How do i find out which version i have ?

Leopard 10.5.2 AMD EFI Rev.2 Zephyroth or Rev.1 ? Cant seem to get my ati x1300/x1550 to run stuck at 1024x768 resolution
everything else seems to be ok. So i thought maybe i dont have the right version. ? i downloaded Leopard-10.5.2-AMD-EFI.iso and looked on newsgroups for any other version. does anybody know where i can find the right version ?

Thanks

Rob