Part of the chipmaking process is burning layers into wafers covered in photoreceptive material. Photomasks/reticles used to cover entire wafers making many units at once, but now the processes are so small they have to compress the image (4-10 times is typical), burn a couple units, step over repeat on the same wafer. This GPU is so large, they can only fit 1 of them in a single burn step.

It's something along the lines of the film size for the super fancy camera they use in one of the steps. (The silicon wafer would be the equivalent of the entire roll of film.)

193i immersion steppers,a la ASML have 32x26 as the reticle limit