Pcie: What is PCIE & How it works PCIE Uses

There are 2 PCIe x16 slots on the T7400 Motherboard So if you only have the Graphics card in 1 of those slots then the other should be free

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

pcie x1 in x16 slot - HP Z Turbo Drive Quad Pro with 2 ssd installed in slot 3

pcie 2 slot 2 InfiniBand networking, which accelerates communication by every GPU across nodes; PCIe Gen5; and NVIDIA Magnum IO™ software delivers efficient scalability