

G.Skill Flare X (low CAS) are all high tier Samsung B-Die and can be pushed higher two notches without any other OC (just set and forget the XMP/EXPO profile), higher CAS Flare X are Micron or lower tier Samsung B bins which are iffy about OC'ing past the listed rating - anything over 6000Mhz is hit-or-miss, stick with two stick kits as well. :csd2smile:

I remember people having problems reaching 6000MHz with Samsung with 7000 series cpu's, that why everyone bought Hynix A-die instead.
I would rather get Kingston Fury Beast KF560C30BBEK2-32

[TIG]

So which RAM would be most compatible with AMD CPUs and/or Motherboards

[GOD RAYS ON ULTRA™]

Go to AMD webpage and confirm supported ram speed. I believe it's only 5600, at least last time I checked.

Basically if you're trying to run higher than the supported speed, then that's considered overclocking. This type of configuration isn't supported, so if it works great, if it doesn't then sol without manual manipulation of the uefi options.

If you lowered it to 5600 you would have zero issues.

[Corona Scurrae]

TIG の投稿を引用：

So which RAM would be most compatible with AMD CPUs and/or Motherboards

Unless AMD and board partners magically found the solution I suggest you watch buildzoid and see which ram he uses and mimic his settings. I think he has a video in which - no matter the mb or ram kit - his suggested settings will work.

[xDDD]

TIG の投稿を引用：

So which RAM would be most compatible with AMD CPUs and/or Motherboards

It seems like DDR5 RAM is picky. I remember being confused at all the RAM kits at the store saying "For Intel" or "For AMD" but I guess they are designed for one or the other now.
I don't remember this being the case in the past but I guess everything is more complicated now.

[BurakZG]

Sorry to repeat my message, but people tend to believe in magic when it comes to RAM.
Your RAM will work with speed that your (exactly yours) CPU will support. 5600 is guarateed by AMD. Everything above is overclocking.

When choosing RAM, for your processor, the best is to take 6000MHz with the lowest CL (typically CL30). You will get no advantage by getting higher MHz, but the system will be slower with bigger CL. Corsair, G.Skill, Kingston... it does not matter so much.

NOTE: buy a kit 2x32GB. Don't buy 2 separate sticks. A kit is tested together by the producent.