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They don't come worth one.
Also the 3090 uses NVLink not SLI so if you do need a bridge it's an NVLink one you need.
As the title really. Or do you have to buy one separately?
NVIDIA NVLink 2021 Update and Compatibility Chart
https://www.pugetsystems.com/labs/articles/NVIDIA-NVLink-2021-Update-and-Compatibility-Chart-2074/
Basically the A6000 3 slot and 2 slot NVlink bridges will work on 3090s in SLI too. So now you can SLI without a 4 slot space motherboard with the A6000 bridges. (but make sure you have good air flow if not using blower 3090's or water cooled). 4-slot spacing is fine with air cooling FE or AIBs that are none blower, but make sure case has good air flow).
NVIDIA GeForce RTX 3090 4-slot and RTX A6000 2-slot NVLink Bridges
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Just some quick pictures, it's still not all done yet I need to plug the soundcard in with a riser and mount it vertically and plug all the drives in on the sata side and add a large fan near the gpus to blow cool air over them and other things yet. I will update it when it's all done, just have it setup on the floor for now so I can atleast do my work on it and when I have a moment to finish off bits. So far working great and doing what I need it to do. Also need to tidy the cables and wipe my paw prints off the oled screen on the mobo and the cooler, stick the side panels on etc etc etc.. The light show is on just for you guys the lights are normally off and the case has no side panel you can look threw anyways.
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@Purgatory I think.