PCIe lanes =/= graphics. Lynnfield has an integrated PCIe controller. That functionality is thus not required in the northbridge, which reduces the Northbridge's complexity and power consumption.He basically said, Lynnfield is less power hungry in the motherboard, produces less heat and its processor has an all-in-one design for RAM and graphics (meaning less wasted space by having less chips).
However, a discrete GPU is still very much necessary with Lynnfield.