Some guy is selling 2 MSI GTS 250s for $100 on craigslist. Is it worth it and how much of a performance increase would I get compared to my single Radeon 5770?
2 gts250's would be faster es, but if you already have a 5770, then get another 5770. Would not replace it with 2 unknown condition, used gts250's. If you had a much lesser card, i would say go for it, but you already have a reasonable card.