Intel DX4: Difference between revisions

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{{Short description|4th generation x86 CPU}}

The [[Intel]] '''DX4''' is a clock-tripled [[80486]] [[microprocessor]] chip. Intel named their chip deceptively during [[litigation]] with [[AMD]] over [[trademark]]s. The product was officially named the DX4, but [[OEM]]s continued using the 486DX4 naming convention.

[[File:Intel i486 dx4 100mhz 2007 03 27.jpg|thumb|Intel DX4 100 MHz]]

[[File:Voltage converter for 80486 dx4 processors 2007 03 27.jpg|thumb|Voltage converter for DX4 processors (5 V to 3.3 V)]]

[[File:FC80486DX4-75 AK SX883 USA 1995 01 WT.jpg|thumb|An IntelDX4 FC80486DX4-75 SX883 75 MHz (3× 25 MHz) 16 KB cache L1 WT. This unit was made in January 1995, and was taken from a Toshiba laptop.]]

[[File:KL Intel Overdrive DX40DPR100.jpg|thumb|Intel DX4 Overdrive]]

'''IntelDX4''' is a [[CPU multiplier|clock-tripled]] [[i486]] [[microprocessor]] with 16&nbsp;KB level&nbsp;1 cache.<ref>{{Cite web |date=July 1997 |title=Embedded Intel486™ Processor Hardware Reference Manual |url=https://www.pld.ttu.ee/~prj/486dev.pdf |archive-url=http://web.archive.org/web/20240415053114/https://www.pld.ttu.ee/~prj/486dev.pdf |archive-date=15 April 2024 |access-date= |website=www.pld.ttu.ee |publisher=Intel}}</ref> Intel named it DX4 (rather than ''DX3'') as a consequence of [[litigation]] with [[Advanced Micro Devices]] over [[trademark]]s. The product was officially named IntelDX4, but [[original equipment manufacturer|OEM]]s continued using the i486 naming convention.

Intel produced DX4sIntelDX4s with two [[clock speed]] steppings: A 75 -[[megahertz|MHz]] version (3x3× 25 &nbsp;MHz multiplier), and a 100 -MHz version (usually 3x3× 33.3&nbsp;MHz or 2x 50&nbsp;MHz,). butBoth sometimeschips 2were released in March 1994.5x 40A MHzversion orof 2xIntelDX4 50featuring MHz)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.” [[Intel 80486486 OverDrive|i486 OverDrive]] editions of the DX4IntelDX4 had locked multipliers, and therefore can run only run at 3x3× the external clock- speed. The 100-MHz model of the processor had an [[iCOMP (index)|iCOMP]] rating of 435, while the 75-MHz processor had a rating of 319. IntelDX4 was an OEM-only product, but the DX4 Overdrive could be purchased at a retail store.

The IntelDX4 microprocessor is mostly [[pin-compatibility|pin-compatible]] with the [[i486]], but requires a lower 3.3-V supply. Normal i486DX and DX2 processors use a 5-V supply; plugging a DX4 into an unmodified socket will destroy the processor. Motherboards lacking support for the 3.3-V CPUs can sometimes make use of them using a [[voltage regulator module]] (VRM) that fits between the socket and the CPU. The i486 DX4 OverDrive CPUs have voltage regulator modules built in.

*cough* look out for evil edit0rs *cough*

==Specifications==

{| class="wikitable"

! Processor speed (MHz) || Input clock (MHz) and multiplier || Voltage (nominal) (V) || Voltage range (V) || Part number || Sspec number

|-

|75 || 25 × 3 || 3.3 || 3.1–3.6 || FC80486DX4-75 || SK052, SX883

|-

|75 || 25 × 3 || 3.3 || 3.1–3.6 || A80486DX4-75 || SK047, SX884

|-

|75 || 25 × 3 || 3.3 || 3.1–3.5 || A80486DX4WB-75 || SK102

|-

|75 || 25 × 3 || 3.3 || 3.1–3.5 || FC80486DX4WB-75 || SK100

|-

|100 || 33 × 3 || 3.3, 3.45 || 3.1–3.6 || FC80486DX4-100 || SX906

|-

|100 || 33 × 3 || 3.45 || 3.3–3.6 || A80486DX4-100 || SK051, SX900

|-

|100 || 33 × 3 || 3.45 || 3.3–3.6 || A80486DX4WB-100 || SK096

|-

|100 || 33 × 3, 50 × 2 || 3.45 || 3.3–3.6 || FC80486DX4-100 || SX876

|-

|100 || 33 × 3, 50 × 2 || 3.3, 3.45 || 3.1–3.6 || FC80486DX4-100 || SK053

|-

|100 || 33 × 3, 50 × 2 || 3.45 || 3.3–3.6 || A80486DX4-100 || SX877

|-

|100 || 33 × 3, 50 × 2 || 3.3 || 3.1–3.6 || A80486DX4-100 || SK050

|-

|100 || 33 × 3, 50 × 2 || 3.3 || 3.1–3.6 || A80486DX4WB-100 || Limited availability

|-

|100 || 33 × 3, 50 × 2 || 3.3 || 3.1–3.6 || FC80486DX4WB-100 || SK099

|}

==References==

{{reflist}}

{{Intel processors|discontinued}}

[[Category:Intel x86 microprocessors|80486DX4]]<!--For the sake of sorting within category-->

[[Category:32-bit microprocessors]]

[[Category:Computer-related introductions in 1994]]

[[de:Intel i486#Intel DX4]]