A6098A HP 4 GB SDRAM Memory Quad (1024 MB DIMMs)

A6098A is a 4 GB high-density SyncDRAM memory set of four 1 GB (1024 MB) DIMMs. The single-DIMM spare for it is A6098-69101, a 1 GB high-density SDRAM DIMM. HP custom designs the DIMMs, each built with 36x4 SDRAM chips qualified to run at 125 MHz.

A6098A is the earlier-generation number for the 4 GB quad. It is the rp7410 number on the HP 9000 rp7420, the rp7410-8 number on the HP Integrity rx7620, and the rp8400 number on the rp8420 and rx8620. The number for the same 4 GB quad size on the current servers is AB308A. HP 9000 rp7410 modules carry forward to the rp7420, and rp8400 modules carry forward to the rp8420.

Memory goes in as quads, four DIMMs of equal size, in four densities: 2 GB (4x512 MB), 4 GB (4x1024 MB), 8 GB (4x2048 MB) and 16 GB (4x4096 MB). The minimum is 2 GB per cell. With 1024 MB as the only DIMM size, the maximum capacity is 32 GB on the rp7420 and rx7620 and 64 GB on the rp8420 and rx8620. Each cell board takes up to 16 DIMMs, and quads fill in this order: 1st (0A, 0B, 1A, 1B), 2nd (2A, 2B, 3A, 3B), 3rd (4A, 4B, 5A, 5B), 4th (6A, 6B, 7A, 7B).

A cell performs best with a multiple of 8 DIMMs, which is two quads, because it takes 8 DIMMs to populate both memory buses; a single bus delivers only half of the 16 GB/s peak bandwidth of a cell board. A partition can hold 4 GB DIMMs or the non-stacked 512 MB, 1 GB and 2 GB DIMMs, not both, and the 16 GB quads cannot be mixed with other sizes.