Question ryzen 9: support CUDIMMs?

[80251]

Will Ryzen 9, in particular the vcache-3D parts, support CUDIMMs? What about MRDIMMs?

 

[taeioum]

Good question, which I have had myself seeing as I'm trying to build a new PC with a 9800X3D. Just waiting for the ludicrous 9800X3D prices to drop. They're about 640 USD here right now.

What I've found on Reddit:

Ryzen 8000 and 9000 CPUs support CUDIMMs in "bypass mode". This means they will function without the CKD, so there is no benefit to paying more for it. Additionally, they will boot by default at DDR5-3200 (the lowest possible JEDEC speed) and will require manual tuning to run faster.
Don't buy CUDIMMs for use with AMD CPUs. As stated by an AMD employee on this very sub, the "support" is really just to a level of tolerance that avoids unusability.

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Better to keep aiming for regular DDR5 DIMMs.. Seems like a terrible time to upgrade or build a new PC.

 

[80251]

@taeioum
You're in practically the same boat I am, except I have a 9700k running at 5.2Ghz and I've overclocked my RAM.

BTW, I upgraded my 1080ti to a 4090. The least significant gain in min. FPS that I saw was 50%.

 

[taeioum]

I'm just wary of all the new technologies I hope will become default in the near future. Motherboards with connectors on the back (like the MSI Project Zero or ASUS BTF series), CUDIMMS or CAMM2 modules, GPUs with power delivery through PCI-E connectors and more..

 

[80251]

I don't have much space in the cable mezzanine behind my motherboard tray so backside motherboard power connectors wouldn't work for me anyway.

 

[taeioum]

Given that you have a case that supports it though. I mean, your case probably doesn't even have the cutouts where the connectors would sit/cables pass through..

It's just that all these new technologies are brand new or on the verge of being released and hopefully be mainstream soon.