I am using K10stat to undervolt my CPU, due to heat issues, and I have noticed that I can do two things to achieve 2.1GHz core speed
1. FID:13, DID:0. This is unstable due to heat, since I can't undervolt it to 0.9V, it requires >1V, which leaves my computer smoldering.
2. FID: 34, DID:1. With this I can achieve a stable 0.9V. (tested with Prime95)
Why is there a difference? I thought it was Bus Speed * Multiplier / Divider = Core. The core speed seems to be, pretty much, (800+100*FID)/(2^DID), for the QL-65. So the net result is the same. So why is there a difference?