This mobo will ony take the Pentium P4 500 series LGA775's. I'm not sure if they are 32bit or 64bit but they are getting pretty rare now. Overclockers still sell them. click here
As it has an AGP slot as well as a PCI-Express slot, you can use your current AGP card then replace it with a PCI-Express card, but you can't use both at the same time.