Originally Posted by The BugEater
Come now, go the easy way, talk a manufacturer to make a PCMCIAII or USB video card. Now there's something worth paying for...
There are USB video cards but USB does not provide the sufficient data path to handle something like a 7800, those USB video cards are perfect only when you need to use another monitor and you have used all of your computer's monitor outputs but you can only use it for simple tasks, for example holding menus or toolbars.
PCMCIA may not provide the bandwidth needed either as taken from http://www.pcmcia.org/papers/new_bus.htm
CardBus provides a 32-bit multiplexed address/data path, which operates at PCI local-bus speeds of up to 33 MHz, yielding a peak bandwidth of 132MB/sec. CardBus accomplishes this by adopting the synchronous burst-transfer orientation of PCI, as well as a bus protocol, which is essentially identical to that of PCI.
Even though if they make a PCMCIA version it will heat a lot and may need an external case with a cable connected to a PCMCIA card. Still, video data would have to go through a lot of channels and processing which will definitely have a negative impact on performance.
In other words, we're stuck with what we have until hardware manufacturers decide to make further upgrades, and of course, control the heat generated by these cards for use on "older" AGP based mobile systems.