|You should have started your own post.|
That is not your motherboard but specs on your CPU.
I am pretty sure the P3 even a Xenon version if they did actually use both those names on one CPU (I doubt) never was available as a 2.9GHz model.
Anything in the P3 era would NOT have a PCIe port for a modern graphics card but possibly an early AGP port, but you would need to verify this.
Before you stated G41 chipset and Core 2 Duo 2.93GHz which probably WOULD have a PCIe port. You are going to have to post the exact model and make of your machine or motherboard if not a factory built model for any detailed answer.
You WILL need to abandon this and post your own question BUT first gather all of the facts.
You have to be a little bit crazy to keep you from going insane.