Intel DX4

Intel DX4 100MHz

Voltage converter for DX4 processors (5V to 3,3V)

An IntelDX4 FC80486DX4-75 SX883 75MHz (3 x 25MHz) 16kB Cache L1 WT. It was made in January 1995, and was removed from a Toshiba laptop.

The IntelDX4 is a clock-tripled i486 microprocessor with 16 kB L1 cache. 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 (usually 3× 33.3 MHz, but sometimes also 2× 50 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 3.3V 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.

S-Specs

Processor Speed (MHz)	Input Clock (MHz)	Voltage Center (V)	Voltage Range (V)	Part Number	Clock Multiplier	S-Spec Number
75	25 X 3	3.3	3.1 - 3.6	FC80486DX4-75	3X mode only	SK052, SX883
100	33 X 3	3.3, 3.45	3.1 - 3.6	FC80486DX4-100	3X mode only	SX906
100	33 X 3 / 50 X 2	3.45	3.3 - 3.6	FC80486DX4-100	3X or 2X mode	SX876
100	33 X 3 / 50 X 2	3.3, 3.45	3.1 - 3.6	FC80486DX4-100	3X or 2X mode	SK053
75	25 X 3	3.3	3.1 - 3.6	A80486DX4-75	3X mode only	SK047, SX884
100	33 X 3	3.45	3.3 - 3.6	A80486DX4-100	3X mode only	SK051, SX900
100	33 X 3 / 50 X 2	3.45	3.3 - 3.6	A80486DX4-100	3X or 2X mode	SX877
100	33 X 3 / 50 X 2	3.3	3.1 - 3.6	A80486DX4-100	3X or 2X mode	SK050
100	33 X 3	3.45	3.3 - 3.6	A80486DX4WB-100	3X mode only	SK096
100	33 X 3 / 50 X 2	3.3	3.1 - 3.6	A80486DX4WB-100	3X or 2X mode	Limited availability
75	25 X 3	3.3	3.1 - 3.5	A80486DX4WB-75	3X mode only	SK102
100	33 X 3 / 50 X 2	3.3	3.1 - 3.6	FC80486DX4WB-100	3X or 2X mode	SK099
75	25 X 3	3.3	3.1 - 3.5	FC80486DX4WB-75	3X mode only	SK100

References

External links

http://www.olympusmicro.com/micd/galleries/chips/pages/intel486dx4a.html — photomicrograph of a DX4 microprocessor

Intel processors

Discontinued

BCD oriented (4-bit)	4004 (1971) 4040 (1974)

pre-x86 (8-bit)	8008 (1972) 8080 (1974) 8085 (1977)

Early x86 (16-bit)	8086 (1978) 8088 (1979) 80186 (1982) 80188 (1982) 80286 (1982)

x87 (external FPUs)	8/16-bit databus 8087 (1980) 16-bit databus 80187 80287 80387SX 32-bit databus 80387DX 80487

IA-32 (32-bit)	80386 SX 376 EX 80486 SX DX2 DX4 SL RapidCAD OverDrive A100/A110 Celeron (1998) M D (2004) Pentium Original OverDrive Pro II II OverDrive III 4 M Dual-Core Core Solo Duo

x86-64 (64-bit)	Celeron D Dual-Core Pentium 4 D Extreme Edition Dual-Core Core 2 i7 (some)

Other	CISC iAPX 432 RISC i860 i960 StrongARM XScale

Current

IA-32 (32-bit)	EP80579 Atom CE SoC Quark

x86-64 (64-bit)	Atom CE SoC Celeron Pentium Core i3 i5 i7 m3 m5 m7 Xeon E7 E5 E3 Phi

EPIC	Itanium

Lists

Atom Celeron Core 2 i3 i5 i7 M Itanium Pentium Pro II III 4 D M Dual-Core Xeon

Related

Chipsets PCHs SCHs ICHs PIIXs GPUs Codenames GMA HD and Iris Graphics

Microarchitectures

P5	800 nm P5 600 nm P54C 350 nm P54CS P55C 250 nm Tillamook

P6 / Pentium M / Enhanced Pentium M	500 nm P6 350 nm P6 Klamath 250 nm Mendocino Dixon Tonga Covington Deschutes Katmai Drake Tanner 180 nm Coppermine Coppermine T Timna Cascades 130 nm Tualatin Banias 90 nm Dothan Stealey Tolapai Canmore 65 nm Yonah Sossaman

NetBurst	180 nm Willamette Foster 130 nm Northwood Gallatin Prestonia 90 nm Tejas and Jayhawk Prescott Smithfield Nocona Irwindale Cranford Potomac Paxville 65 nm Cedar Mill Presler Dempsey Tulsa

Core / Penryn	65 nm Merom-L Merom Conroe-L Allendale Conroe Kentsfield Woodcrest Clovertown Tigerton 45 nm Penryn Penryn-QC Wolfdale Yorkfield Wolfdale-DP Harpertown Dunnington

Bonnell / Saltwell	45 nm Silverthorne Diamondville Pineview Lincroft Tunnel Creek Stellarton Sodaville Groveland 32 nm Cedarview Penwell Cloverview Berryville Centerton

Nehalem / Westmere	45 nm Clarksfield Lynnfield Jasper Forest Bloomfield Gainestown (Nehalem-EP) Beckton (Nehalem-EX) 32 nm Arrandale Clarkdale Gulftown (Westmere-EP) Westmere-EX

Sandy Bridge / Ivy Bridge	32 nm Sandy Bridge Sandy Bridge-E Gladden 22 nm Ivy Bridge Ivy Bridge-EP Ivy Bridge-EX

Haswell / Broadwell	22 nm Haswell 14 nm Broadwell

Silvermont / Airmont	22 nm Valleyview Tangier Anniedale 14 nm Cherryview

Skylake/Kaby Lake/Cannonlake	14 nm Skylake Kaby Lake 10 nm Cannonlake

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