There is still a problem with 2.6.7-1.478smp and the x86 4G patch, I think. -478 smp kernel boots perfectly on a machine with 2GB memory. However on a similar 4GB machine with about the same complement of add-in cards (same motherboard, scsi, video, etc), the -478smp kernel gets as far as "Starting printing system" and hangs. It is still responsive to ctrl-alt-del after a delay of 1-2 minutes. Same results with no extra boot options or with "acpi=off" Rebuild of kernel with x86_4G disabled fixes the problem - boots fine, works as expected. Not yet tested with the uniprocessor kernel. - David