486 DX2 - definizione. Che cos'è 486 DX2
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Cosa (chi) è 486 DX2 - definizione

32-BIT MICROPROCESSOR MODEL RELEASED IN 1992
486 DX2; 486DX2; 80486DX2; Intel i486DX2; Intel 80486DX2; I486DX2
  • i486DX2 CPU core

486         
  • Frankish]] expansion
YEAR
486 AD; 486 (year); Year 486; AD 486; 486 CE; Events in 486; Births in 486; Deaths in 486
80486         
FAMILY OF 32-BIT MICROPROCESSORS INTRODUCED IN 1989, INCLUDING DX, SX AND SL MODELS
Intel 80486DX; 80486; Intel 486; Intel I486; 486 DX; 486DX; 80486DX; 80486SX; 486 processor; 486dx; Intel i486; Intel 80486 (microarchitecture); Intel i486 (Processor); 486 (PC); 486 (Intel); 486 (computing); 486 (computer); 80-486; SL-enhanced 486; I80486; 486 (CPU); Intel 80486; I486DX
Intel 486         
FAMILY OF 32-BIT MICROPROCESSORS INTRODUCED IN 1989, INCLUDING DX, SX AND SL MODELS
Intel 80486DX; 80486; Intel 486; Intel I486; 486 DX; 486DX; 80486DX; 80486SX; 486 processor; 486dx; Intel i486; Intel 80486 (microarchitecture); Intel i486 (Processor); 486 (PC); 486 (Intel); 486 (computing); 486 (computer); 80-486; SL-enhanced 486; I80486; 486 (CPU); Intel 80486; I486DX
<processor> (Or "i486", "iAPX 80486", and "Intel DX4" but usually just "486"). A range of Intel CISC microprocessors which is part of the Intel 80x86 family of processors. The 486s are very similar to their immediate predecessor, the Intel 80386DX. The main differences are that the 486 has an optimised instruction set, has an on-chip unified instruction and data cache, an optional on-chip floating-point unit (FPU), and an enhanced {bus interface unit}. These improvements yield a rough doubling in performance over an Intel 80386 at the same clock rate. There are several suffixes and variants including: Intel 486SX - a 486DX with its FPU disabled (see crippleware). Intel 486DX - 486SX with a working FPU. 486DX-2 - runs at twice the external clock rate. 486SX-2 - runs at twice the external clock rate. 486SL - 486DX with power conservation circuitry. 486SL-NM - 486SX with power conservation circuitry; SL enhanced suffix, denotes a 486 with special power conservation circuitry similar to that in the 486SL processors. 487 - 486DX with a slightly different pinout for use in 486SX systems. OverDrive - 486DX-2 with a slightly different pinout for use in 486SX systems. RapidCAD - 486DX in a special package with a companion FPU dummy package for use in Intel 80386 systems. Intel DX4, Cyrix Cy486SLC. External clock rates include 16MHz, 20MHz, 25MHz, 33MHz, 40MHz, although 16Mhz is rare now, and the 20MHz processors are often clock doubled. The 486 processor has been licensed or reverse engineered by other companies such as IBM, AMD, Cyrix, and {Chips & Technologies}. Some are almost exact duplicates in specications and performance, some aren't. The successor to the 486 is the Pentium. (1995-02-21)

Wikipedia

Intel DX2

The Intel i486DX2, rumored as 80486DX2 (later renamed IntelDX2) is a CPU produced by Intel that was first introduced in 1992. The i486DX2 was nearly identical to the i486DX, but it had additional clock multiplier circuitry. It was the first chip to use clock doubling, whereby the processor runs two internal logic clock cycles per external bus cycle. An i486 DX2 was thus significantly faster than an i486 DX at the same bus speed thanks to the 8K on-chip cache shadowing the slower clocked external bus.

The i486DX2-66 was a very popular processor for video games enthusiasts in the early to mid-90s. Often coupled with 4 to 8 MB of RAM and a VLB video card, this CPU was capable of playing virtually every game title available for years after its release, right up to the end of the MS-DOS game era, making it a "sweet spot" in terms of CPU performance and longevity. The introduction of 3D graphics spelled the end of the 486's reign, because of their heavy use of floating point calculations and the need for faster cache and more memory bandwidth. Developers began to target the P5 Pentium processor family almost exclusively with x86 assembly language optimizations which led to the usage of terms such as Pentium compatible processor for software requirements. An i486DX2-50 version was also available, but because the bus speed was 25 MHz rather than 33 MHz, this was a significantly less popular processor.

There are two major versions of the DX2 - Identified by P24 and P24D, the latter has a faster L1 cache mode, called "write-back", that improves performance. The original P24 version offered only the slower "write-through" cache mode. AMD and Cyrix both produced a competitor for the Intel i486DX2.