Core 2 Duo 17" iMac here. Stock 1GB RAM. Started Parallels version 1922 while a DVD burn in Toast was underway, and bam, gray shade of death dropped. DVD is a coaster. Kernel panics are nasty, nasty things. One of the best things about OS X is that when an app crashes, the system does not. Shame that Parallels has to muck with the kernel. It's the one bad thing about an otherwise fantastic app.