See for it at Crucial and OWC. No problem, but the slowest will set the speed. Paul Moortgat On 20-jun-04, at 02:57, Kevin Willis wrote: > I am thinking about adding some memory to my G4/400 Gigabit Mac. I > currently have 2-256 MB sticks of PC 100 RAM in it. I would like to > add another 256 to it. While I was checking TigerDirect.com, I > noticed that the PC133 is quite a bit cheaper than the PC 100. Will > the PC 133 work in my Mac? If so, would there be a problem mixing the > two different kinds? Also, why is the PC 133 so much cheaper? > > > Thanks-- > > Kevin