Stuen4y: FWIW, I get the feeling that the PII 940 will clock pretty well using a board with the SB600.. Ofcourse at this point it's all specualtion, but here is the reason why.

My original and favorite board (before the Asus 79-T) was an MSI K9A2 with a SB600 southbridge. Here are my results with different X4's (all these were stable clocks and not pushed to the edge, I'm a wimp that way )...

9600 - Max OC 2.5Ghz (MSI)
9600BE - Max OC 2.65 (MSI)
9850BE - Max OC 2.82 (MSI) / 3.0 Max (Asus)
9950BE - Max OC 3.0Ghz (MSI) / 3.2 Max (Asus)

From my experience it looks like each revision of the core gets better performance (even on SB600), so if the numbers we're seeing turn out to be legit, I would expect the PII to hit 3.5+Ghz on an SB600 board.

I'm sure an SB750 would give you better results, but I'd be surprised if a PII wouldn't give at least decent clocks on the DQ6 (or K9A2 ).

BTW: I'm not really an Asus fan, but the 79-T is the best AM2+ board I've had so far! I had a 78-T as well and it was solid, but a terrible overclocker.
The MSI DKA790GX was a great OC'r, but the PWM section was a little weak. Mine died at 1.55 Vcore, and it was a little pricey.
Very nice board though and would probably be fine with a PII...