I run 4k PowerPoint shows on my MacBook Pro Retina machines, bootcamped to Windows10 and Office365. One has an AMD Radeon R9 M370X with 2GB of Graphics memory. I have a similar machine with a NVIDIA GeForce GT 750M, also with 2GB of graphics memory. The AMD is newer but has the same 2.5 Ghz clock speed. I find animations and video smoother on the AMD card. I'm also about to buy new PC laptops, currently looking at anything with the new standard (!?!?) 8GB of video memory. Gamer's laptops are a good place to start looking.