I just tried this on two boards 2 days ago. Only Bios of the 3 I tried, that worked (at all) was the latest.

DO NOT OVERCLOCK! If you do, you will spend hours trying to get back to a stable state. Both boards showed OC in bios, but not once booted into XP.

Once OC was tried, it would not let the board back into maintenance mode and I had a lot of trouble getting unstuck. Bootable floppy bios method and .bio method didn't work at all.

It seemed to run fine at stock speed but didn't spend much time there as I wanted 3.5+ OC on air and stable. I returned the chip.

I am thinking about q6600 or e6600. e6600's are still too much money to be 'discontinued'.