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it only needs to be a NVLink The older SLI cable will not work If you hunt around hard enough there are other NVLinks, saw one made by PNY but

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nvlink 3 slot Buy from Scan - NVIDIA TITAN RTX NVLink Bridge, 2-Way with 60mm 3-Slot Configuration, For TITAN RTX Graphics Cards ONLY

nvlink bridge 4slot NVIDIA NVLink enables professional applications to easily scale memory and performance