hey, if ur getting the 955 be with a gigabyte MB your gona have to flash the bios, and there "in windows" bios flasher tool sucks balls... so your going to have to use q-flash in the boot menu. but not that big of a deal....
if you dont flah your core speeds will be 1.62 ghz (core 0,1,2,3) or 1.62(core 0), 800mhz (core 1,2,3).