Overclock your Quicksilver G4 to 1Ghz
For those of you who don't mind mucking around with your brand new PowerMac, there is already a page which shows how to overclock your Quicksilver G4 to up to 1066mhz. The pictures show a successful overclock to 1ghz with benchmarks.
It appears they upclocked a 867mhz model... it'll be interesting to see, if the dual 800's can easily be clocked upward.
The Japanese page has more pictures.