The most reliable way to determine whether your hardware model has UGA or GOP is to select "About rEFIT" in the rEFIt boot screen.
http://refit.sourceforge.net/ You will see an output like this: EFI Revision 1.10 Platform: x86_64 (64 bit) Firmware: Apple 1.10 Screen Output: UGA Draw (EFI 1.10), 1440 x 900 - or - EFI Revision 1.10 Platform: x86_64 (64 bit) Firmware: Apple 1.10 Screen Output: Graphics Output (UEFI), 1440 x 900 >From my experience, models released after 2008 (MacBook5 and higher) should have GOP. Beware that on some Mac models (eg MacBookPro8,x), suspend/resume only works when none of efi_uga and efi_gop are used
