the 5850 is out of date and 2 generations behind. It however offers all the modern gpu features like dx11. It should be very compatible to a 560, maybe slightly slower.
Its a good card for the price if you can get it for so cheaply.
Doesn't make sense why would the price be $40 on that link benchmarking all the cards. I've looked all over the internet and its over $100. I suppose the 560 is the next one thats rated high for its cost. Well thank you for your help anyways