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Here is an LTT video about how many PCI-E extensions one can daisychain without problems.

The limit is around 3 meters.

One should note that it will works way worse with higher pcie versions of today

Are you referring to pcie 4?

The RTX 4000 series uses PCIe 5, and the article references PCIe 6.

I was wondering about that. According to Nvidia RTX 4090 product page, it still used PCIe 4.

Yup, it only uses PCI-E5 power connectors. The GPU is gen4.

A meter of extension adds ~10ns of latency (speed of light).