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This item is from the PC Hardware FAQ, by Willie Lim and Ralph Valentino with numerous contributions by others. (v1.25).

2.10 Can I use a x387 with my 486?

[From: Shaun Burnett (burnesa@cat.com)]

No, they are not pin compatible. The 486DX and above contain an on-chip floating point unit. Therefore, a 387 (SX or DX) math coprocessor is not needed. All software written for a 387 coprocessor will run on your 486. If you want a math coprocessor for a 486SX, you need to purchase the 487SX or a 486 Overdrive processor. While we're talking about math coprocessors, I'll make a brief note about the Weitek. Some motherboards may have a socket for a Weitek math coprocessor. These coprocessors are not compatible with the Intel 387 math coprocessor and should only be used if your software requires it. The Weitek 3167 replaced the Weitek 1167 and is for the 386 while the Weitek 4167 is for a 486.

 

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