Hi, I've got a Powermac G5 Dual 1.8GHz with 1 gig of RAM (4 x 256 Crucial). Unfortunately it is the 4-ram slot model, so to upgrade RAM any further I'd have to remove a pair of 256 and stick a pair of 512 in there or something. I can find PC3200 512mb RAM extremely cheap on web sites like Newegg. It's all rated as CAS 3 latency, and it's all off-brand I've never heard of or seen anywhere else (brans like "Wintec", "Ampo", "Rosewill", etc.) I've read a bunch of web sites that explain exactly what CAS latency means, but no web sites are willing to make a broad claim on the effects of chosing CAS2 RAM over CAS3 RAM. All the web sites I found were like, "CAS2 ram could improve your system performance". My G5 owner's manual simply says that it takes CAS3 memory. My questions are these: has anyone had experience putting these off-brand memory sticks in their Powermacs? Or should I just stick with crucial? And, given my system, do YOU think it would make a difference in system performance if I went with the (MUCH more expensive) CAS2 memory over the CAS3 memory? I rarely play games, but want a memory upgrade because I need to run memory-hungry applications like MATLAB, and I think a 512mb or 1gig RAM boost might help. Thanks for your input.