Sapphire wins IMHO, you can OC quite well 'either' card stably but [ASIC] quality # (volt leakage) of the gpu chip itself will dictate how hot it will run before crashing. You can't read the number of any card until it is running. A 7970 owners club had a poll & Sapphire had higher asic # but not by much. There is a school of thought that says the ## mean crap. Either card you can't loose.
p.s Why a 32 bit OS? consider win 8-64
Thanks for the quick reply. I'm definitely getting the sapphire now. Thanks for the little note too, the person who built my computer had to make a cut somewhere for price
. Would you recommend windows 7 64 bit or windows 8 for everyday gaming. Anyway thanks for the reply!