I have noticed my G5 iMac rev B has been acting very sluggish lately. I have 1GB of memory (1 stick of DDR SDRAM with speed of PC 3200U-30330.) The programs that I run all the time are safari, mail, the dock and dashboard. All the other programs I only open when I am using them. I looked at the activity monitor and it shows that I have more page outs vs. page ins. Page outs are 442612 and page in are 436314. Should/Do I need more ram? I went to crucial's web site to look at ram. They have 1GB of DDR PC3200 for $89.99. Can I get this and use it in my other DIMM slot or do I need to buy matched pairs. They offer a 2GB kit (1GB X 2) for $179.99. Is it difficult to add ram to the iMac G5? Thank you for all your help.