What Kind Of FPS Will A A8 5600K Give Me WithOut A Graphics Card

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Specifically modern games like BF3 and farcry 3 running in 720p.

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All depends on the RAM..You'll be best going with 8~12Gb of RAM running at 1866Mhz, this will give you about 30-40Fps in BF3 Multiplayer..Not sure about FarCry3.