> Anybody have a good coding model (it's whatever language Atmel Arduino uses, by default) that runs on a 5070Ti, best?

Start by asking the model why "whatever language atmel arduino uses" makes no sense.

Atmel is a company that makes chips, some of them are AVR some of them are ARM. The language? well, you can get a compiler and use (mostly) whatever you want, unless you are talking about the machine code.

Arduino is the software platform + dev/prototype board manufacturer.