A few years ago, at a computer "show", really more of a sale than a show,
in Atlanta, I bought a Motherboard which contained an Intel RapidCAD
386/40 processor. In the 40MHz version, you got an 80386DX/40 CPU with
quite a bit more internal cache than Intel's normal 80386DX processors,
paired with an 80387DX/40 co-processor which had, either 32KB or 64KB of
internal cache, I forget which, and claimed to be the equal of the old
Weitech floating point scientific math processor chips in floating point
calculations. The board also had sockets for 256K of fast cache chips,
and 8 sockets for 30-pin true parity SIMM sticks. It had 7 16-bit ISA
slots and the whole thing was packaged on a board not much more than 8
inches long and wide.
Intel produced this RapidCAD chip pair in 33 MHz versions as well. I
never heard of a 25 MHz or slower version. This Intel setup, thanks to
its internal caching and 40 MHz processor clock speed, was the fastest
80386/80387 pair ever made. In their day, they were the heart of serious
high-end workstations, and could easily swing with most 80486 systems
available at the same time, at least until the 80486 became available in
50 MHz and DX2/66 versions or faster.
Brent Reynolds
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