3gb
The sim uses over 2.4 gb of vram when I play online at times @ 1080p with all settings high except ssao (fps drop near ground). That being said a 3gb card might not work all that well unless the rest of the system is up to the task.
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ASUS Sabertooth MB--Intel 2600k@4.7--EVGA GTX580 3GB--Corasir 1200 watt psu--Corsair 16gb 1866--Corsair H70 cooler--Corsair 650d case--OCZ Vertex 3--Track IR5--CH Eclipse Yoke--CH Trottle Quadrant--CH MFP--CH Rudders-MSFF2
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