Author: Robert Hyatt
Date: 04:59:47 03/03/00
Go up one level in this thread
On March 03, 2000 at 06:20:18, Tom Kerrigan wrote: >On March 03, 2000 at 03:28:02, Francesco Di Tolla wrote: > >>But Pentiums already had several units on the same die, actually the Pentium was >>a sort of two 486 integer units on the same die. >>Pentium II/III have even multiple FPU units as far as I know. > >At a broad conceptual level, the Pentium has two 486s glued together. > >The problem is that the 486s are running the same program. They grab one >instruction each and try to do them at the same time. But instructions often >depend on each other, so they can't be done simultaneously. > >This design is called "superscalar." It increases performance by (maybe) 50%. > >It's possible to put two complete 486s on the same chip. If you run one program, >it will run on one 486, and you won't get any speedup from the second 486. But >if you run two programs, they each get a 486, so you see a 100% speedup. > >Chess programs can take advantage of extra processors, so if you put four simple >processors on one chip, it would probably run a lot faster than just having one >big processor. > >-Tom By the end of the year there will be more than just AMD. At least two other companies will likely have a product with such an architecture by year's end.
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