Hello,
I was excited to see this BIOS update mention improved compatibility with JEDEC speeds as I've been reporting issues for several months to support about this with no resolution; unfortunately, it still does not fix my problem.
I am having trouble with 4 DIMM support. I'm not expecting EXPO to work, i just want the standard JEDEC DDR5-3600 speeds to be stable. Currently board boots with 100% success and is prime95 stable *if* I clear the CMOS every time before boot. Subsequent boots fail. This has been an issue with every single BIOS since I purchased the board.
Prior to BIOS 1805, I could not even Save and Exit the BIOS with no changes - my only way to boot was to immediately start the OS from boot override without changing anything. As of BIOS 1805, I can Save and Exit *one* time. After that any subsequent boots fail. As of that BIOS I can also run DDR5-4800 stable if I select it during that first reboot, and it is always stable. Any restarts after that fail whether I keep it at the default (Auto -> DDR5-3600) or run DDR5-4800.
This issue does not seem impacted by whether or not Memory Context Restore / DDR Power Down options are enabled or disabled, or left at auto. It still occurs either way. When the board hangs, code on the LED is P0. CMOS reset, everything magically works again and the cycle repeats.
This issue is driving me insane as I have the machine in a Tower 900 case and have to rip the top off to press the clear CMOS option. I desperately just want to be able to reboot my machine without having to constantly do this.
Memory is CMH64GX5M2B6000Z30 32GB x 4 = 128GB. These are 2x 2x32GB kits (second one was added later). I know that's not ideal for EXPO, but I'm not expecting EXPO to work. I am happy just if it works with the baseline JEDEC DDR5-3600 profile, which considering it does 100% of the time if I clear the CMOS before booting, very clearly seems to be a BIOS bug. I just want the board to do whatever it does when I boot with CMOS clear *every time*. I am happy with the system booted from that state.
