PCI Express x1 Video Card - Should I Bother

I just bought a Dell E310, and to my dismay, my only shot at adding a
dedicated video card is via a plain-jain PCI slot, or a single PCIE x1
slot. No PCIE x16 slot exists on this motherboard!

Question is, I would like to install a military style first person
shooter which is graphics intensive.

Would this be a worthy upgrade over onboard video?

http://www.newegg.com/Product/Product.asp?Item=N82E16814161017R

Thanks.

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