NVIDIA's quad-slot GeForce RTX 4090TiTITAN 800W graphics card

NVLink is the world's first high-speed GPU interconnect offering a significantly faster alternative for multi-GPU systems than traditional PCIe-based

These 2-PCI-slot blower-style RTX 2080 TI GPU also will work: 1 Asus WS X299 PROSE which is also by the way a SSI CEB with 4 PCI-E x16 Slots

4 slot long toaster the PCIe slot There are essentially four types of PCIe slots differentiated by their lane count

40 chilli fruits flaming edition slot GPU's with waterblocks are even narrower, generally a bit more than 1 PCIe slot wide You have three options for a 4 GPU rig, blower style GPU's