I just delided my 4690k and seems like the temperature did not improved as much as I anticipated.
Before 4.6ghz at 1.285v
Prime 95 Large FFT = 85C
Small FFT = 100C
After Delid with MX-2 IHS + MX-2 heatsink
Prime 95 Large FFT = 75C
Small FFT = 93C???
My old 3570k went from 95C to 75C prime 95 small fft after delid with 1.34v, what gives??? I also cleaned off all the old Intel black gue on the IHS and the PCB board, so the gap should be even less...