Hi, does anyone know how to do a DSDT override on Windows 8? It's not working for me. It did work on Windows 7. I extracted the .dsl file with iasl-20120913, edited it and then compiled and loaded it with ASL 4.0.0NT. The output was "Table overloading succeeded." The registry entry does appear in System\CurrentControlSet\Services\ACPI\Parameters\DSDT\FUJ___\FJNBB13_\01060000. But it is being ignored. No Large Memory entry appears in the device manager. I know that it's being ignored because normally when you install a DSDT override and then change the memory layout, for example by removing a memory stick, Windows will bluescreen on reboot. It does not. Maybe the registry location for DSDT overrides changed? Some observations I had on Windows 8: Windows 8 reacts differently to the TOLUD issue. When a device gets connected for which Windows 8 can't allocate enough memory, it does not show Error Code 12. Instead there is an error message saying - I'm translating now, so it might not be correct - 'No drivers are installed for this device' in the Device Status field in Device Manager, even though there are drivers installed (I previously verified that the eGPU was working by removing memory to circumvent the TOLUD issue and the device manager even shows the correct driver version). Screenshot. In addition to that, ntoskrnl.exe (or one of its threads) starts consuming 100% of one CPU core. As a consequence of that, all actions that will depend on it will not work anymore. For example searching for new devices in the Device Manger, disabling a device, connecting a different device, trying to search for drivers on Windows Update, etc. all result in the respective window freezing. You can't even shut down cleanly anymore, the shutdown will also hang indefinitely. This condition is permanent and can not be stopped by removing the offending device, only by doing a hard shutdown. Windows 8 will also does this if you boot with the offending device connected. It will hang during the boot animation. It seems to be the same issue as I can hear the fan revving up, so I know it's hanging with high CPU load. The only thing left to do is to abort the boot with a hard shutdown. As a bonus you'll have to deal with the "Automatic Repair" on the next boot because Windows detects it wasn't able to boot successfully. Besides that, when removing memory to circumvent the TOLUD issue, my eGPU is fully operational on Windows 8. Optimus compression and rendering on the internal display both work with an unmodded desktop driver, version 306.23.