Wait a second—a new peripheral for the Mac Pro? It’s been ages since we’ve seen virtually anything designed for Apple’s workhouse tower, but NVIDIA apparently hasn’t given up on the big old Mac yet. Announced today and coming later this year is Quadro K5000 ($2,249), one heck of a graphics card. It retails for just a few bucks less than the base Mac Pro itself, bringing improved performance and 4K video support to the…