Editing Intel DX4

{{Short description|4th generation x86 CPU}}
[[File:Intel i486 dx4 100mhz 2007 03 27.jpg|thumb|Intel DX4 100&nbsp;MHz]]
[[File:Voltage converter for 80486 dx4 processors 2007 03 27.jpg|thumb|Voltage converter for DX4 processors (5&nbsp;V to 3.3&nbsp;V)]]
[[File:FC80486DX4-75 AK SX883 USA 1995 01 WT.jpg|thumb|An IntelDX4 FC80486DX4-75 SX883 75&nbsp;MHz (3× 25&nbsp;MHz) 16&nbsp;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>http://www.pld.ttu.ee/~prj/486dev.pdf {{Bare URL PDF|date=March 2022}}</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 IntelDX4s with two [[clock speed]] steppings: A 75-[[megahertz|MHz]] version (3× 25&nbsp;MHz multiplier), and a 100-MHz version (3× 33.3&nbsp;MHz or 2x 50&nbsp;MHz). Both chips were released in March 1994. A version of 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.” [[Intel 486 OverDrive|i486 OverDrive]] editions of 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 (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.

==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]]