I've already almost finished my new framework.

There's some problems with that too.... (What else is new, eh? )
On my AMD Athlon XP it runs as it should (60fps rendering and 100fps game logic), but on my AMD Athlon 64 X2 both threads run at ~65fps, which is a bit weird.
I've been trying to set the thread affinity masks for the threads with no luck so far.