What means by PCI Express 2.0 x16 : 1 @x4

[Nsync]

What means by PCI Express 2.0 x16 : 1 @x4

 

[FunSurfer]

This means that a graphic card that will be installed on that slot will have only a quarter of the bandwidth of a card on a Express 2.0 x16 @x16 slot. Your motherboard probably has 2 PCI Express 2.0 slots, if you will put 2 graphic cards in both of them, one will run @x16 and the second will run @x4.
More on this subject in this thread: http://www.eggxpert.com/forums/thread/826549.aspx

 

[nikorr]

Its not really designed to run 2 GPU's, but u can use audio card,

wireless adapter or any other PCI card.