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Yeah AMD’s memory controllers, especially DDR5 seem to have a lot more difficulty at high speed with 4 slots filled. I used to plan upgrades around populating 2 slots and doubling if needed a few years later, instead now you really need to plan to ignore those slots if you are needing memory performance for things like gaming versus raw capacity.

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avidamoeba@lemmy.ca ⁨1⁩ ⁨week⁩ ago
Yeah, I didn’t need 128GB, but as soon as I figured what’s going on with the 4-DIMM config, I ordered another kit to fill what I think I’d need for the lifetime of the system.

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- halcyoncmdr@lemmy.world ⁨1⁩ ⁨week⁩ ago
  Similar issues even with just 2 DIMMs with some XMP/EXPO profiles not working on AMD systems because of board/CPU limits. It should technically work, but for whatever reason it just can’t handle it and speeds need to be dropped or the timings loosened a bit even though the RMA itself is rated for that.
  
  Not that the higher speeds are even necessary for 90% of users outside extreme overclocking. DDR5 6000 is basically where you reach diminishing returns anyway, and that’s often where that limit seems to appear.
  
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  - avidamoeba@lemmy.ca ⁨1⁩ ⁨week⁩ ago
    Ugh. And as far as I’m reading, we’re hitting limits with the connectors and interconnects so the next iteration up might require some type of CAMM interface. 😔
    
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