Ok, I have some time today, so I try to go higher with MHz . Cooling - still retail heatsink, but with 120x120x38mm fan. Results? Amazing for me

P4 631 - 15x375MHz=5.63GHz 1.5v BOX cooling -> CPU-Z Verified

@EZClock
My max spi 1M. Score wasn't exelent, but it was single channel and without optimalizations - only shut down explorer and high priority:

P4 631 - 15x345MHz=5.17GHz 1.375v BOX cooling -> Spi 1M

Another screen with Spi 1M, lower clocks, but more info.

@DEVIL K-ce
I promise

Regards