Just in case you or anyone else on here is thinking about going the same route as me, I think I've figured out how to tell if the PC has CableCard capabilities. First of all, I looked at the item number that I posted above. It is YN974. I'm pretty sure any XPS 420 that's in the outlet right now and only has 2GB of RAM is NOT capable of doing CableCard. I added one of these with 2GB of RAM and another with 3GB of RAM. The item number for Vista on the one with 3GB of RAM is YN974 (just like the one I ordered) and the item number for Vista on the one with 2GB is DT012. Also, Vista is listed further down in the list when it DOES have CableCard capabilities.
So, as far as I can tell, in order to determine if one can do CableCard you have to add it to your cart and then click on "Detail View" to look at the parts list and look for item number YN974.
Again, I will confirm this when I receive mine which should be Thursday or Friday.
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