I would like to make an interesting point.

I am overclocking a stack of 475/605 boards here for a buddy.

One of the boards was missing a cpu so i threw my 40mhz full 040 cpu from my old 840av.

anyways i thought that it was interesting how after the OC to 33mhz the cpu got quite warm but i could still mostly touch it

with out pain.

normally when you toss a 25mhz full 040 in there, and clock that bad boy to 33mhz... it gets really hot and needs a heatsink.

So i guess what i am saying is if you can get ahold of a Q840av 40mhz cpu, and install it into your q605/475/575 looks like you will not need a heatsink

@ 33mhz.