Geovision has the capability to stack multiple cards (up to 2) in the same computer to expand the number of camera channels the DVR supports. There are certain requirements that must be met in order to use more than one Geovision card in one PC. Please refer to the this document for the system and card requirements and versions that are supported.
http://videos.cctvcamerapros.com/pdf/geovision/instructions/Geovision-Multiple-Card-Installation.pdf
