You can do cheaper. I use 1Gig ram, ebay a socket 775 mobo, a shitty 800W psu from ebay and cheap cpu. then bung in a 5850 or two. I got a 2x5850 rig running for under £200
What's the hash rates for two 5850s?I couldn't find any cheap 5850s. However
https://en.bitcoin.it/wiki/Mining_hardware_comparison says that a 6570 has a 124-114 hash rate (not sure the difference between the different listings on that page.) I feel like that number is incorrect though, because a 6570 is $68 on Amazon. Is it because it is low profile? How much does it being low profile effect the performance for mining?