I've been dealing with recurring shutdowns and blue screens for months. A repair shop already replaced the power supply and SSD, and I later performed a completely fresh Windows installation. The system was stable for about a month, but it recently crashed while idle with ATTEMPTED_EXECUTE_OF_NOEXECUTE_MEMORY, bugcheck 0x000000FC.
Windows, drivers, and BIOS are updated, and I've only installed games through Steam. The system uses an Intel Core i9-14900KF, MSI RTX 5070 Ti, MSI PRO Z790-P WIFI motherboard, 32GB of TeamGroup DDR5-6400 memory, and a 2TB PCIe 4.0 NVMe SSD. Games run normally, and the crashes seem random and usually happen while the PC is idle. What should I test next, and could this be related to CPU degradation or unstable memory?
2 Answers
At this point, I’d stop replacing parts at random and focus on CPU and memory stability. Set the BIOS to completely stock settings, disable XMP, and make sure the latest Intel microcode is installed. Then test the RAM with MemTest86 and run OCCT for both memory and CPU stability. A 0xFC crash can come from a faulty driver, but corrupted memory can also make Windows try to execute invalid data. Since you’ve already replaced the SSD and reinstalled Windows, the operating system itself is less likely to be the root cause. Check C:WindowsMinidump with WinDbg as well; the dump may identify a driver or provide evidence of hardware corruption. If the machine still crashes at stock settings with clean memory tests, the 14900KF becomes a strong suspect.
The 13th- and 14th-generation Intel stability problems are worth investigating. BIOS updates and newer microcode can reduce the risk, but they cannot repair a processor that has already degraded. Since the crashes happen mostly when idle and are difficult to reproduce, that does not rule out a damaged CPU. Test at default settings, review the minidumps, and use the warranty if errors continue. You may not get absolute proof from a single crash, so repeated failures at stock settings are useful evidence.
That possibility has been worrying me because the BSODs began months ago. The BIOS has been updated beyond the patches intended to address the issue, and games run perfectly, but the random idle crashes make the cause difficult to confirm. I’d prefer to identify the failing part before requesting a replacement, although the warranty gives me an option if testing points to the processor.
I tried disabling XMP during earlier troubleshooting and still had crashes, but that was before replacing the SSD and reinstalling Windows, so I’m willing to test it again. Should OCCT be run with XMP disabled first? I also have a repair warranty, so I can request a CPU replacement if the tests point that way.