Cyrix Corporation was a microprocessor developer that was founded in 1988 in Richardson, Texas, as a specialist supplier of floating point units for 286 and 386 microprocessors. The company was founded by Tom Brightman and Jerry Rogers.

Apr 28, 2021 · Cyrix’s first products, introduced in 1988, were 287- and 387-compatible math coprocessors that outperformed Intel’s equivalent chip. This is ironic, since Cyrix spent much of its life chasing Intel’s floating point performance.

The Cyrix 387DX+ is a CX-83D87 for the European marked, relabeled 387DX+. It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. It also offers the most accurate transcendental functions of all coprocessors and is the 387 clone with the highest degree of compatibility to the Intel 387DX.

Cyrix FasMath CX-83D87 / 387DX+ The CX-83D87 (called 387DX+ in Europe) and branded FasMath, was introduced in 1989. It is the fastest 387-compatible coprocessor, available in 25, 33, and 40 MHz variants, and provides up to 50% better performance than …

The Cyrix 387DX+ is a CX-83D87 for the European marked, relabeled 387DX+. It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. It also offers the most accurate transcendental functions of all coprocessors and is the 387 clone with the highest degree of compatibility to the Intel 387DX.

Mar 7, 2011 · I have run version 19.6 of Fractint on three different FPUs: Cyrix FasMath black-top, i387DX, and ULSI DX2-66. I used fractal image Mandelfn with Video size SF7 (1024x768x256c). All three FPUs took 32 seconds to finish drawing the fractal.

The Cyrix Cx486DLC is an x86 desktop microprocessor developed by Cyrix. It was Cyrix's second CPU offering, released years after selling math coprocessors that competed with Intel's units and offered better performance at a comparable or lower price.

Cyrix 80387 floating-point unit family. FPU » 80387 family » Cyrix. Production floating-point units. Cyrix 387DX-25. 25 MHz 68-pin ceramic PGA. Cyrix 387DX-33 (387DX) 33 MHz 68-pin ceramic PGA. Cyrix 387DX-40 (387DX+) 40 MHz 68-pin ceramic PGA. Cyrix FasMath CX-83D87-16-GP. 16 MHz 68-pin ceramic PGA.

Dec 1, 2016 · I have a motherboard which requires you to set a particular jumper if you are using the 87DLC from Cyrix. If you don't set the jumper, it doesn't work. However, I haven't witnessed any speed differences between the Cyrix 387+ and the older grey-top Cyrix 387's.

It is the fastest 387-compatible coprocessor and provides up to 50% more performance than the Intel 387DX. The 83D87 also offers the most accurate transcendental functions of all coprocessors. It is the 387 clone with the highest degree of compatibility to the Intel 387DX.