Why bother with them though? I can't come up with any reason I would use a 7990 over 2 7970s for mining. 5970s had some merit since it was easier to build high density rigs when a single 5870 only pulled 150W or less. But considering how well 7970s OC and how much power they take up when you do, what exactly is the point of using a 7990? Also add the fact that the 79xx cards have problems with leakage increasing (A LOT) at moderately high temps 70-75C+ and it becomes even less attractive.
If someone says "better binned chips" just no, go get 3x 7950s (almost 4).
because I can... and it may not be used for mining only, did you consider that? what people do is their business.
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