I've been working recently on a Supermicro X9QR7-TF+/X9QRi-F+ server. I took the user's manual and saw two things: the chipset is Intel C602, and the expansion slots are PCIe 3.0.
According to Intel's website C602 chipset supports PCIe 2.0.
Furthermore, the user's manual states:
The C602 chipset provides extensive IO support, including the following functions and capabilities: (1) PCI-Express Rev. 2.0 support (2) PCI-Express Gen. 3 uplink supported by some SKUs
What does "uplink supported by some SKUs" mean? So does it support Gen3 or not?