You are underestimating the bandwidth used by video cards... "Keep in mind that high-end video cards are PCIe 3.0 x16 which transfer at 128Gbit/s (16 GB/s)". Far outstrips what your network could do, assuming you saturate the link. (Plus, ethernet does not go at 100% capacity...) And the latency inherent in shovelling the video over a network link is far larger than pushing bits on the local PCI bus.
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