OS X will perform like poop with only 192 MB of ram. Doable, but you will be MUCH MUCH happier going beyond 256 MB. The catch with the Rev A boards is, they don't "officially" support 256 MB SO-DIMS. 128's are the largest they are supposed to handle. However, as long as you get 8x64 chips (as opposed to the newer 8x32), they seem to work fine. Also, watch out when you buy RAM, anything that goes in the lower RAM slot must be Low Profile SO-DIMMs. Larger ones won't fit. And also, some of the ram slots have metal retaining clips, those have been known to touch the pins on the ram chips keeping them from being seen. If you have one with metal clips, just tape off the edge of the ram chip to keep the clips from shorting them. -chris <http://www.mythtech.net>