MasterP said:
Neither card is worth the price. Neither card is required to get acceptable framerates in today’s latest and greatest games.
IDK what you’ve been offered for the 5970 but when newegg stopped selling them they were around $600 and 6990 should be around $750.
If you actually care about what you’re throwing money at, you can get acceptable framerates, not the absolute BEST but still good enough to enjoy, with a $300 6950 or $200 GTX560.
I figured they were both overrated and overpriced, but so is the Macbook Pro, Hybrid cars, and brand named Polos and I got all of those. Yes I know, I’m a sucker, but i see it this way, it cost more, i use my credit card more, pay everything on time, and my credit score goes up. 820 pretty *edited* good score for a sucker 
anyway i got it for a tad over 300 bucks. comparing just those two, is there any real difference in performance? Obviously the 6990 is better, but my question is how much better exactly? i’ve looked at some comparisons, and the 6990 runs cooler, has a lot more places to plug *edited* in, yet is slightly larger than it’s predecessor. it’s more curiosity than anything.