AB453A HP 2-GB DDR2 Memory Pair (2 x 1024MB DIMMs)

AB453A is a 2-GB DDR2 memory pair made of two 1024-MB DIMMs, for the HP 9000 rp7440 and the HP 9000 rp8440. The DIMMs are custom designed by HP, with DDR II memory chips and full ECC protection, and the rp8440 DIMMs are qualified to run at 267/533 MHz. The spare modules for AB453A are A9843-69001 and A9843-69101, each a 1.0GB DIMM memory module on Double Data Rate 2 (DDR2).

Memory must be installed in pairs of two DIMMs of equal size, with a minimum of 2 GB per cell. On each cell board the pairs go in the order (0A, 0B), (1A, 1B) and so on up to (7A, 7B), and larger DIMMs are loaded first across a cell, followed by progressively smaller sizes. Each cell board takes up to 16 DIMMs, with 16 GB/s of peak memory bandwidth in the rp7440 and 17 GB/s in the rp8440.

AB453A is the 2-GB pair. The 4-GB pair is AB454A (two 2048-MB DIMMs) and the 8-GB pair is AB455A (two 4096-MB DIMMs). Memory modules from the rp7410, rp7420 and rx7620 cannot be carried forward to the rp7440, and modules from the rp8400, rp8420 and rx8620 cannot be carried forward to the rp8440.