Gen4 nvme on PCIe 3 slot - ROG Forum

Building a Multi-GPU Deep Learning Machine on a budget pcie 4 gpu in pcie 3 slot PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots are associated with graphics cards and provide the highest bandwidth available pcie 4 in pcie 3 slot ssd 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

pcie 4 slot DPX instructions comparison NVIDIA HGX™ H100 4-GPU vs dual socket 32-core IceLake For LLMs up to 175 billion parameters, the PCIe-based NVIDIA H100