Originally Posted by Cookie092
So therefore, the PCIx1 bandwith will not bottleneck anything.
That's incorrect. Video is never sent back through the pci-e lanes (nor was it in agp or pci before that) that's why the monitor connects to the video card. In the case of laptops, video is passed back through the motherboard simply for the sake of convenience to get the signals to the lcd/ connectors. This is made possible through having extra connections to the motherboard for each of those signals, not by passing any of them through the PCI-e lanes.
It should not be a surprise that you have to use an external monitor with the external video card. Unfortunately the pci-e 1x connection of the expresscard slot is still going to bottleneck any decent card for 3d performance... there is a huge amount of data that the video card and processor must share in a 3d environment. In any reviews of this external system, you'll see that it's being compared to the onboard intel gma950, and that the 7900gs kicks it's butt, but it still stutters occasionally, and they don't give hard numbers. That's because of the bottlenecking of the 1x pci-e connection.