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Cyrix 486

Cyrix Cx486DLC-33GP black

Cyrix Cx486DLC-33GP

Cyrix Cx486DLC-33GP OEM

Cyrix Cx486DLC-33GP OEM

Cyrix Cx486DLC-40GP

Cyrix Cx486SLC/e-V25MP

Cyrix Cx486SLC/e-33MP

Cyrix Cx486DRx²25/50GP

Cyrix Cx486DRx²33/66GP

Cx486 DX Single Clock Version:

Cyrix Cx486DX-33GP

Cyrix Cx486DX-V33QP

Cyrix Cx486DX-40GP

Cyrix Cx486DX-40 w/ Cooler, old Logo

Cyrix Cx486DX-40 w/ Cooler, newer Logo

Cyrix Cx486DX-40 w/ Cooler, new Logo

Cx486 DX Clock Doubled Version:

Cyrix Cx486DX2-50GP

Cyrix Cx486DX2-50 w/ Cooler

Cyrix Cx486DX2-50 w/ Cooler, 'Write-Back'

Cyrix Cx486DX2-66GP

Cyrix Cx486DX2-66GP ("Cooling Fan Required")

Cyrix Cx486DX2-V66GP

Cyrix Cx486DX2-V66GP 3.45V

Cyrix Cx486DX2-66 w/ Cooler

Cyrix Cx486DX2-V80GP 4.0V

Cyrix Cx486DX2-V80GP 3.45V

Cyrix Cx486DX2-80 w/ Cooler

Cx486 DX Clock Tripled Version:

Cyrix Cx486DX4-100GP

Cyrix Cx486DX4-100GP4

Cyrix Cx486S-33GP

Cyrix Cx486S-40 w/ Cooler

Cyrix Cx486S-40GP

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The Cyrix 486DLC Processor

The Cyrix 486DLC is pin compatible to the Intel i386DX. While the internals of the 486DLC are roughly equivalent to those in the i486SX, the bus interface is identical to that of the Intel 386DX, respectively to allow easy replacement of the Intel CPUs by the Cyrix chips. The overall execution speed is about same as with an i486SX, but if you add a matching Cyrix FPU, e.g. a Cyrix 83D87, the speed is about 50% faster than an i486DX running at the same frequency.
For more information on the Cyrix 486DLC/SLC processors please refer to Norbert Juffa's excellent DLC/SLC info summary and performance comparison.

Cyrix Cx486DLC-33GP black


Cx486DLC Cx486DLC-33GP (C)(M) 1992 Cyrix USA AD3224N

Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	5 V
Introduced:	06/1992
Manufactured:	week 24/1992
L1 Cache:	1 KB
Package Type:	Ceramic PGA-132

Cyrix Cx486DLC-33GP


Cx486DLC-33GP BB4248A	(c)(M) 1992 Cyrix USA JAPAN

A quite rare Version of this chip, a so called BB Version. An early piece and a little buggy.

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	5 V
Introduced:	06/1992
Manufactured:	week 48/1992
L1 Cache:	1 KB
Package Type:	Ceramic PGA-132

Cyrix Cx486DLC-33GP OEM


Cx486DLC-33GP FOR OEM USE ONLY AB6303E	(C)(M)1992 Cyrix USA JAPAN

A special OEM version of the above chip with golden Cyrix and Cx486DLC logo.

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	5 V
Introduced:	06/1992
Manufactured:	week 03/1993
Made in:	Japan
L1 Cache:	1 KB
Package Type:	Ceramic PGA-132

Cyrix Cx486DLC-33GP OEM


Cx486DLC-33GP FOR OEM USE ONLY BB6320B	(c)(M) 1992 Cyrix USA JAPAN

A special OEM version of the above chip with golden Cyrix logo.

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	5 V
Introduced:	06/1992
Manufactured:	week 20/1993
L1 Cache:	1 KB
Package Type:	Ceramic PGA-132

Cyrix Cx486DLC-40GP


Cx486DLC-40GP FOR OEM USE ONLY AB6249Z	(c)(M) 1992 Cyrix USA JAPAN

Comment by Paul Collins (pi314aussie[at]yahoo.com):

Where is the 486 DLC2 -50 and the 486SLC2 -50? There was a turbo/upgrade card for the IBM PS/2 model 30/286. This IBM was a crap computer in standard guise. With the upgrage card raising the bar to 486 DLC2 -50 (but only running at 20MHz), the computer was still crap. Yes, the 486 DLC2 has the pin-for-pin out of a 386DX, and the brains/smarts of a 486SX2 inside. But with its 286 converted to 486, and its 10-clock doubled to 20-clock, the "real-world" MS-Windows apps. were only 10%-50% faster. Sure our benchmarking apps. agreed with the 8x (800%) boost, but those MS-apps. didn't run even 2x (200%) faster at all. So I say, once a "boat-anchor", always a boat-anchor. I read about the 486SLC2 -50 being a pin-for-pin out of a 386SX, with the brains of a 486SX2 inside, but never saw it implemented in any desktop computer, only the IBM laptops! The last of the last 386SX m/boards that I saw, were running the AMD386SX -40, with motherboard cache (8k). Since the AMD didn't have L1 cache, but the Cyrix/IBM did have L1 cache, why didn't they make no-name desktop m/boards with 25MHz clock for the SLC2 -50 chips???

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Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	5 V
Introduced:	06/1992
Manufactured:	week 49/1992
Made in:	Japan
L1 Cache:	1 KB
Package Type:	Ceramic PGA-132

Cyrix Cx486SLC/e-V25MP


Cx486SLC/e-V25MP DF7339E	(C)(M)1992 Cyrix USA

This CPU has a 486 instruction set and a 386 pinout. SLC/e stands for low power (SMM: System Management Mode) version of a Cx486SLC.

Comment by Paul Hoffman (paulhoffman18[at]gmail.com):

the Cx486SLC/e was packaged in a unique package named `MQUAD` developed and produced by Olin Interconnect Technologies. The package had a black-anodized lid and base that was attached to the leadframe with an adhesive seal. The characteristic sign of the package was the circular pattern in the center of the lid (as in the picture). This was actually a small anodized aluminum disk that was used to seal a vent hole in the package lid (venting was required during the cure of the adhesive seal). The MQUAD package offered superior thermal performance due to its aluminum body - but was relatively short-lived as it was a non-standard package technology.

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Core Frequency:	25 MHz
Board Frequency:	25 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	3.3 V
Introduced:	12/1992
Manufactured:	week 39/1993
L1 Cache:	1 KB
Package Type:	MQUAD QFP-100

Cyrix Cx486SLC/e-33MP


Cx486SLC/e-33MP FF5403C	(c)(m)1992 Cyrix USA

Donated by SOFTWERK. Thanks a lot!

Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Transistors:	600,000
Voltage:	3.3 V
Introduced:	12/1992
Manufactured:	week 40/1993
L1 Cache:	1 KB
Package Type:	MQUAD QFP-100

Cyrix Cx486 DRx Processors

Cyrix DRx² chips are clock-doubled versions of the Cyrix DLC processors and thus the most effective way to upgrade an i386DX based system. With its clock-doubling feature, the upgrade processor effectively doubles a 386 computer's internal processor speed without requiring a new motherboard. It also delivers other performance enhancements such as 1K on-chip cache with Cyrix cache coherency technology, single cycle instruction execution, and a hardware integer multiplier. These features can boost application performance up to 70% and more.

References: Cyrix 386-to-486 Upgrade Processor Overview Cyrix 386-to-486 Upgrade Processor FAQs

Cyrix Cx486DRx²25/50GP


Cx486DRx²25/50GP FL5407C	(C)(M) 1993 Cyrix USA FL5407C

Core Frequency:	50 MHz
Board Frequency:	25 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 07/1994
L1 Cache:	1 KB
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DRx²33/66GP


Cx486DRx²33/66GP F2B6438J	(C)(M) 1993 Cyrix USA Japan F2B6448J

Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 38/1994
Made in:	Japan
L1 Cache:	1 KB
Package Type:	Ceramic PGA-168
Socket:	1/2/3

The Cyrix 486DX Processor

The Cyrix Cx486DX was designed to be completely software-compatible with Intel's i486DX processor. It is not just an Intel clone but a completely new design by Cyrix. Compared to the i486DX the Cx486DX had an improved cache algorithm and therefore was faster in specific applications. The price for a Cx486DX was a little lower than for Intel's 486DX and made the processor a very common i486DX alternative.

