Produced by Chips & Technologies, this was the latest entry into the 387-compatible marketplace. Originally announced in October, 1991, it had apparently not been available to end-users before the third quarter of 1992. The product was discontinued after only a few month since C&T stopped all work on their CPU and coprocessor development.
Compatibility with Intel products is very good, even for the more arcane features of the 387DX and comparable to the coprocessors from Cyrix. Overall, accuracy of the transcendentals is slightly better than on the Intel 387DX.
The C&T 38700DX showed performance at about 90- 100% the level of the Cyrix 83D87, which is the 387 clone with the highest performance. For floating-point-intensive benchmarks, the C&T 38700DX provides up to 50% more computational performance than the Intel 387DX. However, as with all other 387 compatible coprocessors, the speed advantage over the Intel 387DX is far less significant in real applications.
The SuperMATH 38700DX is implemented in 1.2 micron CMOS with on-chip power management, which makes for low power consumption. The 38700DX is packaged in a 68-pin ceramic PGA and available in speeds of 16, 20, 25, 33, and 40 MHz.