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NEC VR4400
  NEC D30412RJ-50 VR4400MC
  NEC D30412RJ-75 VR4400MC
  NEC D30412LRJ-200 VR4400MC
  NEC D30412LRJ-250 VR4400MC
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The NEC 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.
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 NEC VR4x000 processors is the external clock speed, internal is twice that.
NEC D30412RJ-50 VR4400MC
NEC D30412RJ-50 VR4400MC Top Side
NEC JAPAN
D30412RJ-50
VR4400MC
9342I9201 ES2.0
NEC D30412RJ-50 VR4400MC 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:1993
Manufactured:week 42/1993
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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NEC D30412RJ-75 VR4400MC
NEC D30412RJ-75 VR4400MC Top Side
NEC JAPAN
D30412RJ-75
VR4400MC
9420K9206 2.0
NEC D30412RJ-75 VR4400MC Back Side
Note: The last two digits of the part number on older NEC VR4x000 processors is the external clock speed, internal is twice that.
 
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Core Frequency:150 MHz
Board Frequency:75 MHz
Clock Multiplier:2.0
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:3.3 V
Introduced:1994
Manufactured:week 20/1994
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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NEC D30412LRJ-200 VR4400MC
NEC D30412LRJ-200 VR4400MC Top Side
NEC JAPAN
D30412LRJ-200
VR4400MC
9509I9200ES3.0
NEC D30412LRJ-200 VR4400MC Back Side
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Core Frequency:200 MHz
Board Frequency:50 MHz
Clock Multiplier:4.0
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:3.3 V
Introduced:05/1994
Manufactured:week 09/1995
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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NEC D30412LRJ-250 VR4400MC
NEC D30412LRJ-250 VR4400MC Top Side
NEC JAPAN
D30412LRJ-250
VR4400MC
9609P9204 3.0
NEC D30412LRJ-250 VR4400MC Back Side
add comment
Core Frequency:250 MHz
Board Frequency:75 MHz
Clock Multiplier:3.3
Data bus (ext.):64 Bit
Address bus:64 Bit
Transistors:2,300,000
Voltage:3.3 V
Introduced:05/1994
Manufactured:week 09/1996
Made in:Japan
L1 Cache:16+16 KB
Package Type:Ceramic
Goldcap
PGA-447
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