Uploaded May 2022 | Updated September 2026, 1 week ago

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It is time again to check some 387DX FPUs / 386 Math Co-Processors.
I am using again my M326 v5.2 M/B, this time with a 486DLC CPU.
It is a good idea to first check my original video on this topic:
youtu.be/Tv9LVhlo7EM

Since then my FPU collection has increased by a lot!
Now we have here 12 Differently looking Floating Point Units,
with 6-7 unique performing ones!
Tested all using 6 different specialized Benchmarks.
At 40Mhz and overclocked to the MAX (up to 55MHz).

The models are:
- Intel, i387DX, A80387DX-33
- IIT, 3C87-40
- IIT, 4C87DLC-40
- LC Technology, Green MATH, 4C87DX-40
- ULSI, DX/DLC, US83C87 40Mhz
- ULSI, DX/DLC, US83C87-C 40Mhz
- ULSI, Math Co DX, 9345A3D 40Mhz
- Cyrix, 487DLC, Cx487DLC-33GP
- Cyrix, FasMath, CX-83D87-40-GP
- Cyrix, FasMath, CX-83D87-33-GP-KN

Benchmark results:
docs.google.com/spreadsheets/d/1-ofcQCJH9IbY6TkvRIQnhtK55NbfKOUn/view

Site with detailed information on FPUs:
dougx.net/gaming/coproc.html

-- TIMESTAMPS --
00:00 - Intro
01:06 - The 387DX FPUs.
04:59 - New ULSI FPU, New records!
06:31 - Overclocking Results.
08:20 - Benchmark Results.
13:03 - Conclusions and Recommendations.
14:44 - Outro, Next steps.

I hope you enjoyed this Video...
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