I did find some RTX 2080 Ti benchmarks that compare NVLink vs. no NVLink performance, like this one https://technopremium.com/blog/4x-rtx-2080-ti-with-quadro-nvlink-performance-test/

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However, I did not find a benchmark so far comparing PCI-E 8x vs. PCI-E 16x performance and if NVLink could lessen a potential bandwith problem when using PCI-E 8x. Does anybody know about such benchmarks? Or do you have a system like that and could share your experiences?

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Many servers nowadays have single or dual root PCI-E solutions to host 8, 10, or even more GPUs with PCI-E 16x, but for workstation boards you often only have 4 usable PCI-E slots (given dual-slot GPUs) and only 3-4 slots with real PCI-E 16x.