A:AnswerUnless you are a *super* enthusiast, there's no major out-of-box performance differences between any of the various 4080 brands or models.
Some can be overclocked (given more power) to perform better than "stock" but that gets into territory that is far too deep a rabbit hole to discuss here. IMO - but the cheapest 4080 you can find from a brand you trust.
A:AnswerYou need 3 8pin PCIe connectors.
These cards should all come with an adapter for 12-pin GPU to [3] 8pin PCIe connectors.
Ideally you'll want 3 individual 8pin PCIe to 8pin PSU cables (one for each on the adapter) - but from what I've read nobody has had issues using only 2 (one cable for one adapter and then a 2nd "daisy chained" for the other 2)
