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Archive-name: pc-hardware-faq/chiplist/part5
Last-modified: 1998/06/14
Version: 9.9.5
3 NPX (Numerical Processor eXtension)
3.1 Introduction
3.2 Intel i8087 NPX
NPX for Intel i8086 CPU, Intel i8088 CPU, Intel i80186 CPU, Intel i80188 CPU.
5 MHz (8087-3).
8 MHz (8087-2), HMOS.
10 MHz (8087-1): 2400 mW.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Technology: NMOS.
3.3 Intel i80287 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
1983.
6 MHz.
8 MHz.
10 MHz: 2400 mW.
Intel i80287-fast10: 10 MHz, asynchronous.
Package: 40 pin CERDIP (CERamic Dual In-line Package).
Technology: NMOS.
3.4 AMD Am80287 NPX
3.4.1 AMD Am80C287 NPX
Intel i80287 NPX instruction/pin compatible.
Intel i80287 NPX core/microcode.
1989.
10 MHz.
12 MHz.
16 MHz.
Package: 40 pin CERDIP (CERamic Dual In-line Package),
40 pin plastic DIP (Dual In-line Package),
44 pin PLCC (Plastic Leaded Chip Carrier).
Technology: CMOS.
3.4.2 AMD Am80EC287 NPX
AMD Am80C287 NPX with power management.
Technology: CMOS.
3.5 Cyrix Cx287 NPX
Intel i80287 NPX instruction/pin compatible.
8 MHz.
10 MHz.
12 MHz.
16 MHz.
20 MHz.
3.6 Intel i80187 NPX
NPX for Intel i80C186 CPU.
Intel i80387 NPX core/microcode.
Intel i80387 NPX instruction compatible.
12.5 MHz: 1989, CMOS, 675 mW.
16 MHz: 1989, CMOS, 780 mW.
20 MHz: CMOS.
Package: 40 pin CERDIP (CERamic Dual In-line Package),
44 pin PLCC (Plastic Leaded Chip Carrier).
Dropped in 1991.
3.7 Intel i80287XL NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
Intel i80387 NPX instruction compatible.
Intel i80387 NPX core/microcode.
Intel i80287 NPX pin compatible.
8 MHz.
10 MHz.
12.5 MHz: 1990, 675 mW.
16 MHz.
20 MHz.
Package: 40 pin CERDIP (CERamic Dual In-line Package),
44 pin PLCC (Plastic Leaded Chip Carrier) (Intel i80287XLT NPX).
Technology: CMOS.
3.8 Cyrix FasMath Cx82S87 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
Intel i80387 NPX instruction compatible.
Cyrix FasMath Cx83D87 NPX core/microcode (until November 1991)
Cyrix FasMath Cx387+ NPX core/microcode (from November 1991).
6 MHz: 1991.
8 MHz: 1991.
10 MHz: 1991.
12 MHz: 1991.
16 MHz: 1991.
20 MHz: 1991.
Package: 40 pin DIP (Dual In-line Package) (Intel i80287 NPX pin compatible),
44 pin PLCC (Plastic Leaded Chip Carrier) (Intel i80287XLT NPX pin
compatible).
Static core.
Technology: CMOS.
3.9 IIT IIT-2C87 NPX
NPX for Intel i80286 CPU, Intel i80386 CPU.
IIT IIT-3C87 NPX instruction compatible.
IIT IIT-3C87 NPX core/microcode.
Intel i80287 NPX pin compatible.
8 MHz.
10 MHz.
IIT IIT-2C87-10F NPX: 10 MHz, asynchronous.
12 MHz.
IIT IIT-2C87-12F NPX: 12 Mhz, asynchronous.
16 MHz.
20 MHz, 1989, 500 mW.
IIT IIT-2C87-20F NPX: 20 MHz, asynchronous.
Technology: CMOS.
3.10 Intel i80387 NPX
3.10.1 Intel i80387 NPX
NPX for Intel i80386/i80386DX CPU.
1986.
16 MHz: 750 mW.
20 MHz: 950 mW.
25 MHz: 1250 mW.
33 MHz.
Package: 68 pin, 2 row ceramic PGA (Pin Grid Array).
Technology: 1.5 micron CHMOS III.
3.10.2 Intel i80387DX NPX
NPX for Intel i80386/i80386DX CPU.
Enhanced Intel i80387 NPX.
1989.
16 MHz.
20 MHz: 525 mW.
25 MHz: 625 mW.
33 MHz: 750 mW.
Package: 68 pin, 2 row PGA (Pin Grid Array).
