[terom]

I wonder if that benchmark actually loaded the PCIe bus to any significant degree after the initial benchmark startup, or just updated a couple small parameters on a single scene and thus mainly just tested the local computation on the GPU?

You'd want to somehow monitor the PCIe bus error rate - with a marginal signal and lots of errors -> retries, something that loads the bus harder (loading new textures etc) could suffer way more.

They do briefly show a different PCIe riser made out of generic ribbon cable [1, 3:27], and say that one failed after chaining only two ~200mm lengths. The quality of the riser cable certainly matters.

[1] https://youtu.be/q5xvwPa3r7M?t=207

[Godel_unicode]

You need Steve for that kind of testing, LTT would be busy putting rgb on it and then (badly) water cooling it so they could sell you a backpack with no warranty.