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Toshiba MIPS Rx000
  Toshiba TC85R4000PC-50
  Toshiba TC85R4000SC-50
  Toshiba TC86R4400MC-200
  Toshiba TC86R10000-195
  Toshiba TC86R10000-200
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The Toshiba / MIPS R4000 Processor
The MIPS R4000 series, released in 1991, extended the MIPS instruction set to a full 64-bit architecture and moved the FPU onto the main die to create a single-chip system. The design was so important to SGI, at the time MIPS' major customer, that SGI bought the company in 1992.
The R4x00 processors have been available and used in different versions. PC (as in R4000PC) denotes primary cache only and SC denotes secondary cache. The MC versions contain special support for cache architectures in multiprocessor systems.
R4000 processors where used in many Silicon Graphics computers, e.g. the Indigo workstations and Crimson servers.
 
References:  MIPS R4000 Microprocessor User's Guide  R4000 at SGIstuff

Note: The last two digits of the part number on older Toshiba R4000 processors is the external clock speed, internal is twice that.
Toshiba TC85R4000PC-50
Toshiba TC85R4000PC-50 Top Side
TC85R4000PC-50
JAPAN
9336YJA-ES
Toshiba TC85R4000PC-50 Back Side
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Core Frequency:100 MHz
Board Frequency:50 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:5 V
Introduced:05/1994
Manufactured:week 36/1993
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-179
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Toshiba TC85R4000SC-50
Toshiba TC85R4000SC-50 Top Side
TC85R4000SC-50
JAPAN
9305YJI-ES
Toshiba TC85R4000SC-50 Back Side
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Core Frequency:100 MHz
Board Frequency:50 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:5 V
Introduced:05/1994
Manufactured:week 05/1993
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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The Toshiba R4400 Processor
The MIPS R4000 series, released in 1991, extended the MIPS instruction set to a full 64-bit architecture and moved the FPU onto the main die to create a single-chip system. The design was so important to SGI, at the time MIPS' major customer, that SGI bought the company in 1992. A number of improved versions soon followed, including the R4400.
The R4x00 processors have been available and used in different versions. PC (as in R4400PC) denotes primary cache only and SC denotes secondary cache. The MC versions contain special support for cache architectures in multiprocessor systems.
R4400 processors where used in many Silicon Graphics computers, e.g. the Indigo2 workstations, Onyx supercomputers and Challenge servers.
 
References:  MIPS R4400 Product Information  R4400 at SGIstuff
Toshiba TC86R4400MC-200
Toshiba TC86R4400MC-200 Top Side
TC86R4400MC-200
3370 JAPAN
9636YJA
Toshiba TC86R4400MC-200 Back Side
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Core Frequency:200 MHz
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:3.3 V
Introduced:05/1994
Manufactured:week 36/1996
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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The Toshiba / MIPS R10000 Processor
The R10000 'T5' is the first single-chip 4-issue superscalar processor by MIPS, introduced in 1995. It gave a 70 to 100% performance increase over the R4400 at 250 MHz, previously the most powerful MIPS processor. The R10000 CPU was used in NEC supercomputers and various SGI machines like the Indigo2, O2, Octane, Octane 2, Onyx, Onyx 2, Origin and Challenge.
 
References:  R10000 User Guide  R10000 at SGIstuff  NEC VR10000 announcement  T5: Brute Force (BYTE.com)
Toshiba TC86R10000-195
Toshiba TC86R10000-195 Top Side
TOSHIBA
TC86R10000-195
R2.7 9746AFB
JAPAN
Toshiba TC86R10000-195 Back Side
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Core Frequency:195 MHz
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:6,900,000
Circuit Size:0.25
Introduced:1996
Manufactured:week 46/1997
Made in:Japan
L1 Cache:32+32 KB
L2 Cache:8 MB ext.
Package Type:Ceramic
Goldcap
LGA-599
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Toshiba TC86R10000-200
Toshiba TC86R10000-200 Top Side
TOSHIBA
TC86R10000-200
R2.M 9726ACA
JAPAN
Toshiba TC86R10000-200 Back Side
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Core Frequency:200 MHz
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:6,900,000
Circuit Size:0.25
Introduced:1996
Manufactured:week 26/1997
Made in:Japan
L1 Cache:32+32 KB
L2 Cache:8 MB ext.
Package Type:Ceramic
Goldcap
LGA-599
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