70% will leave residue. Get the 90%  probably 50 cents more. 
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Gigabyte 880GA-ud3h / 3.1 Phenom II x2 550 BE Callisto(4 cores and OC to 3.4) / Corsair Vengence 2x4gb DDR3 1600 / 640gb WD Black 2ea./HIS 6870/ 650 EarthWatts / Win 7 64bit
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