Intel 80486 identification

80486 and 80487 identification

You can use processor's part number or a specification number to identify Intel 80486 CPU. Both plastic and ceramic 80486 processors have similar markings. The first picture at the right represents markings for older 80486 CPUs.

Part number provides the most important information about the processor like speed, package type, and integrated features. Please see the table below to find out how to decode the part number.

Specification number usually provides more information about 486 CPUs. To identify Intel 486 processor type in the specification number below and click on the "Search" button.

From an FPO number you can determine when the processor was manufactured. The FPO number consist of 8 characters:

First character (a letter) is a country code where the processor was manufactured.
Second character (a digit) is a last digit of the year when the processor was manufactured.
Third and forth characters (digits) are the week number when the CPU was manufactured.
Remaining four characters are a lot code identifier.

For example, manufacture date of the plastic processor on the top picture is 29th week of 1993, and ceramic 486 CPU on the bottom picture was manufactured on 16th week of 1995.

Newer 80486 CPUs (see bottom picture) have additional processor features markings. These features are:

&E - SL enhanced CPU, i.e. the processor includes power management features.
W - write-back cache.
3V or 3VOLT - the CPU requires 3.3V voltage.
5V - the CPU requires 5V voltage.
1x - the CPU requires 1x external clock (desktop processor).
2x - the CPU requires 2x external clock (mobile processor).

Intel 80486 (old markings) identification picture

Intel 80486 (new markings) identification picture

Related links: 80486 | 80487

¹	²	³	⁴	⁵
A	80486	DX	4	-100

					5. Frequency
					-16	16 MHz
					-20	20 MHz
					-25	25 MHz
					-33	33 MHz
					-50	50 MHz
					-66	66 MHz
					-75	75 MHz
					-100	100 MHz

					4. Clock multiplier
					Blank	Processor runs at the bus frequency
					2	Processor runs at 2x the bus frequency
					4	Processor runs at 3x the bus frequency

					3. Processor features
					SX	Version without co-processor
					DX	Version with integrated co-processor
					SL	Mobile version without co-processor

					2. Part number
					80486	80486 microprocessor
					80487	Co-processor for 80486SX family of processors

					1. Package type
					A	Ceramic PGA
					FC	Shrink QFP
					KU	Plastic QFP

80486 overdrive identification

To identify Intel 80486 overdrive processor you can use either a part number, or a specification number (see picture).

Part number provides the most important information about the processor like speed, installation type and what processor it can replace. Early overdrive processors had part numbers starting from "ODP", for identification of those overdrive processors please see 80486 overdrive (old naming convention) identification section below. Newer overdrive processors have part numbers starting from "DX" or "SX", to identify these processors please see the table below.

Another way to identify 486 overdrive processor is to use a specification number. Currently, this method provides very basic information about the CPU. To identify your overdrive processor type in the specification number below and click on the "Search" button.

Intel 80486 upgrade identification picture

An FPO number is useful if you want to determine when your processor was manufactured. This number consist of 8 characters:

First character (a letter) is a country code where the processor was manufactured.
Second character (a digit) is a last digit of the year when the processor was manufactured.
Third and forth characters (digits) are the week number when the CPU was manufactured.
Remaining four characters are a lot code identifier.

For example, manufacture date of the processor on the picture is 29th week of 1994.

Related links: 80486 overdrive

¹	²	³	⁴	⁵
DX	4	ODP	R	75

					5. Frequency
					50	Upgrades 25 MHz processors to 50 MHz. This part can also upgrade 20 MHz processors to 40 MHz or 16 MHz processors to 32 MHz.
					66	Upgrades 33 MHz processors to 66 MHz.
					75	Upgrades 25 MHz processors to 75 MHz. This part can also upgrade 20 MHz processors to 60 MHz or 16 MHz processors to 48 MHz.
					100	Upgrades 33 MHz processors to 100 MHz.

					4. Installation type
					Blank	Overdrive processor should be installed into upgrade socket.
					R	Overdrive processor replaces original processor ("R" - replacement).

					3. Abbreviation for "OverDrive Processor"

					2. Clock multiplier
					Blank	Overdrive processor runs at the bus frequency
					2	Overdrive processor runs at 2x the bus frequency
					4	Overdrive processor runs at 3x the bus frequency

					1. Original processor type
					DX	Overdrive for 80486DX and 80486SX processors
					SX	Overdrive for 80486SX processors

80486 overdrive (old naming convention) identification

For identification of Intel 80486 overdrive processor you can use either a part number, or a specification number (see picture).

Part number provides the most important information about the processor like speed, installation type and what processor it can replace. Early overdrive processors had part numbers starting from "ODP", to identify these processors please see the table below. Newer overdrive processors have part numbers starting from "DX" or "SX", for identification of those overdrive processors please see 80486 overdrive identification section above.

Specification number provides information similar to the part number. To identify your overdrive processor type in the specification number below and click on the "Search" button.

Intel 80486 upgrade (old markings) identification picture

An FPO number is useful if you want to determine when your processor was manufactured. This number consist of 8 characters:

First character (a letter) is a country code where the processor was manufactured.
Second character (a digit) is a last digit of the year when the processor was manufactured.
Third and forth characters (digits) are the week number when the CPU was manufactured.
Remaining four characters are a lot code identifier.

For example, manufacture date of the processor on the picture is the second week of 1993.

Intel 80486 identification

Search CPU-World

Identify part

Quick Links

Jump to CPU / Family