Hi guys i am looking everywhere but cant find the answer i have Dell 7910 with one installed cpu 6 core and one empty cpu and 16 gb memory i have gtx 770 and quadro 5000 installed in the bottom of my mother board

My question is can i install second gtx 1060 6gb on on the top pf mother board with 2 free PCI 3 3 16 slots without hawing second CPU installed or do i have to have second cpu installed in order to run another gtx

when i am looking at the spec of my MB it say PCIE cpu1 and PCIE cpu 2 i am thinking i do need second cpu installed to use PCIE cpu2 slots

Thanks