On: Examining the silicon dies of the Intel 386 proces...

[kens]

But then the 486 DX has a floating-point unit, while the 486 SX does not. So Intel just went with DX is better than SX.

[RachelF → kens]

There were rumours that the DX and SX chips were exactly the same:

Intel zapped the FPU on the SX to disable it. Apparently it cost more to make, but sold for less.

[chasil → RachelF]

The (80-bit) floating point in historic Intel processors is deprecated, FYI.

After the exchange of MMX and 3d-NOW, it was AMD that adopted Intel SSE into amd64.

https://en.m.wikipedia.org/wiki/Streaming_SIMD_Extensions