I was just wondering , seeing those many mining PC with many grapchi cards, where do they connect the graphic cards on that motherboard ?

To what kind of slots can you connect a graphic card on a mother board and can be used to mine ? Can you connect to a PCI , PCI-e X1,X2 X4 , X8 , X16 slot ?

Doesn't this affect the MH/s if you put a graphic card that should be on a PCIe X8 / X16 on a X1 slot ? The transfer speed is 8 to 16 times lower .