Using that adapter for GPU intense applications sort of defeats the purpose of having a High End Video card.

Most notebooks use a rather slow bus speeds and high processor stepping. The slow bus is the one reason that it is considerably slower than if it was on a desktop board.

If you want to use a notebook with a High End GPU, get a notebook that already has a High End GPU in it. High End GPUs in notebooks will never be as fast as a desktop, but one that has it built in will not loose as much as going external. If you do get a notebook with a decent GPU, make sure it has dedicated memory for the GPU. Shared memory will be DDR3, which is considerably slower than dedicated DDR5 video ram.

The video mentions checking to see if it is compatible, which means that there are probably more systems out there that it wont work on than ones that it will.

The other reason it is slower, has to do with the PCIe differences.

Very few notebooks have true PCIe slots. Most have ones that are variations of PCIe that do not match the PCIe standard. PCI express Mini is usually just a nerfed pci slot and a usb slot in the same plug. Some are a mix of sata and PCIe. Some are so proprietary, that nothing will work in it unless it is designed to.

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