Ok, but if you had 5 x4 drives before, one got full bandwidth from the cpu x4, and the other four would share (equally, I guess) on the chipset x4. Now, you'd get two on the uncontended cpu x4 lanes, and the three sharing (unequally, as you mention), seems slightly better that last time, but not an 'unusual departure' from the previous design; the CPU to chipset link is still very oversubscribed, but now, you can add a second oversubscribed chipset if you want, instead of having a choice between chipsets with different levels of oversubscription (or no chipset, only available in boards that don't expose most of the lanes)