X570 Taichi 2.70 UEFI won't post XMP Micron e-die

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   I have a set of 4 Crucial 3200 (Micron e-die) DIMMs in X570 Taichi with Ryzen 7 3800X. The memory works great with 2.10 UEFI at its stock 3200 XMP and even OC at 3600MT/s (1800Mhz 1:1 with IF). But after upgrading UEFI from 2.10 to the recent 2.70 the system won't post with anything but 2400MT/s JEDEC spec. I rolled back to 2.10, and the memory works again. Interestingly, my other set of 4 Samsung b-die sticks works fine at 3600MT/s with the new 2.70 UEFI.

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Synapse Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Dec 2019 Status: Offline Points: 62	Post Options Post Reply Quote Synapse Report Post Thanks(0) Quote Reply Topic: X570 Taichi 2.70 UEFI won't post XMP Micron e-die Posted: 12 Dec 2019 at 6:53pm
	I have a set of 4 Crucial 3200 (Micron e-die) DIMMs in X570 Taichi with Ryzen 7 3800X. The memory works great with 2.10 UEFI at its stock 3200 XMP and even OC at 3600MT/s (1800Mhz 1:1 with IF). But after upgrading UEFI from 2.10 to the recent 2.70 the system won't post with anything but 2400MT/s JEDEC spec. I rolled back to 2.10, and the memory works again. Interestingly, my other set of 4 Samsung b-die sticks works fine at 3600MT/s with the new 2.70 UEFI.

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(1) Quote Reply Posted: 12 Dec 2019 at 6:59pm
	could be related to VDDP locked at 0.6999V when set to 3600+ i'm just having a wild guess here


Synapse Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Dec 2019 Status: Offline Points: 62	Post Options Post Reply Quote Synapse Report Post Thanks(0) Quote Reply Posted: 13 Dec 2019 at 5:25am
	Yeah, it needs 0.8v to post and 0.9v to run stable. Thanks for the tip. I straight used the same settings that were stable on 2.10 and it wouldn't post, so I booted with 2400 and rolled back.

gizmic Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 13 Jun 2018 Location: Hong Kong Status: Offline Points: 677	Post Options Post Reply Quote gizmic Report Post Thanks(0) Quote Reply Posted: 13 Dec 2019 at 11:14am
	if you can live without the update just stay there until they fix it or use 3533 on the new bios


Synapse Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12 Dec 2019 Status: Offline Points: 62	Post Options Post Reply Quote Synapse Report Post Thanks(0) Quote Reply Posted: 13 Dec 2019 at 4:04pm
	I gave it another try, and it works now for some reason. It was not able to properly load my profiles I saved with 2.10 this time around. But selecting XMP with everything else on default worked. VDDP is 0.92v on Auto. I had to re-enter all my settings manually, but it can now boot into Windows at 3733 with VDDP set to 0.93v.