Two cards necessary with crossfired enable card?

Ceilingcat

Distinguished
Apr 1, 2013
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So I am looking into picking up a Sapphire Radeon HD 7950 card, that is also Crossfire enabled. Which my computer is capable of, actually at the moment I have two 6750s(I believe) crossfired in it. But anyway my question was. Since the 7950 is Crossfire enabled would it still run on it's own fine? I mean I plan on removing both of the previous cards so I can sell them in a pair if I decide to do so. So I will only have the 7950 in there alone. So like I said, I was just wondering if I would have to buy a second 7950 or if it would be fine running alone?