On May 15, 2005, at 10:04 AM, Snow White wrote: > The 133 will work fine as it is backwards compatable to the PC100 > speed. > > Just do not mix them (PC100 and PC133). Seems to work for some but > my experience was that it was not as stable. YMMV. Mixed speed memory not working is the exception, not the rule. I have three Macs and a PC running with mixed speed memory and all work as expected. Phil