I have successfully installed 8 GB DDR2 667 into my non unibody Early 2008 Macbook Pro. Performance is better then 4 GB and I haven't experienced any Kernel Panics yet.
This is Macbook Pro 4,1
Hey Hixatachi,
Any word on whether or not your 4,1 was really able to utilize all of the 8 GB of ram? no kernel panics?