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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.




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




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