Just for tests, we assembled a “miner” with cheap hardware.Our configuration is consist of
-motherboard ASUSTeK P5KPL-CM
-cpu model name : Intel(R) Core(TM)2 Duo CPU E7300 @ 2.66GHz
-ram : 2x2048mb ddr2 800mhz
-gpu : gigabyte radeon r9 270(2048mb gddr5) costs 341 BGN with VAT included
-power supply : corsair cx600 costs 145 BGN with VAT included

The linux distribution which is used here i BAMT

The mining performance approximately is 400kh/s.