I have a Giga 1.3GHz - simple to install, no fan, has worked with no problems under MacOS 10.4 (had occasional problems in 10.3). David. On 27 Oct 2005, at 19:22, Gary Heartsfield wrote: I have a Cube with G4 450 What is the best suggested upgrade, I have used powerlogix upgrades on several G# b/w works well. Sonnett has caused problems.