Question 128/192 GB DDR5 RAM on ASUS motherboard

[actionmystique]

Hi everyone,
This build is based on the ASUS TUF GAMING X870-PLUS WIFI, and I'm having a hard time finding x4 DDR5 kits of 128GB or 192GB.
According to their respective website and corresponding RAM "selector",
- G.Skill has nothing to offer
- same for Kingston
- Corsair RAM finder tool has no knowledge of that motherboard (yet?)

On Asus side, the only compatible RAM kit listed for that motherboard to attain that RAM size is the Corsair CMH96GX5M2B5600C40, which is a 2x48GB, and it seems that mixing 2 different kits can lead to an unstable system. Anyway, I can only find one kit available in my region right now.

So, there are only 2 left options which are not listed on Asus website:
- CORSAIR CMK128GX5M4B5600C40 4x32GB 5600 40-40-40-77 1.25V UDIMM
- CORSAIR CMK192GX5M4B5200C38 4x48GB 5200 38-38-38-84 1.25V UDIMM

Has anyone tested one of those on that motherboard?
Or maybe someone has tried another kit fitting that size?

 

[Ralston18]

What is driving the requirement for 128GB or 192 GB?

My overall sense is that most applications/games do not need that much RAM and would not use all of the RAM anyway.

What game(s) do you play?

 

[actionmystique]

What is driving the requirement for 128GB or 192 GB?

Heavy virtualization with many virtual machines on KVM/qemu (linux).
I know what I'm doing regarding the RAM size requirement.

What game(s) do you play?

I don't on this system.

Also, I don't intend to perform any type of OC.

 

[actionmystique]

I did not encounter any issue using 128 GB of DDR4 Kingston x4 kit on B550.

 

[cruisetung]

AI/VM/graphics/video editing use a lot of memory

I think Corsair offer 30 day return policy if you purchase directly from them.

 

[Eximo]

DDR5 is a different beast. Higher frequencies demand better binning.

There are some 4x32GB kits on the market that are reasonably priced. Not usually the best timings or speeds, but certainly the capacity is there. Probably not going to find them on too many motherboard QVL though.

4x48GB, you would be better off with JEDEC memory sticks running at 4800, maybe 5200.

I was unable to get 2x32GB dual kits to work at anything faster than 3600, and even then it was flaky. So much so that I couldn't reliably do manual memory setup, took too many CMOS clears and I gave up after about an hour having only tried about 10 configs. The memory training time of AM5 is quite debilitating.

 

[Eximo]

https://pcpartpicker.com/product/BX...-gb-ddr5-5200-cl38-memory-cmk192gx5m4b5200c38

https://pcpartpicker.com/product/HK...-gb-ddr5-5600-cl40-memory-cmk128gx5m4b5600c40

 

[actionmystique]

4x48GB, you would be better off with JEDEC memory sticks running at 4800, maybe 5200.

Unfortunately, the corasair kits I listed above are ... the only ones I found

 

[Eximo]

You can still get individual sticks. They are built with low speeds and loose timings to practically guarantee compatibility.

Hmm, even 64GB stick from Crucial.

https://www.crucial.com/memory/ddr5/CP64G56C46U5

https://www.crucial.com/memory/ddr5/CP48G56C46U5

https://www.crucial.com/memory/ddr5/CT32G52C42U5

You can also hit up professional suppliers like CDW, they charge a lot, but they often stock the more oddball things.

https://www.cdw.com/product/crucial...mm-288-pin-2800-mhz-pc5-44800/7853988?pfm=srh

https://www.cdw.com/product/mushkin...dimm-288-pin-2800-mhz-pc5-448/8273757?pfm=srh

https://www.cdw.com/product/mushkin...dimm-288-pin-2400-mhz-pc5-384/8273715?pfm=srh

 

[kanewolf]

Heavy virtualization with many virtual machines on KVM/qemu (linux).
I know what I'm doing regarding the RAM size requirement.


I don't on this system.

Also, I don't intend to perform any type of OC.

If you are doing virtualization, you are better off buying a used server chassis that is designed for what you want. Using desktop hardware (no ECC) for large memory configurations on what might be "mission critical" is a bad decision.

 

[actionmystique]

If you are doing virtualization, you are better off buying a used server chassis that is designed for what you want. Using desktop hardware (no ECC) for large memory configurations on what might be "mission critical" is a bad decision.

In theory, you are absolutely right, unfortunately, right now, my pockets are not deep enough. Also, did I say it was "mission critical"? 😉

 

[kanewolf]

In theory, you are absolutely right, unfortunately, right now, my pockets are not deep enough. Also, did I say it was "mission critical"? 😉

Which is why I said "MIGHT BE" ... "Heavy" virtualization as you said, is not typical home learning lab type usage. Four to eight GB VMs is typical for most home applications. And long lived (months) applications is typically not a home lab.
I would consider many of the services I have at home to be "mission critical". PiHole? YEP (so much so, I have two independent instances). NAS? YEP (again I have two).
Considering how much you spent on an X870, probably a 9950 CPU and RAM, you could have EASILY purchased a used Xeon based server.
Good luck on finding hardware that will work together.

 

[cruisetung]

Used/2nd hand servers with 256GB can be very cheap, however they are hot, noisy (tornado level?) , heavy, big and power hungry as hell. And slow.

 

[kanewolf]

Used/2nd hand servers with 256GB can be very cheap, however they are hot, noisy (tornado level?) , heavy, big and power hungry as hell. And slow.

Slow is not usually an issue for "heavy virtualization". All the other attributes are true.

 

[cruisetung]

Slow is not usually an issue for "heavy virtualization". All the other attributes are true.

Yep, most of the time they are idle.

 

[actionmystique]

It turns out the corsait 4x48GB CMK192GX5M4B5200C38 is officially supported by this motherboard.