Is it 9G55 (normal) or 9G66 (new retail disks). Or is it something else? I'm wondering if the magic support of 8GB is due to the PAE support being a little sketchy in the older laptop drivers. If it has a different build, it may have a newer driver for the 9400M, and COULD mean (emphasis on "could") 8GB RAM support will come to the 15in'ers and MacBooks in 10.5.7. Also, if my theory is technically off-base somehow, please let me know. I'm just a hobbyist, not a programmer.