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.

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.

2016年12月1日 · I have witnessed some compatibility issues with certain programs when using an SXL2 and the older grey-top Cyrix 387's. The best I've received in Quake is 3.1 fps with an SXL2-50. Plan your life wisely, you'll be dead before you know it.

2021年4月28日 · Cyrix was founded in 1988 by Jerry Rogers and Tom Brightman in Richardson, Texas, a suburb of Dallas. Its first chip, released in 1989, was a 387-compatible math coprocessor that was up to 50% faster than Intel’s chip while costing less. Rogers assembled a team of 30 engineers, most of whom came from Texas Instruments.

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.

2013年1月31日 · I'm interested in benchmarks of different 387 FPUs - IIT, Cyrix Fasmath, Intel, ULSI... If anyone can do and post benchmarks. I usually use Checkit V3.0 and NSSI V0.59 for Whetstone benchmark.

You're welcome to post suggestions, corrections, your own personal review, or your experience with the floating-point unit. Please do not ask upgrade and troubleshooting questions, and do not start discussions.

Designed by Deksor, computerguy096 and Zago. (c) 2019-2025 All wrongs reversed.

2011年3月7日 · 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.

2018年2月21日 · Via now uses the name as a CPU name (not making it clearer), but this section is about the original Cyrix CPU's. The processors supporting CPUID call it "CyrixInstead". Cyrix 387. This isn't actually a processor but an FPU. It was the fastest coprocessor to the 386 to be found, and was even very usable aside a 486-SX. Cyrix 4x86