Hi Simba, i have a similar M/B sb600, it takes the same amount of time to install on my machine although i dont get the 4 minute bug..with regards to EFI just make sure you select the 9.2 kernal in custom options, and thats it. i must say zephyroth 10.5.2 with efi is much quicker than 10.5.1.. sorry i cant help on the graphics as i have ati x1650..

Firewalk