Thanks again Sean, If I understand you correctly the PowerBook has a 64-bit memory controller? Joel 2004-10-05 kl. 19.30 skrev Sean Terrill: > The Cube's memory controller is a 32-bit controller, which only lets > you fit > 512 MB worth of RAM on a board. Any 1 GB DIMMs are 64-bit and not > addressable by the memory controller. Depending on the architecture of > the > DIMM, you might be able to address half of the 1 GB, but the point is > moot - > I don't think anyone makes 1 GB 168-pin SDRAM, because no one makes a > 64-bit > SDRAM controller. > > Hope this helps, > > Sean Terrill