I used to shoot 33megapixel medium format cameras 10 years ago, on 8GB machines with 1GB GPUs just fine, doing multilayer photoshop on 48-bits-per-pixel TIFFs.

I used to shoot 33megapixel medium format cameras 10 years ago, on 8GB machines with 1GB GPUs just fine, doing multilayer photoshop on 48-bits-per-pixel TIFFs. 64Gb is completely unnecessary for photography. Photographers don't even go over 16GB.