what should i go for? the only difference i could see is that the ud3r has x16 (2x16/2x8), and the usb3 has x16 (2x16/1x4) i will not be using quadfire and so on just might add another 5850 gpu as time goes by and add it in crossfire
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I would go with the X58A-UD3R, unless there is a major cost difference between the two boards. The UD3R is the better / more future proof board.