No reason to buy any current generation graphics cards from ATI as the Nvidia equivalents are better in every single way, except for the 6990 which is the power hungry power king of today. It's unfortunately also very hot and noisy. I realise I'm quite privileged to have had a play with many cards from both manufacturers over the years and currently Nvidia own the market, even though ATI was yesterday's favourite - cool and quiet while performing great. If you're looking at a 5xxx series ATI versus a 465/470/480 you go ATI, but for that generation the winner for price-performance is always the 460 SLI.