I am currently using a sapphire Radeon 5970. I am looking at maybe performing an upgrade and am looking at either adding a second 5970 or moving to the 7990. Any ideas?. My system used the i7 on a MSI big bang motherboard.
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If you can afford it, the 7990 is the better option. It will be a much greater performance increase than adding another 5970.
dont get the 7990 (go with the r9 280x) unless you're running more the two monitors. CF has a lot if issues atm so if you can go with nvidia if you really want to run duel GPUS