See this page on the aircrack-ng site.
http://aircrack-ng.org/doku.php?id=c...bility_drivers
Start at the section (near the top) titled Determine the Chipset.
This has lots of resources and will help you to determine the chipset of your cards.
Generally you will need to view the results of a lspci command or lsusb
two v's for very verbose output#lspci -vv


