| Did you know?
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| 386 Math coprocessors used a 68 pin socket which was installed on the motherboard. The Weitek 3167 and Cyrix EMC coprocessorscould only be used with motherboards with an 121 pin Extended Math Coprocessor Socket, EMC.
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| Coprocessor articles |
| Introduced | : | 1991 by Intel | | Manufacturers | : | Intel | | Adress / databus | : | 32bit / 32bit | | Performance | : | ~1.200.000 FLOPS | | Package | : | 169pin PGA | | # transistors | : | ~1.2 million | | Manufacturing process | : | CMOS | | For use with | : | 486SX | | Frequency | : | 25MHz | |  |
Intel
- A80487SX
Weitek
- 4167-33
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![](javascript:openImageWindow("http://www.cpu-info.com/img/cpu/80487/Weitek4167FL.jpg","Weitek 4167-25"))
![](javascript:openImageWindow("http://www.cpu-info.com/img/cpu/80487/iA80487SX-SZ494-USAL.jpg","Intel 80487SX"))