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Toshiba R4000
  Toshiba TC85R4000PC-50
  Toshiba TC85R4000SC-50
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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
add comment
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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