Chip dicing hardware can produce hex-cells, or any other cell with straight edges. (Not circular - that's not a good shape to expect from crystalline silicon.)
But - as you say - the modular sections are rectangular, and for most applications there's no good reason to make the dies any other shape.
There's actually a patent for hex-cell chips, but it doesn't seem to have been used for any significant projects.
But - as you say - the modular sections are rectangular, and for most applications there's no good reason to make the dies any other shape.
There's actually a patent for hex-cell chips, but it doesn't seem to have been used for any significant projects.
https://patents.google.com/patent/US6030885A/en