Gary, This will undoubtedly be a can of worms. My upgraded cube has a 1.3 GHz Gigadesign upgrade & it is flawless. Came with a "quiet" led fan that works OK but isn't as quiet as no fan Ken On Oct 27, 2005, at 2:22 PM, 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. > > > Thanks for any feedback > > Gary H