Yes, it is called SLI.
You just have to have a sli capable motherboard.
Which yours isn't.
radeon = ATI
geforce = NVidia
and by the way, you CAN have dual 7950gt video cards with that motherboard... you just need this
http://cgi.ebay.com/ASUS-NV-SLi-Bridge-Flex-M2N4-SLI-31_W0QQitemZ230066335279QQcmdZViewItem
(it fits all motherboards)
and some hacked geforce video drivers.
Don't get that. it looks pretty sketchy to me. Something tells me it is a DIY kinda SLI, which you can't garuntee if it will work.