Is 7010's PCIe x16 slot only Gen ? Can I upgrade to ?

Explaining PCIe Slots pcie 2 slot GEONIX GEFORCE GT 730LP 4GB DDR3 Graphic Card 64bit Dual Slot Multiple Outputs- VGA, HDMI, DVI Support PCI-e2 Profile ZORBES® Graphics Card Bracket, pcie 3 slot pcie slot i use, pcie slot sizes Time Stamp

pcie slot splitter Curiously it wouldn't work in the x8 slot I have yet to try this with a top end card When I win the lottery I'll give it a try :-) JR