PCI-e white slot?

I noticed that alot of the current 1366 socket motherboards have 2 pci-e blue and 1 white slot. Why is that so? Any difference with the white slot?

I think that the blue ones are PCI-e and the white ones are normal PCI. Can show picture?

I think that the blue ones are PCI-e and the white ones are normal PCI. Can show picture?

it is PCI-e x16.

Other motherboards like the rampage 2 extreme also have the 2blue + 1white format.

I noticed that alot of the current 1366 socket motherboards have 2 pci-e blue and 1 white slot. Why is that so? Any difference with the white slot?

White slots run @ x4

White slots run @ x4

So weird...why like that?

Not even the highly priced rampage ii have 3 pcie x16. -_-

So weird...why like that?

Not even the highly priced rampage ii have 3 pcie x16. -_-

Board complexity. Full x16 requires more data pins and board traces. x16 @ x4 mode requires just power pins beyond the x4 data connections.

Besides, x4 is all you need to initiate CFX/SLi.