Hynix M, Dual Rank 2 x 48GB
On tight sub-timings DDR5 7200 2:1 is very comparable to tight DDR5 6400 1:1. The difference between 6200MHz 1:1 and 6400MHz 1:1 is larger than that between 7200 MHz 2:1 and 6400MHz 1:1.
So far this set of Dual Rank M die can boot at 8000MHz but no matter the voltages or timings, 7400+ is just not stable.
2 Comments
your primaries for 7200 are looser than necessary. 34-16-42-38-126-76 should work just fine even on reasonable voltage.
EDIT: I suspect dual rank cares less about 2:1 mode than single rank does.
The dual rank 8000 nightmare, a story for the ages. The 7200 MT results are theoretically much more impressive to me than the 6400 MT results. I’ve only played with single rank 3gb M die, but I have heard of the horror stories of 8000+ dual rank. I assume your FCLK cannot go any higher? If you want 8000 to have a chance, I am not sure if you have tried bumping VDDIO to get it close to 1.45-1.47 (read at the sensor, not BIOS), that is what has stabilized it the most for me at least on single rank. Your ProcODT pu is also interesting but you’ve probably already tried 25.3. Could also try more VDDP. Not sure why it makes a difference at least for me but it really likes 1.16, makes it a hell of a lot more stable. You may have already found the limitations of the IMC, the sticks themselves, or the motherboard. Pretty good results either way.