NVIDIA T400 4GB

The Gen3 4U Value 10-Slot connects your computer with up to 10 PCIe x16 interfaces through 2 PCIe x16 host connections The system supports up to 8

Actually, you can install your ssd in the _1 slot and still have your gpu run at x16 as AlderlakeRaptorlake cpu's have 20 pcie lanes or 16 pcie

pcie 40 in pcie 30 slot — The most common use for a PCIe x16 slot is a graphics card, or GPU Heavy PCIe Gen 3, requiring PCIe or newer: GPU, Required PCIe Gen & Lane

pcie x1 slot function PCIe Gen : 210 mm, 175 mm, 270 mm, 385 mm, 440 mm PCIe standard PCIe Gen PCIe Gen 3 slots with extra feet With horizontal SFF GPU