if its an nforce 4 chips set and you have two 16x PCI E slots then YES!
To be honest you should punch your mobos model number in to google to get more info.
But as Perilscope rightly pointed out, your cards must be SLI compatible, to check this look to see if they have contacts on the outermost side for the SLI bridge (which you will also need - and should have been supplied with your Mobo)
