AMD made a real flash with their 386 DX40, that's probably what you got.
My first major upgrade (of dozens) to the only computer system I ever bought new/complete, a PC Brand 286/12 in 1988. I had bummed around on a roomates Apple 2 and a friend's PC for some years previously. The final piece of that old machine, the long unused 5 1/4 floppy, was dropped in the late 1990s.
In fact, I came across the invoice for that first big upgrade a month or so ago:
1992 prices
4 1meg SIMMs: $156.00 ($39 ea.)
MAHA 386/486 Syphony MB (w/6 ISA slots!): $260.
AMD 386-40: $110
All purchased from vendors in Computer Shopper. Too bad it was killed (functionally) by the Internet.
Charon