It would be terrific if you can upgrade Parallels Desktop for the Mac to fully access the MacBookPro graphics cards. Currently, the only way to do this is to boot directly into Windows via a BootCamp partition.
Hi bobpetersen, This type of configuration isn't currently supported by Parallels Desktop for Mac. Thank you for your feedback and Parallels Development Team is always looking at different ways to keep improving the product. Thanks, Manoj.