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Core Isolation can cause driver instability

Nov 15, 2020
896 (0.68/day)
System Name 1. Glasshouse 2. Odin OneEye
Processor 1. Ryzen 9 5900X (manual PBO) 2. Ryzen 9 7900X
Motherboard 1. MSI x570 Tomahawk wifi 2. Gigabyte Aorus Extreme 670E
Cooling 1. Noctua NH D15 Chromax Black 2. Custom Loop 3x360mm (60mm) rads & T30 fans/Aquacomputer NEXT w/b
Memory 1. G Skill Neo 16GBx4 (3600MHz 16/16/16/36) 2. Kingston Fury 16GBx2 DDR5 CL36
Video Card(s) 1. Asus Strix Vega 64 2. Powercolor Liquid Devil 7900XTX
Storage 1. Corsair Force MP600 (1TB) & Sabrent Rocket 4 (2TB) 2. Kingston 3000 (1TB) and Hynix p41 (2TB)
Display(s) 1. Samsung U28E590 10bit 4K@60Hz 2. LG C2 42 inch 10bit 4K@120Hz
Case 1. Corsair Crystal 570X White 2. Cooler Master HAF 700 EVO
Audio Device(s) 1. Creative Speakers 2. Built in LG monitor speakers
Power Supply 1. Corsair RM850x 2. Superflower Titanium 1600W
Mouse 1. Microsoft IntelliMouse Pro (grey) 2. Microsoft IntelliMouse Pro (black)
Keyboard Leopold High End Mechanical
Software Windows 11
Just a heads up that this may be an issue if you are having driver timeouts, freezing or crashes.

For a couple of months, I was battling something with my PC just not sure what it was. I would get occasional and random freezes requiring a startup. I'd get driver timeouts in some games (not all). So I did the usual: rinse and replace the GPU driver, sfc, DISM, new BIOS, changed the monitor cable, reseated the memory and graphics card, reinstalled a fresh Windows, clean boot to check for conflicts. Nothing. Every startup I was getting Event ID 28 kernal errors. Something was wrong but I couldn't flush it out. Felt like the graphics card driver somehow.

Not so. Some brainy chappie at Microsoft Support when I reached out to them inquired whether I had Memory Integrity and Core Isolation enabled. I did. Then the penny dropped. Windows Defender was on occasion refusing application access to the driver via Core Isolation. When I disabled it the error messages were gone. No more freezes or driver timeouts.