References: Cyrix 486DX2/DX4 Processor FAQs Cyrix 486DX2/DX4 Processor Brief

Cx486 DX Single Clock Version

Cyrix Cx486DX-33GP


Cx486 DX 33 Cx486DX-33GP	COPYRIGHT USA 1993 CYRIX B190702 N04022OU

Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 02/1994
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Ceramic PGA-168
Socket:	2/3

Cyrix Cx486DX-V33QP


Cx486 DX V33 Cx486DX-V33QP 003 FJ5415E

A low voltage version of the Cx486DX-33 (3.3V compared to 5V in the standard version). This processor was intended to be used in mobile devices and comes in a surface-mount PQFP version. This item here is soldered on a small adaptor with standard socket 2/3 pinout.

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.3 V
Introduced:	09/1993
Manufactured:	week 15/1994
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Plastic PQFP-208 on PGA-168
Socket:	2/3

Cyrix Cx486DX-40GP


Cx486 DX 40 Cx486DX-40GP	(c)(m)1993 Cyrix USA JAPAN ABE413R

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 13/1994
Made in:	Japan
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Ceramic PGA-168
Socket:	2/3

Cyrix Cx486DX-40 w/ Cooler, old Logo


Cx486 DX 40	COPYRIGHT USA 1993 CYRIX 8190702N07032 FK3407T

Donated by Christian Lederer. Thanks a lot!

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 40/1994
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Ceramic PGA-168 Cooler
Socket:	2/3

Cyrix Cx486DX-40 w/ Cooler, newer Logo


Cx486 DX 40	(C) (M) 1993 Cyrix USA ALB348A

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 48/1993
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Ceramic PGA-168 Cooler
Socket:	2/3

Cyrix Cx486DX-40 w/ Cooler, new Logo


Cx486 DX 40	(C)(M)1993 Cyrix USA JAPAN ABF419E

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 19/1994
Made in:	Japan
L1 Cache:	8 KB
CPU Code:	Cx486 DX M6
Package Type:	Ceramic PGA-168 Cooler
Socket:	2/3

Cx486 DX Clock Doubled Version

Cyrix Cx486DX2-50GP


Cx468DX2-50GP	COPYRIGHT USA 1993 CYRIX 03H5127N14029 FK5414Z

Core Frequency:	50 MHz
Board Frequency:	25 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	1993
Manufactured:	week 14/1994
Made in:	USA
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-50 w/ Cooler


Cx468DX2-50	COPYRIGHT USA 1993 CYRIX 03H5127N14309 FK5414Z

Core Frequency:	50 MHz
Board Frequency:	25 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	1993
Manufactured:	week 14/1994
Made in:	USA
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-50 w/ Cooler, 'Write-Back'


Cx468DX2-50 CYRIX WRITE BACK Win Logo	COPYRIGHT USA 1993 CYRIX 03H8341 N35091 F2KM435FF

Core Frequency:	50 MHz
Board Frequency:	25 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	1993
Manufactured:	week 35/1994
Made in:	USA
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-66GP


Cx468 DX2 66 Cx486DX2-66GP	(C)(M) 1993 Cyrix USA K2LR535AF

Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-66GP ("Cooling Fan Required")


Cx468 DX2 66 Cx486DX2-66GP Cooling Fan Required	COPYRIGHT USA 1993 CYRIX 03H6366 N29037 PK9429D

Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 29/1994
Made in:	Japan
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-V66GP


Cx468 DX2 V66 Cx486DX2-V66GP 017	(c) (M) 1993 Cyrix USA JAPAN G1BN448K

A low voltage version of the Cx486DX2-66 (3.3V compared to 5V in the standard version).

