-Latest motherboard bios version flashed. (FB5)

-Checked if all motherboard drivers where up to date.

-Checked for windows updates.
 
-Windows power plan to maximum performance.
 
-Reinstall audio and GPU drivers with newest drives (uninstalled using DDU)
 
-SFC /Scannow etc
 
-Tried older gpu/audio drivers, I forgot which ones, but all where 32.x.xxx.xxxx versions. 28/06/2025 I will try older 31.x.xxx.xxxx versions as suggested by a Microsoft advisor.
 
-Disable/uninstall all other audio drivers (monitor and AMD, realtek driver was kept).
 
-Switched to Microsoft generic audio driver.
 
-Disable Windows Game mode.
 
-Set USB drivers to not allow computer to turn them off to save power.
 
-Disabled High precision event timer.
 
-Disable iGPU driver.

-Disabled iGPU in BIOS.
 
-Disabled network driver (Only one driver installed, no wifi)
 
-Disabled all hidden USB drivers.
 
-USB selective suspend disabled.
 
-Set GPU to use PCIe 3.0 in BIOS.
 
-Disabled Global C states in BIOS.
 
-Disabled EXPO in BIOS.

-Disabled  PCIe Power Management Features in BIOS.

-Link State Power Management is off by default in my windows.
 
-Used PowerSettingsExplorer to set set idle demote/promote thresholds to 100%. (Solved ISR latency before clean windows install, did nothing for DPC).
 
-Unparked all cores with UnpackCPU program (they seemed to already be unparked).
 
-Disabled DynamicTick.
 
-Couldn't find AMD Cool & Quite in bios to disable (not a thing in my cpu?).
 
-Used  MSI Utility v3 to check MSI settings. MSI seems to be enabled by default for my GPU. I did mess with the settings to try and fix this issue, which then led to blue-screens during windows startup. I wasn't even able to boot into windows recovery or do a fresh install, what finally fixed it was resetting CMOS, I then reinstalled windows anyway to be safe and continue testing the DPC problems on a fresh install.

-Clean install of windows, with only LatencyMon, steam and arma 3 installed and not letting windows install GPU drivers. Beside obviously low frame rate and graphics, the audio/DPC Problem is NOT PRESENT before installing Arc drivers! After installing the Arc driver the problem instantly returned. Issue disappears again when Using DDU to uninstall GPU driver.
 
-Ran MemTest86: 0 Errors.
 
-Reinstall Arc GPU Drivers without Control Center After DDU.

-Installed Windows 10, same exact issue happens when Arc drivers are installed. No issue when Arc drivers not installed.