Intel 80486DX4
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The Intel i486DX4 is a clock-tripled i486 microprocessor. Intel named it deceptively during litigation with AMD over trademarks. The product was officially named the DX4, but OEMs continued using the i486 naming convention.
Intel produced i486DX4s with two clock speed steppings: A 75 MHz version (3× 25 MHz multiplier) in 1994, and a 100 MHz version (usually 3× 33.3 MHz, but sometimes 2.5× 40 MHz or 2× 50 MHz) with an improved write-back CPU cache in 1996. i486 OverDrive editions of the i486DX4 had locked multipliers, and therefore can run only at 3x the external clock-speed.
The 100 MHz model of the processor had an iCOMP rating of 435, whilst the 75 MHz processor had a rating of 319. The i486's improvements over the i386 mean that the entire 486 range has nearly double the performance of i386 with the same clock rate.
The DX4 microprocessor was mostly pin-compatible with the 80486, but required a lower 3.3V supply. Normal 80486 and DX2 processors used a 5V supply; plugging a DX4 into an unmodified socket would destroy it.
[edit] References
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[edit] External Links
- http://www.olympusmicro.com/micd/galleries/chips/intel486dx4a.html — photomicrograph of a DX4 microprocessor
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