Why don't CPUs keep getting bigger as they get more powerful, but have different sizes

[SetSakara2]

I had a random thought, but why don't cpus get bigger as they get more powerful? The AMD R3 1200 has the same size as the R9 5950X, but yet the 5950X is much more powerful. An intel 7700's size is a little smaller than the 12900K, even though the 12900K is much more powerful. Intel Pentenium sizes haven't changed much. Server CPUs have a lot of differences. AMD Opteron series is half the size of a ThreadRipper series CPU, but not half the performance. Why?

[emosun]

Its been explained several times that yeild sizes reduce the larger the chips are physically.

 

Less yeild means a higher end user cost while not being any faster than just using chiplets

[CommanderAlex]

Most likely, the number of defective big chips on a single wafer are too costly and are unprofitable to produce in a mass production scale.

 

Just think why AMD uses chiplet designs for their high core count Ryzen, Ryzen Threadripper and EPYC lineups with multiple chiplets. For example, one big die is the equivalent of 4 chiplets, would you rather take a defective big die or 3 out of 4 chiplets as 1 of them is defective? This is why AMD is able to give more and more cores compared to Intel right now. Compare this to say an Intel HEDT chip at the time of 18C/36T, and the die size grows as well as costs. You can't nearly get the same amount of huge monolithic dies from a single wafer as say small chiplets on a single safer due to yields. 

[AbydosOne]

5 minutes ago, SetSakara2 said:

I had a random thought, but why don't cpus get bigger as they get more powerful? The AMD R3 1200 has the same size as the R9 5950X, but yet the 5950X is much more powerful. An intel 7700's size is a little smaller than the 12900K, even though the 12900K is much more powerful. Intel Pentenium sizes haven't changed much. Server CPUs have a lot of differences. AMD Opteron series is half the size of a ThreadRipper series CPU, but not half the performance. Why?

Two answers:

1. You need to standardize the socket/ILM/heatspreader size at some point, so different CPUs in the same line can fit in the same motherboards, even if they have wildly different compute ability.
2. In terms of "over time", they've been shoving more and more into less "area" of the die by decreasing the size of the features of the chip. That's the "nanometers" you hear tossed around. That number (generally *glares at Intel*) decreases over time, allowing more CPU per square unit.

[emosun]

But as an addition , you might want to watch a few videos on how computer chips are made as it would easily explain why physical size has no relation to speed

[mononymous]

I would recommend Asianometry's videos. His videos explain how processors are made, the development history as well as the current limitations in production. For example here's a video on why AMD's chiplet products (EPYC, Threadripper, Ryzen) were developed compared to their previous gen products.

 

TLDR is in order to make the performance of the cpu increase year on year, making a chiplet design was cheaper than using previously used manufacturing methods.