“Intel DX4”的意思、由来-开放百科全书

词条

Intel DX4

释义

S-specs
References

The IntelDX4 is a clock-tripled i486 microprocessor with 16 KB L1 cache^[1]. Intel named it DX4 (rather than DX3) as a consequence of litigation with AMD over trademarks. The product was officially named the IntelDX4, but OEMs 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 (3× 33.3 MHz). Both chips were released in 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 editions of the IntelDX4 had locked multipliers, and therefore can only run at 3× the external clock-speed. The 100 MHz model of the processor had an iCOMP rating of 435, while 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 with the 80486, but requires a lower 3.3 V supply. Normal 80486 and DX2 processors use a 5 V supply; plugging a DX4 into an unmodified socket will destroy it. Motherboards lacking support for the 3.3 V CPUs can sometimes make use of them using a voltage regulator (VRM) that fits between the socket and the CPU.

S-specs

Processor speed (MHz)	Input clock (MHz)	Voltage center (V)	Voltage range (V)	Part number	Clock multiplier	S-spec number
75	25× 3	3.3	3.1–3.6	FC80486DX4-75	3× mode only	SK052, SX883
100	33× 3	3.3, 3.45	3.1–3.6	FC80486DX4-100	3× mode only	SX906
100	33× 3 / 50× 2	3.45	3.3–3.6	FC80486DX4-100	3× or 2× mode	SX876
100	33× 3 / 50× 2	3.3, 3.45	3.1–3.6	FC80486DX4-100	3× or 2× mode	SK053
75	25× 3	3.3	3.1–3.6	A80486DX4-75	3× mode only	SK047, SX884
100	33× 3	3.45	3.3–3.6	A80486DX4-100	3× mode only	SK051, SX900
100	33× 3 / 50× 2	3.45	3.3–3.6	A80486DX4-100	3× or 2× mode	SX877
100	33× 3 / 50× 2	3.3	3.1–3.6	A80486DX4-100	3× or 2× mode	SK050
100	33× 3	3.45	3.3–3.6	A80486DX4WB-100	3× mode only	SK096
100	33× 3 / 50× 2	3.3	3.1–3.6	A80486DX4WB-100	3× or 2× mode	Limited availability
75	25× 3	3.3	3.1–3.5	A80486DX4WB-75	3× mode only	SK102
100	33× 3 / 50× 2	3.3	3.1–3.6	FC80486DX4WB-100	3× or 2× mode	SK099
75	25× 3	3.3	3.1–3.5	FC80486DX4WB-75	3× mode only	SK100

References

1. ^http://www.pld.ttu.ee/~prj/486dev.pdf

{{Intel processors|discontinued}}Intel i486#Intel DX4

1 : Intel x86 microprocessors

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