
HP N4000 (rp7405/rp7410)
4.36 HP N4000 (rp7405/rp7410)
4.36.1 Overview
The rp7405/rp7410 N4000 servers are up to 8-way multiprocessing servers and the smallest HP sys-
tems which can be partitioned into logical servers (two nPartitions). Based upon the same 10U rack-
mountable chassis as their rp7400/N4000 brethren, the newer rp7405 and rp7410 are built around
a completely overhauled system and I/O architecture. The “Core Electronic Complex” is a modified
version of the Superdome’s cell-based system architecture, limited to two cells, which each contain up
to four processors, sixteen memory slots and the central chipset — the cell controller (CC). These newer
N4000s feature a very large amount of system and I/O bandwidth: 16GB/s CPU, 8GB/s memory, 8GB/s
cell-to-cell and 8.5GB/s I/O bandwidth (all maximum aggregate values).
The rp7405 was apparently an entry-level version of the rp7410 — based on the same hardware and
with the same capabilities but shipped in smaller configurations. Upgrades to a “full” rp7410 were later
possible, probably including a modified firmware for unlocking the full functionality.
Introduced: 1999-2000
4.36.2 Internals
CPU
The rp7405 and rp7410 support from two to eight processors.
They are based on different system boards with different model numbers — the same basic architecture
but with differences relating to the type and number of processors.
A6752A (rp7410) supports 650MHz, 750MHz and 875MHz processors
A7111A (two-way rp7405) supports 650MHz and 750MHz processors
A7112A (four-way rp7405) supports 650MHz and 750MHz processors
A7113A (eight-way rp7405) supports 650MHz and 750MHz processors
Processor types are indicated with the following suffixes:
-6X: PA-8700 650MHz with 768/1536KB on-chip I/D L1 cache each
-7X: PA-8700 750MHz with 768/1536KB on-chip I/D L1 cache each
-8X: PA-8700+ 875MHz with 768/1536KB on-chip I/D L1 cache each
-9X: PA-8800 (dual-core) 900MHz/1.0GHz with 1.5/1.5MB on-chip L1 and 32MB off-chip L2
cache each
PA-8900 (dual-core) 800MHz-1.1GHz with 1.5/1.5MB on-chip L1 and 64MB off-chip L2 is
probably also possible (suffix and affected models unknown)
Itanium 2/IA64 processors are probably also possible on some models
It is unclear which models support the -8X, -9X, PA-8900 and IA64 processors
There are two CPU/memory cell boards, with each four processor sockets.
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