Some laptops have two NVMe slots. It's definitely more efficient than thunderbolt, but the fact that you have to find a way to connect it seamlessly and you are reducing your internal storage potential makes it only a good solution for the edgiest of cases for an eGPU solution. Maybe if you are not planning on using your laptop outside of the desk at all or can modify it to connect it. Like I said it's SUPER edge case. I'd take the thunderbolt performance hit over this any day of the week over having to find a way to modify my laptop to do this while actually still being able to use it as a laptop properly. TB4 SHOULD be a little better since it can use 32Gb/s fully if the device is also TB4 controller but that's all theoretical right now there's no TB4 eGPU devices.You sacrifice a M.2 slot for a GPU, so you can play games that reside on SATA Drive ? And I still think that SATA Drive is the slowest component in the laptop, apparently I'm so wrong.