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Go with 2x 3090s instead. 4000 series doesn't support SLI, so you're stuck with the max of whatever one card you get.

If I remember correctly the NVLINK adds 100GB/s (where PCIE 4.0 is 64GB/s). Is it really worth getting 3090 performance (roughly half) for that extra bus speed?

Ampere NVLink (NV3) was 600 GByte/sec, with Hopper (NV4) it's 900 GByte/sec. https://www.nvidia.com/en-us/data-center/nvlink/

That is for the data center NVLINK, according to Wikipedia, for GA102 (3090) it is a 56.25GB/s bidirectional, yielding 112.5GB/s total bus bandwidth.

Ah, that's true, thanks. It's the same type of NVLink as on the A40 GPU. https://images.nvidia.com/content/Solutions/data-center/a40/...

PCIE 4.0*16 is 32 GB/s.

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