Random BSOD (WHEA_UNCORRECTABLE_ERROR) after installing new PCIe 5.0 NVMe drive
Need some troubleshooting help! Upgraded my primary drive to a Crucial T705 2TB Gen5 NVMe on an MSI MAG X670E Tomahawk with a 7800X3D. Whenever launching games or copying large 50GB video archives, the system throws a BSOD with `WHEA_UNCORRECTABLE_ERROR` (Bugcheck 0x124).
Things tested so far:
- Reinstalled Windows 11 24H2 clean
- Ran MemTest86 for 4 passes (0 errors)
- CPU stock settings, no PBO
- CrystalDiskInfo reports 100% drive health
Is this a PCIe Gen5 bus signaling issue or ASPM power saving bug?
Responses 2
This is a known issue on several AGESA 1.2.0.0a / 1.2.0.1 BIOS releases with Phison E26 Gen5 drives! Two fixes will resolve this immediately:
1. Update BIOS to latest release with AGESA ComboAM5PI 1.2.0.2.
2. In BIOS -> Advanced -> PCI Subsystem Settings: Set CPU PCIe slot from ‘Auto’ to explicit ‘Gen 4’ (or disable PCIe ASPM Link State Power Management). There is virtually zero real-world speed difference, and it completely cures the WHEA 0x124 bus dropouts.
@copperboard2648 You are a lifesaver! Flashed the new 1.2.0.2 BIOS and disabled ASPM in Windows Power Options. Just ran 4 back-to-back 3DMark storage stress tests and transferred 300GB of game files without a single hiccup. Marked as solved!
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