For some reason, it's not working in Vice City. Once they've all been changed, the game still runs too fast. It seems to run choppy too for some reason after altering the values.
Splinter Cell games work once the values have been altered in other xbe files. I'll quote myself from assemblergames:
It turns out Chaos Theory has sc3.xbe and sc3_adv.xbe, I just edited those to have the 1000000000Hz value and that seems to have solved the problem. Pandora Tomorrow has Offline.xbe that also needs the value changed to make the game work. As for San Andreas, I only noticed the first post had a quote which stated that it's usually in Hz, while that's kHz. I just got confused because I've seen that it's in kHz instead of MHz, but it's usually a value in Hz.