|Page 17 of your manual states:|
Insert your PCI Express graphics card into slot
Do not install only one PCI Express
graphics card on slot [PCIEXP2], for
such an act will pull its speed down
to x4 only.
My questions are as follows:
What graphics card do you have?
What power supply do you have?
Have you connected the auxiliary power connector/s to the graphics card?
Se the link to the manual for your board.