I misunderstood that bit from the Jon Peddie article, the PS1's GPU was indeed a Graphics Processing Unit. Found this hardware overview in one of the Wikipedia

I misunderstood that bit from the Jon Peddie article, the PS1's GPU was indeed a Graphics Processing Unit. Found this hardware overview in one of the Wikipedia sources to confirm: https://archive.org/details/nextgen-issue-006/page/n54/mode/1up https://archive.org/details/nextgen-issue-006/page/n54/mode/...