Technology: CHMOS IV.
3.10.3 Intel i80387SX NPX
NPX for Intel i80386SX CPU.
Intel i80387 NPX core/microcode.
16 MHz: 740 mW.
20 MHz: 1000 mW.
25 MHz.
33 MHz.
Package: 68 pin PLCC (Plastic Leaded Chip Carrier).
3.10.4 Intel i80387SL Mobile NPX
NPX for Intel i80386SL CPU.
Intel i80387DX NPX core/microcode.
Extra features: cache controller,
programmable memory controller,
expanded memory support.
Static core.
Power management: SMM (System Management Mode).
1992.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
Technology: CHMOS IV.
3.10.5 Intel i80X87SL Mobile NPX
NPX for Intel i80386SX CPU.
Intel i80387DX NPX core/microcode.
16 MHz.
20 MHz.
25 MHz.
3.11 Chips & Technologies SuperMath 38700 NPX
3.11.1 Chips & Technologies SuperMath 38700DX NPX
Intel i80387DX NPX instruction/pin compatible.
Power Management.
16 MHz: 1991.
20 MHz: 1991.
25 MHz: 1991.
33 MHz: 1991.
40 MHz: 1991.
No longer available.
Technology: 1.2 micron CMOS.
3.11.2 Chips & Technologies SuperMath 38700SX NPX
Intel i80387SX NPX instruction/pin compatible.
Power management.
16 MHz: 1991.
20 MHz: 1991.
25 MHz: 1991.
No longer available.
3.12 Cyrix 80387 NPX
3.12.1 Cyrix FasMath Cx83D87 NPX
Intel i80387DX NPX instruction/pin compatible.
Power management.
Computations are executed faster than by Intel i80387DX NPX.
Later versions (from November 1991) correctly co-operate with first generation
Cyrix Cx486DLC CPUs, which were having synchronization problems, when
co-operating with a NPX.
1989.
16 MHz.
20 MHz.
25 MHz.
33 MHz: 500 mW.
40 MHz: November 1991.
Technology: CMOS.
3.12.2 Cyrix FasMath Cx387+ NPX
European name for Cyrix FasMath Cx83D87 NPX from November 1991.
40 MHz: November 1991.
3.12.3 Cyrix FasMath EMC87 NPX
Also know as Cyrix AutoMath.
Cyrix Cx83D87 NPX with extra features: memory-mapped mode.
20 MHz.
25 MHz.
33 MHz: 2000 mW.
40 MHz.
Package: 121 pin PGA (Pin Grid Array) (121 pin EMC: Extended Math Coprocessor)
Technology: CMOS.
3.12.4 Cyrix FasMath 83S87 NPX
Intel i80387SX NPX instruction/pin compatible.
Cyrix Cx387+ NPX core/microcode after November 1991
Power management.
Computations are executed faster than by Intel i80387SX NPX.
16 MHz.
20 MHz: 350 mW.
25 MHz.
33 MHz.
Technology: CMOS.
3.12.5 Cyrix Cx387DX NPX
Intel i80387DX NPX instruction/pin compatible.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
40 MHz.
Technology: CMOS.
3.12.6 Cyrix Cx387SX NPX
Intel i80387SX NPX instruction/pin compatible.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
Technology: CMOS.
3.12.7 Cyrix Cx387 NPX announcements
Clock doubled NPXs.
3.13 IIT IIT-3C87 NPX
NPX for Intel i80386 CPU.
Not fully Intel i80387 NPX instruction compatible.
Extra features.
3.13.1 IIT IIT-3C87 NPX
NPX for Intel i80386/i80386DX CPU.
1989.
16 MHz.
20 MHz.
25 MHz.
33 MHz.
40 MHz: 600 mW.
Intel i80387DX NPX pin compatible.
Technology: CMOS.
3.13.2 IIT IIT-3C87SX NPX
16 MHz.
20 MHz.
25 MHz.
33 MHz.
40 MHz.
Intel i80387SX NPX pin compatible.
Technology: CMOS.
3.13.3 IIT IIT-XC87DLX2 NPX
Clock doubled version of the IIT IIT-3C87 NPX.
25/50 Mhz: March 1994.
3.14 ULSI Math*Co 83C87 NPX
Intel i80387DX NPX instruction/pin compatible.
1991.
