Aui wrote on 2024-10-03, 11:40:
Well, a 386 Dx 40 with cache is about as fast as a slow 486. And this is where the original question becomes a bit difficult to answer
https://dependency-injection.com/the-slowest- … vs-fastest-386/
Speaking of 386 PCs, I think that there were about three popular categories.
(In addition to XTs @4,77 or 8 MHz, which were the baseline systems in 80s.)
286-12
am386DX-40
486DX2-66
Popular in the sense that they were the working horses of their day.
12 MHz was a stable, usable clock rate for many 286 chipsets.
It was fast, but could be paired with medium-fast SIMM modules (70ns, 80ns).
The 386DX-40 by AMD was a static CMOS design and was the basis of many compact BabyAT motherboards (486DLCs used by enthusiasts).
It didn't have any special requirements and was a solid performer in the office under both DOS and Windows 3.
It was the final expansion to 386 chipsets (intel topped out at 33 MHz).
The 486DX2-66 was an unproblematic drop-in upgrade to existing 486DX-25 or 486DX-33 PCs. It was 5v tolerant and didn't require special BIOS support yet.
Many existing 486 PCs were upgraded to an 486DX2-66, way back to the first models from 1989.
The 33 MHz bus clock was very compatible, VESA Local Bus included.
Edit: I'm speaking about Pre-Pentium here.
In Pentium era, the Pentium 90 and the Pentium MMX 166 were notable.
Or so I think. It's more of a gut feeling here. 😅
The Pentium 133 was often seen, too, but I'm not certain.
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