If seems that I have a choice. A couple kinds of RAM are listed as "working". The machine is a G4 Power Mac "Digital Audio" that has had a processor upgrade to a G4 1.2Ghz. "About this Mac" shows two RAM parts 256MB and 128MB both listed as "PC133 333". OWC (macsales.com) list two parts they say will fit PC133 CL3 322 PC133 CL2 222 Will the faster part really make any difference? I want to pull the 128MB SIMM and put in two 512MB parts.