I expect it's just because RTSS is measuring the clock in a different way but I couldn't find information on this online. What exactly is the RTSS "CPU clock" representing? I know there is a CPU clock 1-16 option for the RTSS overlay (my CPU has 8 cores/16 threads) and then the "CPU clock" option I'm using below those. I had assumed this was a kind of "aggregate cores clock", but now i'm not so sure (the RTSS option pretty much always reports a much higher clock than Windows does). I imagine this is all working correctly as expected just wondered about the discrepancy in readings/output and why that might be. Thanks a lot! Side note, absolutely love this tool, RTSS is awesome.