I noted in Phil's VGA Benchmark charts that the DX appears to be significantly faster than the SX at the same clock speeds. Is this primarily due to the 32 vs 16 bit data bus, 4 vs 2 byte prefetch, or both? I'm not at all familiar with these processors other than what I've read up on them online. I've only ever owned an Intel 386SX-20 (my first PC) and quickly upgraded to a 486, so my experience with the 386 is very minimal.

Would one expect a similar difference in performance between an Intel 386SX-33 and 386DX-33? In other words, do they share the same 32 vs 16 bit data bus and 4 vs 2 byte prefetch differences?

What is the relationship between SX, DX, and a math co-processor? From what I've gathered, at least for a 386, DX does not equal math co-processor--you could have a math co-processor with either an SX or DX? Is that accurate?

Thanks!