HP Original Memory for upgrade or replacement parts use.
AD275A
4Gb (2 x 2GB) DDR2
AD276A
8Gb (2 x 4GB) DDR2
AB566A
16Gb (4 x 4GB) DDR2
AH405A
32Gb (4 x 8GB) DDR2
AB565A
8Gb (4 x 2GB) DDR2
AB564A
4Gb (4 x 1GB) DDR2