The better processor is the A4, but as black_zion said, you better give us some model names so we can recommend one.
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#1: Phenom II x4 B55 @ 3.8ghz | Gigabyte GA-MA790FXT-UD5P | Sapphire hd4870 512mb | G.Skill Sniper 2x4gb | Antec 900 | Corsair TX750 | Samsung P2350 1920x1080
#2: Athlon II x2 240 @ 3.5ghz (250x14) | Gigabyte GA-MA785GMT-UD2H | G.Skill NQ 2x2gb | Coolermaster Elite 335 | SeaSonic S12II-500 | Samsung T220 1680x1050