DDR5 RAM Expo - NOT BOOTING

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   Yes, BIOS is latest version currently 3.40.

Only with Memory Context Restore DISABLED the motherboard can POST.

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vrock442 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 19 Sep 2025 Status: Offline Points: 75	Post Options Post Reply Quote vrock442 Report Post Thanks(0) Quote Reply Posted: 19 Sep 2025 at 1:50pm
	Yes, BIOS is latest version currently 3.40. Only with Memory Context Restore DISABLED the motherboard can POST.

NDRE28 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 08 Sep 2024 Location: Romania Status: Online Points: 1970	Post Options Post Reply Quote NDRE28 Report Post Thanks(0) Quote Reply Posted: 20 Sep 2025 at 4:39pm
	Hi! Please try the following: Enter the BIOS menu, load the EXPO profile DDR5-6000. Then, go to DRAM speed and select DDR5-5600. This way, the RAM will work with the EXPO voltage & timings, and only the DRAM speed will be a bit lower. Save changes & exit BIOS. Then, test the system with MemTest86 (it will take a few hours to complete). You'll need to create a bootable USB stick for it, and boot with it. For context: Your CPU, just like mine (R9 9950X), is guaranteed to run with DDR5-5600! Going above that speed is not a given! It's all about the silicone lottery: Some CPUs can hit higher frequencies than the official spec. Stability is more important than speed!

neolz75 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 20 Apr 2025 Status: Offline Points: 455	Post Options Post Reply Quote neolz75 Report Post Thanks(0) Quote Reply Posted: 20 Sep 2025 at 11:42pm
	clear CMOS and then try once expo settings recommended whether it gets stable or not ?

vrock442 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 19 Sep 2025 Status: Offline Points: 75	Post Options Post Reply Quote vrock442 Report Post Thanks(0) Quote Reply Posted: 9 hours 49 minutes ago at 6:47pm
	I have tried all viable solutions - different RAM speeds, Default RAM speed without OC, MCR Enabled/Disabled, CPU voltage settings, reseating RAM sticks etc. I do not have time to test all possible settings outside the scope of regular troubleshooting. Almost always cold boot hangs, needs a restart and even then it is not guaranteed to POST. Warm boot is fine. Yesterday I installed a different RAM kit, it works fine so far, zero boot issues on several tests. I need more time to test cold boot routines to confirm it is working. It is very likely I got a faulty RAM kit, or it is borderline not compatible with the CPU IMC or motherboard.