AMD Radeon 6950 2GB Crossfire, or single GPU?
As far as specs goes, I think a 6990 would still be faster. High clock speeds on reference boards for the 6990 over the 6950, though I think the difference would really be negligible.
Anyways...
I would do as nixproducer stated and go with a newer card. There's so many ways to debate the topic. Relative performance is in the 780s favor of a 590. Which I'm pretty sure hte 590 is faster than Crossfire 6950s. I'm only using the following graphs as comparisons with the 590 as a 6990. I don't know which of those two are faster.
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_780/26.html
*But by going with a 780, as well, you'd have more vram for higher resolution gaming should you want to upgrade in the future. And then several years later you can continue with the same question. 980 Ti or 780 SLI?
*Single cards generate less heat and will use less power. With your current power supply, if it is still the LiteOn, I wouldn't really trust it to work with such a power hungry system as crossfire 6950.
*You also run into less problems with a single powerful card, which I'm sure you've read on the boards or have seen Linus talk about it in his videos. Like you stated above, there are a few issues with crossfire/sli.
There's gonna be plenty of reasons to go with another 6950 for crossfire as well, but I really say go for the 780 or the 780 Ti if you're able to.
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