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Yield and reticle size! You can have more chiplets in your processor, but the manufacturing process won't let you make one really big monolith. You can have s
by tux3 5y ago
Yield and reticle size!
You can have more chiplets in your processor, but the manufacturing process won't let you make one really big monolith.
You can have something like Cerebras' wafer-scale chip. It's a whole wafer!
But with that approach you still really have a network of identical processor subunits, not one big processor.
- kurthr 5y agoAlso, for a given resistivity/dielectric and thickness Resistance and Capacitance also scale with length. That means that RC settling time goes as length squared (width roughly cancels since R goes down while C goes up)... ignoring any transistor scaling, just the wiring limits speed very quickly. Reticle size (limited by lens DoF) is roughly 30mm square, and GPUs have been close to that for years.
- deleted 5y ago[deleted]