When using two 8800 GTX graphics cards, is it safe to fill the extra PCI slots?

I am looking to purchase a DFI LanParty UT NF680i LT SLI-T2R motherboard, and I have two 8800 GTX graphics cards. I would like to use another PCI slot for my audio card, and maybe a TV card, but am concerned as to the safety of doing so (I don’t want to damage any of [...] http://bit.ly/lUU9LR