The HP 9000 rp8400 is a cell-based server with PA-8700 class processors whose chassis upgrades to the rp8420, rp8440 and rx8620. Each of those upgrade paths carries specific parts forward and leaves others behind. The rp8400 cell board cannot be carried into an rp8420, rp8440 or rx8620 and has to be replaced, with cell board and PA-8700/8700+ return credits available for the swap. Processors on the rp8400 were 650 MHz modules and 750 MHz and 875 MHz single processors, and the rp8400 could move up to Intel Itanium 2 and mx2 processors in the rx8620.
Memory from the rp8400 carries forward to the rp8420 and rx8620 but not to the rp8440 or rx8640. The rp8400 quads are A6097A (2 GB, four 512 MB DIMMs), A6098A (4 GB, four 1024 MB DIMMs), A6100A (8 GB, four 2048 MB DIMMs) and A6802A (1 GB), and they correspond to the AB307A, AB308A and AB309A quads of the rp8420 and rx8620. The older PCI backplanes of the rp8400 are replaced with PCI-X backplanes by the chassis upgrade kit, which is A9785A for the rp8420. Of the 32 I/O adapters available for the rp8400, 24 work in an rx8620.
Core I/O depends on build date. Servers ordered before September 2003 were supplied with a core I/O that is not supported in the upgrade to an rp8420 or rx8620 and is replaced by AB306A. Servers ordered after September 2003 were delivered with A7109A, which is supported and needs no replacement; the A7109A core I/O in the rp8400 Server Expansion Unit A6434A stays as well, and that unit takes the AB328A bezel when moved to an rx8620. Disks (A6831A 36 GB, A6725A 73 GB, A7083A 146 GB), the A6180A DVD-ROM and A6182A DDS-4 drive carry forward, and rp8400 servers shipped with four AC power cords. Disks, media and DC power supplies also carry to the rp8440 and rx8640.
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rp8400 parts we supply
Memory (4)
| Option number | Description | Part page |
| A6097A | 2 GB memory quad (4 x 512 MB DIMMs) | View part |
| A6098A | 4 GB memory quad (4 x 1024 MB DIMMs) | View part |
| A6100A | 8 GB memory quad (4 x 2048 MB DIMMs) | View part |
| A6802A | 1 GB memory quad (128 MB DIMMs) | View part |
Core I/O, expansion and upgrade parts (5)
| Option number | Description | Part page |
| A6096A | Core I/O card, rp8400 servers ordered before September 2003 | View part |
| A7109A | Core I/O card, supplied with rp8400 servers ordered after September 2003 | View part |
| A6434A | HP 9000 rp8400 Server Expansion Unit | View part |
| AB328A | Front bezel for upgrading an rp8400 Server Expansion Unit | View part |
| A9785A | Chassis upgrade kit, rp8400 to rp8420 | View part |
Disks and media (5)
| Option number | Description | Part page |
| A6831A | 36 GB 15,000 RPM disk drive | View part |
| A6725A | 73 GB 10,000 RPM disk drive | View part |
| A7083A | 146 GB 10,000 RPM disk drive | View part |
| A6180A | DVD-ROM drive, 650 MB, 6.75 MB/s | View part |
| A6182A | DDS-4 tape drive, 40 GB, 21.6 GB/hour | View part |