Processor Types and Specifications - Upgrading and Repairing PCs - page 107

tionsinfewercyclesthanpreviousdesignsdid.Onaverage,themathcoprocessorbuilt
intotheDX-series chipsprovidestwotothree times greater math performance thanan
external 387 math coprocessor chip.
The 486 chip is about twice as fast as the 386 at the same clock rate. You can see why
the arrival of the 486 rapidly killed off the 386 in the marketplace. The die for the 486 is
shown in Figure 3.20 .
Figure 3.20 486 processor die. Photograph used by permission of Intel Corporation
To learn more about the 486 processor family and the 486-based AMD 5×86, see Chapter
3 of Upgrading and Repairing PCs, 19 th Edition ,availableinitsentiretyonthediscpack-
aged with this topic.
P5 (586) Processors
Afterthefourth-generationchipssuchasthe486,Intelandotherchipmanufacturerswent
backtothedrawingboardtocomeupwithnewarchitectures andfeatures thattheywould
later incorporate into what they called fifth-generation chips .