Does adding a second GPU increase VRAM?
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Solved by Eigenvektor,
No, multi-GPU never increased VRAM, each card still only has access to its own memory. Aside from the issue that modern games typically no longer supprt SLI/CF.
The primary purpose of VRAM is to provide extremely fast access to data. Accessing the memory of another card would be constrained by PCIe bandwidth and would also increase latency.
Even PCIe 5.0 x16 would still "only" provide you with 64 GB/s (modern GPUs use at most PCIe 4.0)
A low end card like an RX 6400 already has 128 GB/s memory bandwidth and when you look at an RTX 4090 we're talking 1 TB/s.
Sharing memory across the bus simply wouldn't make sense for a use case like gaming.
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