I ordered my iMac G5 with 1 512MB DIMM from Apple, and a bought a second 512MB DIMM from Crucial (Crucial brand, but bought for less from someone else). Anyways, I opened up my iMac and installed the new chip, and also took a look at the Apple provided chip. I was happy to discover that the chip already in my iMac had the same Micron sticker on it my new chip from Crucial did. So both chips were from the same manufacturer and had the same CAS latency of 3. However, I noticed that my new chip from Crucial had all its little memory chips on the same side, whereas the Apple provided chip had memory chips on both sides. So now my iMac is up and running again, and recognizes that I have 1GB of memory. However, when I run this Applescript provided by MacBidouille, it reports that my memory bus is still only 64 bit. Is there anything I can do to get it switch to 128 bit? I've attached a picture of the memory section of my System Profiler, and also attached the Applescript so that others can test their iMacs. I'd appreciate reports from others who have run the test.