Well I had good results on the 644G but zero effect on my 632a all depends on ya IHS , if it was pretty flat you won't notice much difference, but with my 744G it was immediately clear the edges were higher than the inner core... that CPU lost 6°C and I can now reach 3600mzh on 1.5 volts there while temps stay around 56°C coretemp...

Too bad temps didn't drop for my 632A ...