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- Description
- Specifications
AB454A is the HP 4 GB (2 x 2 GB) memory pair, DDR2-533 at 4200 MB/s, single rank and registered. The 2 GB DIMM in the pair carries the numbers A9846-69001 and AD285A, a 2.0 GB DDR-2 memory module.
On the HP 9000 rp7440, the pair is the 4 GB size of the three the server takes: AB453A for 2 GB, AB454A for 4 GB and AB455A for 8 GB. The DIMM size is 2048 MB, and with that one DIMM size the maximum capacity is 64 GB. The system maximum is 128 GB, using sixteen 4 GB DIMM pairs. The HP 9000 rp8440 takes the same three pair numbers and the same pair rules.
Memory is installed in pairs, two DIMMs of equal size, in three densities: 2 GB (2x1024 MB), 4 GB (2x2048 MB) and 8 GB (2x4096 MB). The minimum is 2 GB per cell, larger DIMMs are loaded first across a cell, followed by progressively smaller sizes, and pairs fill each cell board in the order (0A, 0B), (1A, 1B), (2A, 2B), (3A, 3B), (4A, 4B), (5A, 5B), (6A, 6B), (7A, 7B).
Mixing DIMM sizes is supported beyond the recommended configurations as long as the loading rules are followed. The recommended 32 GB per cell is sixteen 2 GB DIMMs, and the 48 GB per cell recommendation is eight 4 GB DIMMs in slots 0A through 3B with eight 2 GB DIMMs behind them. Each cell board takes up to 16 DIMMs with 16 GB/s of peak bandwidth. Memory modules from the rp7410, rp7420 and rx7620 do not carry forward to the rp7440.
| Designation | AB454A |
| Manufacturer | HPE |
| Type | DDR2 registered memory pair |
| Pair size | 4 GB (2 x 2 GB) |
| Memory type | DDR2-533, 4200 MB/s |
| Rank | single |
| DIMM numbers | A9846-69001, AD285A |
| DIMM size | 2048 MB |
| Maximum with this DIMM size (rp7440) | 64 GB |
| Minimum memory | 2 GB per cell |
| Other pair numbers | AB453A (2 GB), AB455A (8 GB) |
| Servers | rp7440, rp8440 |