When the CPU usage is low, it's about 800mhz but goes up swiftly. We did reset the motherboard earlier today due to issues with a new GPU. Do you think that this is the problem? How can I fix this?
Since you've stated that your system has been given a GPU upgrade, did you reinstall your GPU drivers using display driver uninstaller and using the latest GPU drivers form the GPU chip manufacturer? Can you please pass on your full systems specs? Are the rest of your devices drivers and your BIOS up to date?