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It's kind of embarrassing because I used to work as a service technician at a popular computer store in the 2000s and Memtest86+ has been a standard fare of testing. I guess outside of OC, the shorter first pass truly was enough to spot bad RAM in the vast majority of cases. Plus multichannel interactions were not nearly as prevalent in the DDR1/2/3 days. I recently installed 4 DIMMS for 128GB on an AM5 machine just to discover that the 5600 RAM only boots at 3600 in a 4-DIMM config, as per AMD's docs. Could force it higher but without extra adjustment it can't go beyond 4600 on this machine. Back in the day, different DIMMs, often with different chips worked in 2, 4-DIMM configs so long as they matched their JEDEC spec. backinmyday.jpg
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.
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.
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.
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. 😔