Hello . My rig is a core 2 duo 2.93 ghz processor , 6 gb ddr3 1333 mhz ram , 450 w power supply , 500 gb harddisk , 20 " monitor , i play games at 1600x900 resolution my psu has only a 4 pin aux power cable , which is the best graphic card which can support this rig without bottlenecking , which should run metro 2033 like games atleast at high settings . I was thinking of buying radeon hd 7750 or hd 6790 or nvidia gts 450 . Which one is most suitable . Any other recommendations ?
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