20 MHz: 400 mW.
25 MHz: 500 mW.
33 MHz: 625 mW.
40 MHz: 750 mW.
Technology: CMOS.
3.15 ULSI Math*Co 83S87 NPX
Intel i80387SX NPX instruction/pin compatible.
Power management.
16 MHz: 300 mW.
20 MHz: 350 mW.
25 MHz: 400 mW.
3.16 Weitek Abacus 1167 NPX
NPX for Intel i80386DX CPU.
Not Intel i80387 NPX instruction compatible.
In fact a small PCB with three chips mounted on it.
Not Intel i80387DX NPX pin compatible.
3.17 Weitek Abacus 3167 NPX
NPX for Intel i80386DX CPU, Intel i80486 CPU.
Not Intel i80387 NPX instruction compatible.
Not Intel i80387DX NPX pin compatible.
Package: 121 pin, 3 row PGA (Pin Grid Array) (EMC (Extended Math Coprocessor)
socket).
Can be used together with Intel i80387DX NPX. If the motherboard has no apart
PGA for the Abacus, two NPXs can be used simultaniously by installing an
extra PCB, containing two PGAs, on the original PGA.
20 MHz.
25 MHz: 1750 mW.
33 MHz: 2250 mW.
40 MHz.
3.18 RISE 80387 NPX
Intel i80387DX NPX instruction/pin compatible.
3.19 Symphony Laboratories 80387 NPX
Intel i80387DX NPX instruction/pin compatible.
Sample chips.
3.20 Cyrix Cx4C87DLC NPX
NPX for Cyrix Cx486DLC CPU.
25 MHz.
33 MHz.
40 MHz.
Intel i80387DX NPX pin compatible.
Technology: CMOS.
3.21 IIT IIT-4C87 NPX
3.21.1 IIT IIT-4C87DLC NPX
NPX for 486DLC CPU.
40 MHz.
Intel i80387DX NPX pin compatible.
Technology: CMOS.
3.21.2 IIT IIT-4C87 NPX announcements
Clock doubled versions of IIT-4C87DLC NPX.
3.22 Intel i80487 NPX
NPX for Intel i80486SX CPU.
3.22.1 Intel i80487SX P23N NPX
In fact an Intel i80486DX CPU with different pin layout (in Intel i80487SX NPX
socket) and one extra pin assigned to disable the Intel i80486SX CPU. The
Intel i80486SX CPU can be removed.
20 MHz: 3250 mW.
25 MHz.
Package: 169 pin PGA (Pin Grid Array).
Technology: CMOS.
ID: step level A0: DH = 0x04 (family ID), DL = 0x20 (model ID, revision),
step level B0: DH = 0x04 (family ID), DL = 0x21 (model ID, revision).
3.22.2 Intel i80487 NPX
In fact an Intel i80486DX CPU with Intel i80486SX CPU pin layout (in
Intel i80486SX CPU socket).
25 MHz.
Technology: CMOS.
3.23 Cyrix Cx487S NPX
NPX for Cyrix FasCache Cx486D CPU.
Technology: CMOS.
3.24 Weitek Abacus 4167 NPX
NPX for Intel i80486 CPU.
Not Intel i80387 NPX instruction compatible.
25 MHz: 2500 mW.
33 MHz.
Package: 142 pin, 3 row PGA (Pin Grid Array).
Credits
Marc E. Nijdam,
Norbert Juffa (norbert@nexgen.com):
Performance Comparison Intel 386DX, Intel RapidCAD, C&T 38600DX,
Cyrix 486DLC (USENET News),
Everything You Always Wanted to Know about Math Coprocessors
(USENET News),
George Wang (gcw@interwb.com),
Shark Yeuk-Hai Mok (yhmok@shark.mti.sgi.com),
Wayne Schlitt (backbone!wayne@tower.tssi.com),
Dmitry Stefankov (wizard@npi.msu.su),
Alex V. Potemkin (avp@iron.misa.ac.ru),
Rob Milstrey (rmilstre@pcocd2.intel.com),
Martin Malik, RealSoft,
Aleksandr K. Konosevich (eshslabs@univer.omsk.su).
Compiled, Copyright 1993 - 1998, by A. Offerman. Permission to use, copy, or
distribute this document in a non-commercial way for non-commercial use is
hereby granted, provided that this copyright and permission notice appear in
all copies. All other rights reserved.
This document is provided "as is" without expressed or implied warranty.
The specific products and their respective manufacturers are not to be taken
as endorsements of, nor commercials for, the manufacturer.
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