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HP N4000 (rp7400, N-Class)

Quick Facts
Introduced 1999-2001
CPU 1-8 PA-8500/
1-8 PA-8600/
1-8 PA-8700
360-750 MHz
Caches 1.5-2.25 MB L1
RAM 32 GB
Design Stretch
Drives 2 SCSI
Expansion 12 PCI
Bandwidth System 4.2 GB/s
CPU 17 GB/s
Mem 8.5 GB/s
I/O 6.4 GB/s
XBAR 15.3 GB/s
I/O SCSI
3 serial
100E
100E console

Overview

The HP 9000 rp7400 were mid-range PA-RISC servers and the original HP 9000 N-Class N4000 from the turn of the century. The original N4000 (rp7400) is based the Stretch system architecture, also used in the L1500 and L3000 (rp5430/rp5470) servers. Later rp7405 and rp7410 servers were also labeled N4000 and feature a similar set of I/O options and expandability in basically the same chassis, with a completely different system architecture, the Cell.

N4000s were shipped in two models with different system board, A3639A and A3639B. The N4000 that was later renamed to rp7400 was shipped with an even different mainboard and had the model number A3639C.

Model numbers

Internals

CPU

The rp7400 N4000 supports one to eight processors.

The original N4000 (A3639A and A3639B) and later rp7400 (A3639C) are in fact different products, based on the same basic architecture but with slight differences, especially relating to the type and number of processors. Not all early N4000s support the later processors and a maximum number of CPUs.

Processor types are indicated with the following suffixes:

Chipset

The rp7400 system is based on the Stretch chipset, used in the L1500 and L3000 (rp5430/rp5470) servers as well. Stretch has four main components:

  1. Prelude memory controller, is the main crossbar of the system
  2. Four DEW Runway converters, attach the processors to the main buses
  3. Two IKE I/O controllers connect the PCI bridges via I/O channels
  4. 14 Elroy PCI bridges (LBAs) convert the IKE I/O to PCI buses

The rest of the system is implemented with common parts:

» View a system-level illustration (ASCII) of the N4000’s system/bus architecture.

Buses

The system bus architecture is interesting as it provides more bandwidth than could be used under practical circumstances. The designers probably counted on future CPU upgrades, such as Itanium processors.

Memory

Expansion

Drives

External connectors

References

Manuals

Operating systems

Benchmarks

Model SPEC2000, int SPEC2000, fp SPEC2000
rate, int
SPEC2000
rate, fp
N4000-6X
rp7400
493 489 5.7
2-CPU: 11.3
4-CPU: 22.1
8-CPU: 42.6
5.7
2-CPU: 10.4
4-CPU: 19.3
8-CPU: 30.5
N4000-7X
rp7400
551 524 6.4
2-CPU: 12.5
4-CPU: 24.6
8-CPU: 46.7
6.1
2-CPU: 11.0
4-CPU: 20.5
8-CPU: 32.1

Compare these with other results on the Benchmarks page.

Dimensions

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