Yes, i do have a PCI/AGP lock. I tried pumping my bus up to 400mhz and i got some odd problems.
Windows Booted Fine. I ran SuperPi and got some errors occasionly. I ran counter strike and it just closed randomly. I put my bus back to 333mhz for the time bieng. Im thinking the problem is my ram. I have 1x 512mb Stick of DDR 400 and 1x 256mb Stick of DDR 333 so when i overclock the 333mhz stick cant handle it.
Cooling wise, when i was on 400 bus it ran around 45C.
Wayne