Comment by sigmoid10

You can ignore it, the commenter clearly has no idea what they are talking about. PTX is literally the instruction set that Cuda, Vulcan and OpenGL compile to on Nvidia cards in the end. It's assembly for GPUs. And it's infinitely harder to work with. Go to an average technical university and you'll probably find quite a few people who can write Cuda (or OpenGL or Vulcan for that matter). But it would be very surprising if you can find even a single person that can comfortably write PTX.