Is 40 Gbps sufficient for modern graphics cards? (I genuinely have no idea, but I know there was a concern that previous versions of Thunderbolt wouldn't have e

Is 40 Gbps sufficient for modern graphics cards? (I genuinely have no idea, but I know there was a concern that previous versions of Thunderbolt wouldn't have enough bandwidth, and it's still a lot less than PCIe x16). It'd be really nice to see Apple get on board with this. I'd love a thin-and-light laptop with the option of a dedicated graphics at my desk.