Not at all...just do a search on google and the differences (if any) are minimal - and not always in favour of the more expensive card! I went for the Crucial R9700Pro and its bloody fantastic. Really very impressive. The only reason why you pay more for other brands is the fancy packaging, 'free' games etc. Crucial give you what you really want (the card) and charge you accordingly.
there is not much difference in the overall design if any... I believe gigabyte and tyan do make minute changes to allow for higher oc's without the 'chatter' that is inherent from oc'ing and the signals generated..
all in all no matter what version of the 9700pro you get... it should be more than adequate... how much it oc's is a different matter apparently.. the gigabyte and tyan ones oc the best AFAIK...
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS