AB560A HP 16-GB DDR Memory Quad (4 x 4GB DIMMs)

AB560A is a 16-GB DDR memory quad of four 4GB DIMMs, for the HP 9000 rp4410 and the HP 9000 rp4440. HP calls the option the 16GB quad DIMM for the rp44xx server memory, and its spare is AB475-69001, a 4.0GB DDR-SDRAM module. The servers use DDR SDRAM DIMMs with ECC and chip spare protection.

Memory goes in sets of four DIMMs, called quads, and all four DIMMs in a quad must be of equal density. The minimum is 1 GB (four 256-MB DIMMs) and the maximum is 128 GB, using eight 16-GB quads such as AB560A in the memory carrier board A9739B. Quads with the largest capacity go in the lowest-numbered slots of the board.

Each server is ordered with one of two memory carrier boards. A9738B takes 4 to 16 DIMMs (1 to 64 GB) and A9739B takes 4 to 32 DIMMs (1 to 128 GB), both with 12.8-GB/s memory bandwidth, so the main difference between them is total memory capacity. The other quads for these servers are A7128A (1 GB, 4 x 256MB), A7129A (2 GB, 4 x 512MB), A7130A (4 GB, 4 x 1GB) and A7131A (8 GB, 4 x 2GB).