I've only focused on testing dual rank Samsung B-die in gear1 as that still offers the best performance of any DDR4 configuration. The kit used for testing all boards was a G.skill Ripjaws V 2x16GB 3600 14-15-15-35 1.45V kit.
Gigabyte Z690 Aorus Pro DDR4 - provided by Gigabyte
- Daily DR Samsung B-die Gear1 3866 15-15-15-28-1T @ 1.55V
- tested on BIOS F6A
- needs manual ODTs above 3600
- won't boot with high memory training voltage (generally more than 1.45V)
- needs RTLs locked after successful training
- has a safeboot function and POST code
ASUS TUF Gaming Z690-Plus D4 - purchased
- Daily DR Samsung B-die Gear1 3900 14-15-15-28-2T @ 1.6V
- tested on 0707 and 0808 BIOSs
- has color coded trouble shooting LEDs
- auto recovery is good
MSI Pro Z690-A DDR4 - purchased
- Daily DR Samsung B-die Gear1 3900 14-15-15-28-2T @ 1.6V
- tested on 100 and 116(this one really sucks) BIOSs
- needs manual ODTs above 3600
- has color coded trouble shooting LEDs
- auto recovery is good
The DDR4 memory controllers on my 12900K seems to kind of suck. Even on SR Hynix DJR and Micron dimms it maxes out at a little over 4000 in dual channel and 4200 in single channel (on every single board tested). With DR it can boot 4000 on the ASUS and Gigabyte but is incredibly unstable and so far nothing has changed that.
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