I got a CSPPC aswell and although it's just the 180Mhz version I would never overclock it due to the fact that the cooling is poor on the board. Even with normal use today the fan definitly needs changing and preferably the coolingplate too. I don't use the PPC atm so I've just upgraded the 060 cooling so far with coolingplate and fan... the placement of 2 hot CPU's so close to eachoterh ain't exactly brilliant... the way the coolingplate fixes to the card is also poor.
With OS4 with it's 100% PPC usage just around the corner you will find that you need much better cooling. I know an OS4 beta tester that has a huge 8*6cm or so coolingplate with fan for the PPC to keep it happy... that without overclocking.
