The issue is that the ATA connector is in the way of the wide CPU card itself. The QS heatsink is a different issue and would normally interfere with the CD/ZIP bays in a Sawtooth/GBE case.

For the purpose of this conversation, Sawtooth and Gigabit Ethernet are effectively the same as far as I recall.

12v to the additional mounting hole of QS modules is correct.

I am not aware of a firmware modification that actually OCs the bus, but it has been a long time. You can add a DIP switch to a spot near the RAM (visible in my pic) but at least with the Sawtooth, idk about GBE, you are not likely to hit a stable 133 according to the internet. Though tbh I only just added the switch to my Sawtooth and have not tested it yet.

In your case you are going to have to hack off the ATA connector. you could solder wires in it's place though if you really need it. Be really cool to find one that we could just solder directly to the underside of the board after stripping the old one off but it is not as simple as just flipping a regular connector around.

For anyone else considering, you might look at overclocking a 533MHz Digital Audio CPU?(if you are /really/ inclined to push things) http://www.xlr8yourmac.com/systems/DA_CPU_in_Sawtooth/DA_CPU_mods.html