PA-RISC information - since 1999

HP 9000/T500, T520, T600 and 890

Quick Facts
Introduced 1993, 93, 95, 97
Period Maturity (III)
CPU 1-4 PA-7000
1-12 PA-7100
1-14 PA-7150
1-12 PA-8000
60-180 MHz
Caches 2-4 MB L1
(8 MB L2)
RAM 2-3.75 GB
Design Viper
Drives external
Expansion VSC
Bandwidth CPU 240 MB/s per CPU
890 sys: 240 MB/s
T5x0 sys: 480 MB/s
T600: 960 MB/s
I/O: ≤240 MB/s


The HP 9000 T-Class servers were large 32-bit PA-RISC mainframes from the mid-1990s, built with modular system cards that contain processors, memory or I/O devices. The main system backplane features sixteen slots, eight of which can be used for memory or processor boards, and the other eight for I/O boards and converters. These boards plug into the main system VSC bus at 60 MHz.

The HP 9000/890 was an early iteration of the architecture, with the later T500/T600 being updated sucessors. After the 64-bit T600 T-Class design was discontinued in favor of the more flexible Superdome systems.

Apparently 890 and T500 could be board-upgraded to T520, with an board-upgrade path to PA-8000 processors as well.

System Model number Introduced Price
890 HP 9000/890 1992
T500 HP 9000/891 1993/1994 $165,000 uni
$660,000 12-way
T520 HP 9000/892 1995 $145,000 uni
$520,000 14-way
T600 HP 9000/893 1997




  1. Not sure if this is really a PA-7000, the documentation is not very explicit
  2. The off-chip caches of the CPUs are rather large — especially on the 890 server
  3. The T600 was apparently the only system with a PA-8000 processor with L2 cache, while an L2 cache was not even mentioned on the PA-8000 documentation

Processor cards

The processor cards attach the processors and support chips to the main system bus via slots for processors, memory and I/O cards.

The 890 and the T-Class have slighly different architectures:


The chip configuration looks like a PCX processor, with CMUX and FP chips, the other parameters contradict this however, including the (main memory, clock speed, bus interfaces.

T500, T520 and T600


The chipsets depend on the plug-in I/O cards.

System buses


Expansion slots


External I/O

Operating systems


Model SPEC92, int SPEC92, fp SPEC95, int SPEC95, fp SPEC95
rate, int
rate, fp
T520 5.2 1-CPU: 47.2
2-CPU: 93.8
4-CPU: 186
8-CPU: 363
12-CPU: 531
T600 11.8 14.9 1-CPU: 106
2-CPU: 211
4-CPU: 418
6-CPU: 617
8-CPU: 814
10-CPU: 1003
12-CPU: 1192
1-CPU: 134
2-CPU: 263
4-CPU: 510
6-CPU: 735
8-CPU: 915
10-CPU: 1043
12-CPU: 1151


Height Width Depth Weight
1620mm 750mm 905mm 360kg




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