This benchmarks multi-GPU with the RTX 3090 video cards, testing SLI with a new NVLink bridge, an EVGA 3090 FTW3, and an NVIDIA Founders Edition card. It's not easy to set up, but it does work.
Sponsor: Team T-Force Cardea C440 on Newegg (https://geni.us/BaA4jLK)

Watch our RTX 3090 review here: https://www.youtube.com/watch?v=Xgs-VbqsuKo
Watch our RTX 3090 Founders tear-down here: https://www.youtube.com/watch?v=9JWqRjqqNko

The biggest challenge getting SLI to work with two RTX 3090s was aligning the bridges. You really need to get the same card for ideal mating, because the SLI fingers are not standardized for placement and can be misaligned. Because of this, we ran a second test bench (no motherboard on that one) with PCIe risers, then a whole mess of mounting hardware. It took about 4-6 hours to get it all built and functional, but it worked well once assembled. Of course, we would never recommend this setup, but it was a "because we can" and "let's see what it does" approach. Also #ripjay

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