1. In the link below you may find a helpful article to have a better understanding of the differenceshttps://www.velocitymicro...cklOc1rce-rvJ9Yu14ZE

Keep in mind that we have no specific drivers for the Quadro as some CAD softwares do.
So it all comes down to price and benchmarking. On videocardbenchmark.net (or any other similar site) you can check the rank of the cards you are interested and along with their prices, you may decide what's best for you.
The rule here is the higher the benchmark rank = better performance

2. Capture does not take advantage of multiple cards technologies so one card is good enough

3. Windows or Mac? If you are buying a Mac, I would suggest you read one of our blog post about the compatibility of macOS GPU for our upcoming Capture 2020 release
https://www.capture.se/Bl...OS-GPU-compatibility
If you are referring on the CPU, there is not much of a difference.

For more information, you may visit our Computer requirements section of our FAQ
https://www.capture.se/Support/FAQ

and our general performance advise
https://www.capture.se/Su...Q/Performance-Tuning