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Intel 80486DX4

 
Intel 80486DX4

 
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Intel 80486DX4
 
 
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The Intel IntelDX4 is a clock-tripled i486 microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
 with 16kb L1 cache. Intel named it deceptively during litigation with AMD over trademark
TradeMark

TradeMark is a tall, primarily residential, skyscraper in Charlotte, North Carolina. It was completed in 2007 and has 28 floors. There are 200 hundred residential units....
s. The product was officially named the IntelDX4, but OEM
Original Equipment Manufacturer

OEM stands for "Original Equipment Manufacturer".An original equipment manufacturer, or OEM is typically a company that uses a component made by a second company in its own product, or sells the product of the second company under its own brand....
s continued using the i486 naming convention.

Intel produced IntelDX4s with two clock speed steppings: A 75 MHz version (3× 25 MHz multiplier), and a 100 MHz version (usually 3× 33.3 MHz, but sometimes also 2x50MHz).






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The Intel IntelDX4 is a clock-tripled i486 microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
 with 16kb L1 cache. Intel named it deceptively during litigation with AMD over trademark
TradeMark

TradeMark is a tall, primarily residential, skyscraper in Charlotte, North Carolina. It was completed in 2007 and has 28 floors. There are 200 hundred residential units....
s. The product was officially named the IntelDX4, but OEM
Original Equipment Manufacturer

OEM stands for "Original Equipment Manufacturer".An original equipment manufacturer, or OEM is typically a company that uses a component made by a second company in its own product, or sells the product of the second company under its own brand....
s continued using the i486 naming convention.

Intel produced IntelDX4s with two clock speed steppings: A 75 MHz version (3× 25 MHz multiplier), and a 100 MHz version (usually 3× 33.3 MHz, but sometimes also 2x50MHz). Both chips were released on March 1994. A version of the IntelDX4 featuring write-back cache was released in October 1994. The original write-through versions of the chip are marked with a laser embossed "&E", while the write-back enabled versions are marked "&EW". i486 OverDrive
Intel 80486 OverDrive

The Intel's i486 OverDrive processors are a category of various Intel 80486s that were produced with the designated purpose of being used to upgrade personal computers....
 editions of the IntelDX4 had locked multipliers, and therefore can only run at 3x the external clock-speed. The 100 MHz model of the processor had an iCOMP
ICOMP

iCOMP for Intel Comparative Microprocessor Performance was an index published by Intel used to measure the relative performance of its microprocessors....
 rating of 435, whilst the 75 MHz processor had a rating of 319. The IntelDX4 was an OEM-only product, but the DX4 Overdrive could be purchased at a retail store.

The IntelDX4 microprocessor is mostly pin-compatible
Pin-compatibility

In electronics, a pin-compatible device, such as a logic gate , Computer data storage or microprocessor, is one that has the same functions assigned to the same particular pins....
 with the 80486, but requires a lower 3.3V supply. Normal 80486 and DX2 processors use a 5V supply; plugging a DX4 into an unmodified socket will destroy it. Motherboards lacking support for the 3.3V CPUs can sometimes make use of them using a voltage regulator (VRM) that fits between the socket and the CPU.

The 486DX4 is still in production for industrial applications requiring moderate embedded processing capability.

IntelDX3

The IntelDX3 was intended to make use of a 2.5X multiplier (used by the Socket3 Pentium Overdrive), using the same die as the IntelDX4. For unknown reasons the IntelDX3 was never released. In the official white papers for the IntelDX4 there are instructions for enabling the 2.5X multiplier, however the feature was not implemented in the production version.

External links

  • — photomicrograph of a DX4 microprocessor