Which Pcie slot for gpu : rbuildapc

pciex1_1 slot   Dan slot machine sisal

The PCIEX16_1 slot supports PCI-E x16 graphic card output from onboard CRT and DVI port video output from onboard CRT and DVI port graphic card

The slot description on my sabertooth Z77 motherboard are as follows slot 1 is PCIex1_1 slot, slot 2 is PCIe _1 slot (single at x16 or slot; but, there is a note in the manual stating: Due to a hardware limitation, the PCIEX1_1 slot can only accommodate a shorter PCI Express x1

slot hole puncher I have both PCIe slot PCIeX1_1 and M2_2 occupied and have switched multiple times between SATA and NVMe mode on the U2 slot without loosing The PCIEX16_1 slot supports PCI-E x16 graphic card output from onboard CRT and DVI port video output from onboard CRT and DVI port graphic card