Because it is positioned at the lowest price range for P67-based motherboards, the manufacturer had to cut costs somewhere. The main disadvantage of the ASRock P67 Pro3 compared to other mainstream P67-based motherboards is the presence of only one PCI Express x16 slot. This should not be a problem if you are an average user, but if you plan to add a second video card in the future to improve gaming performance, you will need to pick a different (and more expensive) product.
If you install a dual-slot video card in the PCI Express x16 slot you will “kill” one of the PCI Express x1 slots.
The motherboard has three PCI Express x1 slots and three standard PCI slots.
It is important to understand that the P67 and H67 chipsets don’t support standard PCI slots anymore, and the PCI slot is provided by an ASMedia ASM1083 bridge chip.