I borrowed a 1GB stick of MBP RAM from work today. Put it in my PowerBook G4, works ok, no unexpected shutdowns. However, when I go to System Profiler and check out the memory, it shows the following: SODIMM0/J20STANDARD 1GB DDR2 SDRAM PC2-4200S-444 OK SODIMM1/J23REVERSED 1GB DDR2 SDRAM PC2-3200S-288 OK The first (sodimm0) is the ram that came with my laptop. The second is the one I put in from work. What is the difference between the 2? Is the second stick faster (4200 vs 3200)?