I'm looking at the GTX 1080 or the RX Vega 64

the RX Vega 64 has 2048-bit memory interface
while the 1080 GTX has a 256-bit

My understanding is that's kind of the bandwidth of the card and I'm thinking the RX Vega would be better for a boxer.

Are there any other specs important to boxers that a normal gamer wouldn't care about?

Any input from someone who knows more would be appreciated.