That's the conservative JEDEC-compliant speed, but if you want to go for maximum performance they are saying to aim for DDR5-6400 this time, up from DDR5-6000 on the previous generation.
https://www.techpowerup.com/324023/ddr5-6400-confirmed-as-sw...
That speed is likely only attainable with 2 modules installed, but with 96GB (2x48GB) kits available now that's not much of a limitation for most people.
My system has a 7950X3D and four sticks at DDR5-6600. The module density, board trace topology, and luck-of-the-draw on IMC/SOC can matter a fair bit.
Tuning voltages/timings can make up differences. Also remember the infinity fabric clocks and such being somewhat paired
I do have to make a point to boost the supporting IMC/SOC voltages before enabling that, or I can get a bit wedged.
The profile voltages (and clocks/timings) for the sticks themselves work fine - just the board/CPU itself needs some care.
It's at 1:2 or 2:1 or whatever makes sense, my firmware shows memclk/2 - haven't had my caffeine yet.
The memory can train/the system POSTs, but the OS fails to load. With some more fiddling this may be feasible - I'm not sure. Excited to try!
Additionally: the IF frequency is 2100Mhz, trying to go much higher doesn't work out. If I could get 2200 it'd factor nicely into the memory frequency too, but alas - chip isn't up to it.
For the infinity fabric if you're trying to push it checking for performance regressions is a good idea as it delays and retransmits as a form of pseudo ecc when it detects an error. Same with memory if you're not using all custom timings as motherboards can set some very much not good timings if left on auto and sitting on the edge of stability
Seeing 1:1 is potentially within reach, perhaps dropping down to 6400 is worthwhile. Thanks again, will give it a whirl!
While I have chosen the EXPO profile, history has shown boards can't reliably read the (sub)timings... so I do it/apply those :P I try not to mess with those much, I don't really know the relationships between them.
A 1:2 sync usually starts being worth it above ~7200MTs but I don't know how viable that'd be with 4 dimms, at the very least it'd need tuning the various termination impedances
With DDR5 and really, most modern hardware, having some more robustness (that pseudo-ECC whatever, clock stretching)... it might be worth considering performance as part of your validation
Just a boring Corsair Vengeance kit with OOTB settings as far as they're concerned. The CPU needed help
I actually expressly didn't want to overclock the memory, just get something that ran nicely as-is.
I'm actually not at 1:1... stable. Perhaps wires got crossed? In another post I mentioned it POSTs but that's about it :( I may be able to get something there, but can't promise or over-represent it.
The memory is at 6600 but I have some divisor or whatever at memclk/2. This is super stable
If I were assembling a new computer tomorrow, I would probably get the 65W Ryzen 7 9700X with two 5600MT/s ECC unbuffered memory modules.