Perfect, that is exactly the information I was looking for. I wasn't sure if the speed increase possible with TB would allow the ExpressCard to hit its absolute maximum performance. If you think that native ExpressCard would receive better performance then I'm happy with that. I'm definitely willing to buy a thunderbolt eGPU chassis, but from what I'm reading, TB is less "friendly" at the moment so given I already have a working ExpressCard viDock I'll likely wait until TB is available on more machines, especially tablet portable machines like my current X230T. My ideal scenario is a Surface Pro tablet with a Thunderbolt port, I desire portability over most other things... I'm considering a more workstation device for the quad cpu and additional physics processing for gaming, but my ideal is still a Surface Pro or ultra thin notebook like Dell Precision 3800 or Lenovo Carbon X1... something like that. Basically I'm just waiting to throw big piles of cash at whichever of these completely inept manufacturers decide to create a half decent ultra-portable machine with a thunderbolt port first.... Just checking I understand this correctly, would the x1 pci-e compression only affect if I wanted to run the card to power the internal laptop screen? Or is it overall for external screen performance as well? If internal screen only I think I can live with that as I've only run it on the internal screen a handful of times. Interesting - it was my understanding that the Latitude E6440 cannot be configured with an ExpressCard? I have even called Dell to query this in the past and they have confirmed that although the website says it is an option - they do not actually offer it. Have you ever seen an E6440 with an ExpressCard slot? I would possibly consider it....