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

The PCIe standard doubles the per-lane throughput from the PCIe standard's 250 MBs to 500 MBs This means a 32-lane PCI connector

PCIe x16 Gen expansion backplane with two slots The PCIe x16 Gen3 backplane has two PCI Express x16 slots, with one slot supporting the OSS target

pciex1 slot EZ-Latch Plus：PCIe x16 slot & slots with quick release design; UC Ultimate Scalibility: 3*PCIe x16 slots for Multi-GPU and 4*PCIe x4 slots

pcie x4 in x16 slot List of Motherboards with 2 PCI-Express x16 Slots: ASUS TUF Gaming B760M-BTF WiFi, ASUS TUF Gaming Z790-BTF WiFi, MSI B760M Project Zero, GIGABYTE Z790