I have an older g5 tower and was wondering if anyone out there had tried to max out the ram in it. it is a dual processor (2ghz), but only has 4 ram slots. I have 4 gig's of ram currently but I am trying to replace the other two 256K chips with 2-2gig chips. I have tried to find 400ddr 2 gig chips but cannot find them anywhere. Suggestions?