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Intel i386 SX
  Intel NG80386SX-16, no logo
  Intel NG80386SX-16 C STEP
  Intel NG80386SX-16
  Intel NG80386SX-20 C STEP
  Intel NG80386SX-20
  Intel NG80386SX-25
  Intel NG80386SX33
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The Intel i386 SX Processor
Late in the 80386's production run, Intel introduced the 80386SX, which was meant to be a low cost version of the i386. The SX series of chips was 32-bit internally, but had a 16-bit external bus (in much the same way that the 8088 in the original IBM PC was a lower cost version of the 8086). The original 80386 was subsequently renamed the 80386DX to avoid confusion. Neither CPU included a math coprocessor (most motherboards included a socket for an 80387), though the naming would cause some head-scratching later when the 486 came in a DX variant that did include floating-point capability (while the 486SX did not).
 
References:  i386 Manuals and Datasheets  Wikipedia  Intel
Intel NG80386SX-16, no logo
Intel NG80386SX-16, no logo Top Side
NG80386SX-16
I8422004
(m)(c) '85 '87
Intel NG80386SX-16, no logo Back Side
38281500
CA 840
129
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 42/1988
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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Intel NG80386SX-16 C STEP
Intel NG80386SX-16 C STEP Top Side
NG80386SX-16
C STEP
L0242425
(m) (c) '85 '87
Intel NG80386SX-16 C STEP Back Side
5002060G
CE 022
EE
Donated by Sven Brotkorb. Thanks a lot!  
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Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 24/1990
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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Intel NG80386SX-16
Intel NG80386SX-16 Top Side
NG80386SX-16
L9430274
(M)(C) '85 '87
Intel NG80386SX-16 Back Side
8932221M
CB 939
E
Donated by Jorge Segovia. Thanks a lot!  
add comment
Core Frequency:16 MHz
Board Frequency:16 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:June 16, 1988
Manufactured:week 40/1990
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
top of page
Intel NG80386SX-20 C STEP
Intel NG80386SX-20 C STEP Top Side
NG80386SX-20
C STEP
L1164186
(m)(c) '85 '87
Intel NG80386SX-20 C STEP Back Side
81036040
CB 114
BA
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:January 25, 1989
Manufactured:week 16/1991
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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Intel NG80386SX-20
Intel NG80386SX-20 Top Side
NG80386SX-20
C 1490217
(m) (c) '85 '87
i386 SX
Intel NG80386SX-20 Back Side
7139534N
CD 145
CG
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:January 25, 1989
Manufactured:week 49/1991
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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Intel NG80386SX-25
Intel NG80386SX-25 Top Side
NG80386SX-25
L2403222
(m) (c) '85 '87
i386 SX
Intel NG80386SX-25 Back Side
8231701W
AF AL38
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 26, 1992
Manufactured:week 40/1992
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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Intel NG80386SX33
Intel NG80386SX33 Top Side
NG80386SX33
L8221204E
(m) (c) '85 '87
i386 SX
Intel NG80386SX33 Back Side
9 04261S
QC CX 29
AF AL38
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):16 Bit
Address bus:24 Bit
Transistors:275,000
Circuit Size:1.50
Voltage:5 V
Introduced:October 26, 1992
Manufactured:week 22/1988
CPU Code:i386 SX
P9
Package Type:Plastic
PQFP-100
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