sorry fellas for askin this stuipid question what is pcie 2.0 and pcie 3.0 slot i know it is a slot where external graphic cards are inserted. is there performance diferrence between these two figures or its just the size as im a begginer i need to know all these. MY SYSTEM CONSISTS OF AMD FX 4100 3.6GHZ PROCESSOR AND ASUS M5A78L-MLX MOTHERBOARD PLEASE TELL ME WETHER THIS BOARD WILL SUPPORT SAPPHIRE HD68501GB/ HD7770 1GB OR WILL IT BE BOTTLENECK IN MY SYSTEM