Larger non-QVL DIMMs on AM5?

Hey there,

how relevant is it (still?) to pick memory that is on the QVL list of a given motherboard with larger DIMMs on AM5?
I bought a kit of Kingston Fury Beast KF560C36BBEK2-64 during a good deal, i.e. two 32 GB Hynix A-Die DIMMs with EXPO-profiles up to 6000 MT/s CL36-38-38.
Expansion to 128 GB is not planned any time soon. Overclocking beyond EXPO profiles is also not planned, perhaps tightening the timings a little.

I’m planning to pair that with a 7800X3D and have the following motherboards on the short list:
B650E Steel Legend, X670E Steel Legend, B650 Tomahawk, X670E Tomahawk; although the B650 Tomahawk is rather my least favorite due to only offering a 6-layer PCB and no PCIe Gen 5 slot.

While the Steel Legend boards performed well in tests and there are many reports on people running larger memory combinations specifically on the X670E Steel Legend, ASRock does not list the mentioned DIMMs on their QVL list. MSI does for both mentioned boards, but there aren’t as many positive reports as on the ASRock boards, particularly on how stable a 2x2R memory configuration runs at “acceptable speeds”.

Does anybody happen to have experiences with the mentioned or similar boards with larger memory configurations, possibly also dual-booting Linux and Windows?
Is it still advised to stick to known working combinations of motherboards and memory, or has compatibility and stability improved recently, especially with AGESA 1.0.0.7(a/[b])?

@wendell: In your video on 128 GB of DDR5 on AM5 you also tested a Kingston Fury kit (albeit a RGB version) on a X670E Steel Legend - what kit was that specifically?

I use a 6 layer PCB board (B650 Creator) and 2x48GB DIMMs from G.SKill non EXPO with 6000 MT/s CL30-36-36-50 at the moment.
Maybe the 6 layer PCB will be an issue for 7000MT/s, which are supposedly possible with the new BIOS versions, but not with 6000MT/s.

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