Originally Posted by DNMock
Software side. The software (games) still recognizes each chiplet as a different gpu. Using the same Ryzen approach they are unable to homogenize it so that it is recognized by software as a single unit. That's why Navi is monolithic instead of using chiplets.
Gotta backtrack now a bit. 8 200mm chiplets would be way too huge.
Here is scaled up image of about what 6 chiplets at 200mm^2 would look compared to a Volta Tesla GV100 and lol, it's stupid huge.
You don't need to backtrack, after all your baseline GPU block was entry level, not a ~200mm² block, which is usually in the mainstream/mid-range (GTX 1060 / RX 480).
You take the 1050 Ti, which is 132 mm² or go even lower, the 1030 is 74 mm². Ideally, something in between, at ~100mm². If you put 8 together you get a chip around the size of the Titan V, but since you have freedom to scale and cut from wherever you want on the wafer, it would be much cheaper to get to market.
Edit: This approach needs a chiplet design though, but it's easy: you make wafers filled with memory controllers + video decode/encode block + video output block + PCIe interface.
Edit 2: And as a bonus, GPU makers can do like AMD is doing with Zen 2, make the chips that contain the memory controllers + video decode/encode block + video output block + PCIe interface on an older node, for even lower costs and better yields.