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Intel i486 SX
  Intel A80486SX-20
  Intel A80486SX-25
  Intel A80486SX-25, Ceramic Lid
  Intel KU80486SX-25
  Intel A80486SX-33
  Intel SB80486SX-33
  Intel A80486SX2-50
  Intel 486SX2-50/SA OEM
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Intel A80486SX-20
Intel A80486SX-20 Top Side
A80486SX-20
L1173927
SX406
INTEL (M) (c) 1989
Intel A80486SX-20 Back Side
91043031CD
USA
EE 15
Donated by SOFTWERK. Thanks a lot!  
Comment by Wingzero (wingzeroismine[at]yahoo.com):
The 486SX processors were the same as their DX counterparts in design, but the built in math co processor was disabled. There was a 487 which was actually a 486 with the math co processor enabled. If the motherboard had this slot for the 487, the SX cpu would be disabled and the 487 cpu would take over all processing.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Was the i486SX "Cripple-chip" really a planned release, or was it actually as rumoured to be, a genuine i486DX -33, that failed the FPU production-line tests???? I was donated an i486SX-20, and I was also donated a "full-size-AT form-factor" 486-33 m/board. This crazy-large m/board had an 80486 socket, and 4167 socket too. It also had sixteen (count them, 16) SIMM sockets, cause, what was a 16MByte SIMM??? It only understood 256kByte and 1MByte SIMMs, and it only understood the 9-chip SIMMs, not the later 3-chip SIMMs. This proved to be a bane to me, as the 9-chip SIMMs cost more than the newer/faster 3-chip units.
I put two-and-two together, and that little PGA SX-20 chip ran at 33MHz just fine. As a test, I tried to smoke-it-out by covering it with cardboard etc. to fry the thing. It would not stop running normally! (Without the cardboard), I ran it at 33MHz for years, before I sold that sytem. Last I heard, it still was fine.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:April 1991
Manufactured:week 17/1991
Made in:USA
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX406
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486SX-25
Intel A80486SX-25 Top Side
A80486SX-25
L3152089
SX679
INTEL (M) (c) 1989
Intel A80486SX-25 Back Side
93086693AA
MALAY
BP 315
Donated by SOFTWERK. Thanks a lot!  
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 15/1993
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX679
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486SX-25, Ceramic Lid
Intel A80486SX-25, Ceramic Lid Top Side
A80486SX-25
L5011191
&E5V1X SX903
INTEL (M) (c) '89'92
Intel A80486SX-25, Ceramic Lid Back Side
8434124GAA
MALAY
FP 501
INTEL (M) (C) 89 92
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 01/1995
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX903
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel KU80486SX-25
Intel KU80486SX-25 Top Side
KU80486SX-25
C3210347
SB5V2X SX763
INTEL(m)(c)'89'92
Intel KU80486SX-25 Back Side
Donated by Christian Lederer. Thanks a lot!  
This is an SMD package CPU mounted on a PGA board to fit into a standard desktop socket.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Great little sub-unit this! Overclocked it to 40MHz no probs. Used it for years and years. No heatsink needed at 40 either! Not bad for a so-called -25.
 
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 21/1993
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX763
Package Type:Plastic
PQFP-196 on PGA-168
Socket: 1/2/3
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Intel A80486SX-33
Intel A80486SX-33 Top Side
A80486SX-33
L4190737
&E5V1X SX797
INTEL (M) (C)'89'92
Intel A80486SX-33 Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 19/1994
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX797
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel SB80486SX-33
Intel SB80486SX-33 Top Side
SB80486SX-33
L4282009
&E3V1X SX855
INTEL (M) (C)'89'92
Intel SB80486SX-33 Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:3.3 V
Introduced:04/1991
Manufactured:week 28/1994
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX855
Package Type:Plastic
PQFP-208
Socket: 1/2/3
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Intel A80486SX2-50
Intel A80486SX2-50 Top Side
A80486SX2-50
L5032202
&E5V1X SX845
INTEL(M)(C)'89'92
Intel A80486SX2-50 Back Side
8425471GAA
MALAY
FH 504
INTEL (M)(C) 89 92
add comment
Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:900,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 03/1995
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX845
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel 486SX2-50/SA OEM
Intel 486SX2-50/SA OEM Top Side
Intel 486SX2-50/SA OEM Back Side
INTEL(m)(c)'89'92
Comment by Paul Collins (pi314aussie[at]yahoo.com):
I lusted for one of these! Time marches on, and I upgraded to Intel DX4 -100 after all. Never got to see one of these SX2's.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:900,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX845
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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