HP 9000/T500, T520, T600 & 890

Quick Facts
Introduced 1993, 93, 95, 97
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 T-Class servers are 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 the basic system design of the T-Class was discontinued in favor of the more flexible Superdome systems.

Model numbers and introductions dates:

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 documenation is not explicit about it
  2. The off-chip caches of all CPUs are quite 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.





External connectors




Operating systems

The 890 servers support only HP-UX:

The T-Class also only support HP-UX:


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

Compare these with other results on the Benchmarks page.


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