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Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.3 V
Introduced:	09/1993
Manufactured:	week 48/1994
Made in:	Japan
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-V66GP 3.45V


Cx468 DX2 V66 Cx486DX2-V66GP 3.45V/3.6V/4.0V

Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.45 V
Introduced:	09/1993
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-66 w/ Cooler


Cx486 DX2 66	(c) (M) 1993 Cyrix USA H1LP519B

Core Frequency:	66 MHz
Board Frequency:	33 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168 Cooler
Socket:	1/2/3

Cyrix Cx486DX2-V80GP 4.0V


Cx468 DX2 V80 Cx486DX2-V80GP 4.0V	COPYRIGHT USA 1993 CYRIX

Core Frequency:	80 MHz
Board Frequency:	40 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	4 V
Introduced:	09/1993
Manufactured:	week 48/1994
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-V80GP 3.45V


Cx468 DX2 V80 Cx486DX2-V80GP 017-3.45V	(C)(M) 1993 Cyrix USA USA G3CQ517A

Donated by Jorge Segovia. Thanks a lot!

Core Frequency:	80 MHz
Board Frequency:	40 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.45 V
Introduced:	09/1993
Manufactured:	week 17/1995
Made in:	USA
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX2-80 w/ Cooler


Cx486 DX2 80	(c) (M) 1993 Cyrix USA A8LP514E

Core Frequency:	80 MHz
Board Frequency:	40 MHz
Clock Multiplier:	2.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	09/1993
Manufactured:	week 14/1995
L1 Cache:	8 KB
CPU Code:	Cx468 DX2 M7
Package Type:	Ceramic PGA-168 Cooler
Socket:	1/2/3

Cx486 DX Clock Tripled Version

Cyrix Cx486DX4-100GP


DX4 100 Cx486DX4-100GP 3.45V COOLING FAN REQUIRED	(c) (M) 1993 Cyrix USA G3LU528H

Core Frequency:	100 MHz
Board Frequency:	33 MHz
Clock Multiplier:	3.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.45 V
Introduced:	09/1995
Manufactured:	week 28/1995
L1 Cache:	8 KB
CPU Code:	Cx468 DX4 M9
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486DX4-100GP4


DX4 100 Cx486DX4-100GP4 DX4-P/O 3.54V	(c) (M) 1993 Cyrix USA G3FU529J

Core Frequency:	100 MHz
Board Frequency:	33 MHz
Clock Multiplier:	3.0
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	3.54 V
Introduced:	09/1995
Manufactured:	week 29/1995
L1 Cache:	8 KB
CPU Code:	Cx468 DX4 M9
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486S-33GP


Cx486 S 33 FASCACHE Cx486S-33GP	(c)(m)1993 Cyrix USA JAPAN DB2342J

Donated by Christian Lederer. Thanks a lot!

Comment by VMUNIX (andres_leitner[at]yahoo.com.ar):

I'm wondering what "fastcache" stands for ? and why is it only 2Kb instead of 8Kb

The Cyrix 486S is a i486SX compatible processor with 2kB write back cache. All the other cpus on the market at this time had no write back cache. The 486S also had a special signal (write burst), the usage of this depends on the motherboard design. These both things brought cyrix a speed up of around 6% (to a i486SX).

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Core Frequency:	33 MHz
Board Frequency:	33 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	05/1993
Manufactured:	week 42/1993
Made in:	Japan
L1 Cache:	2 KB
CPU Code:	Cx486 S M5
Package Type:	Ceramic PGA-168
Socket:	1/2/3

Cyrix Cx486S-40 w/ Cooler


Cx486 S 40 FASCACHE	(c)(m)1993 Cyrix USA JAPAN AB1318B

Donated by Christian Lederer. Thanks a lot!

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	05/1993
Manufactured:	week 18/1993
Made in:	Japan
L1 Cache:	2 KB
CPU Code:	Cx486 S M5
Package Type:	Ceramic PGA-168 Cooler
Socket:	2/3

Cyrix Cx486S-40GP


Cx486 S 40 FASCACHE Cx486S-40GP	(c)(m)1993 Cyrix USA JAPAN DB2343K

Core Frequency:	40 MHz
Board Frequency:	40 MHz
Data bus (ext.):	32 Bit
Address bus:	32 Bit
Voltage:	5 V
Introduced:	05/1993
Manufactured:	week 45/1993
Made in:	Japan
L1 Cache:	2 KB
CPU Code:	Cx486 S M5
Package Type:	Ceramic PGA-168
Socket:	2/3

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