"Graphics Cards (GPU) $1,200 to $1,600 I use four of the Sapphire Radeon HD 7970 at $400/ea or four of the Sapphire Radeon 7950 at $320/ea in each rig. This one with a stock cooler works also, and can be had for only $280 (after mail in rebate). One of the Amazon reviews for the $280 card, shows specific settings for Litecoin mining which is helpful. To answer the 7970 (~$420) vs 7950 (~$320) question, basically, the 7970 gets roughly 100-150 more Mh/s or Kh/s than the 7950 for higher hashing density per rig (see bitcoin mining hardware comparison and litecoin mining hardware comparison). I couldnt decide either and ended up buying both types for my rigs. Either card will work great in this mining rig build."
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Read more:
http://www.coinminingrigs.com/category/mining-rig-tutorials/#ixzz2VXyLQqWZWelcome.