AMD didn't send a message in bios/restart using A-XMP/EXPO settings, yet the system works after power cycling the PSU.
AMD didn't send a message in bios/restart using A-XMP/EXPO settings, yet the system works after power cycling the PSU.
Hello, TL;DR; restart works without EXPO or a reboot, but EXPO is needed for cold boot. The setup uses an MSI B650-P with Hynix 2x16GB kit and CL32 6400mts (XMP optimized). No A-XMP profile is present, so the system boots normally from BIOS and restarts without issue. When A-XMP is applied, it stops restarting both in BIOS and Windows. Cold boot is fine. Events in order: PC built late 2023, A-XMP enabled, everything functioned. Disabling memory context restore and power down enable helps stability. Recent changes like OC-ed RAM or buildzoid timings didn’t fix the problem. The system remains rock solid—CPU overclocking, PBO, negative curve optimizer, extended clocks all hold up. No crashes from watchdog errors or memory issues. It’s possible XMP optimization is interfering with stability. If you’re still having trouble, check if other profiles are active or consider a different RAM type.
I adjusted the TRX timing from 28 to 126 based on suggestions from forum members for AM5, but it didn’t improve things. Made some voltage tweaks (SOC, RAM VDD, VDDQ, etc.) though nothing changed. I’m told it should increase RAM stability, and tests under stress confirmed that. Still hoping for a solution.
Is your speed at 6400MT/s? That might be the cause—high memory rates can lead to instability on certain processors, even though tuning VDDP can help. If you're closer to 6200 or 6000, it's unlikely to be the problem. Consider reactivating Power Down Enable, as it often improves stability when turned off.
I'm experiencing the same problem since a few months ago. The RAM sticks are at 6000 MHz. I updated the BIOS recently and turned on EXPO and PBO auto with thermal throttling at 85°C. Restarting by holding the power button doesn't work; I have to restart normally during Windows updates. My MSI MAG B650 Tomahawk Wifi G.Skill 2x16GB 6000MHz CL32 DDR5 Ryzen 7 7700 GTX 1080 Seasonic M12II EVO 750W is running on bronze storage with two SATA SSDs and three HDDs. It seems the power supply might be the issue, especially since it functions well under heavy CPU/GPU load or during OCCT's power tests, but not when stressing both at once.