I have Asus B650 creator board with 2x 32GB 5200 DIMMs. I need to increase the memory on the system. At some point in the future it will be maxed out with 4x 48GB DIMMs.
The question is has anybody tried mixing 2x 32GB and 2x 48GB modules? The machine is mainly used as a server and I am not targeting higher memory speed than 5200/5600 if even possible.
Listening on Wendel 4x DIMMs on AM5 is generally an issue and doing with non-matching modules seems even more risky.
Most likely it is not a good idea but somebody might have tried - there are crazy people here
With Ryzen 7000 4 dimms populated, you are probably limited to 5200/5600 max. I would not recommand to mix 32GB and 48GB. Mixing ram reduces the stability further. You could be limited to 3600 only with mixed kit.
At this point, I would wait for Ryzen 9000 releases. Rumor says they can run 4 dimms at 6000.
Timings would be especially all over the place if you install such a weird configuration. Also buying two different kits in different time periods might expose you to die changes inside the sticks that might make your system totally unstable. G.Skill is especially known, as far as I know, for swapping dies inside memory kits while having the same primary timings and voltage.
On AM4 I’ve managed to run a 48gb configuration with some success (8/16/8/16 AABB), but AM4 doesn’t “fall apart” at quite the level AM5 does with 4-DIMM configurations in the first place.
I’d probably try it. It’ll either work out fine, or be such Instability Hell™ that you drop back to just the single 2x48 kit. It may have been a problem with how I was testing it, but I got that configuration to work faster than the involved 8gb DIMMs ever could by themselves, which was odd.
There’s no issue as long as you stay within spec and JEDEC specs? That being said, 6 PCBs seems to be more sensitive in general but that doesn’t necessarily mean that you’ll run into issues. Expect 3600 (what specs say) / 4000MT speeds with 4 DIMMS which in most cases is fine.
Edit: Do note that not all CPUs support more than 128Gb of RAM
