Memory Type: DDR PC2700, DDR PC3200, DDR (ECC)
Maximum Memory: 64GB
Slots: 32
Each memory slot can hold DDR PC2700, DDR PC3200 with a maximum of 2GB per slot.*
*Not to exceed manufacturer supported memory.
Up to 64GB of PC2100 or PC2700 DDR SDRAM, running up to 266MHz with Advanced ECC, 48GB of PC2700 running at 333MHz or 32GB of PC3200 running at 400MHz.Installed in pairs of modules.This system supports a maximum of 4 memory cards. Each memory card has 8 memory sockets divided into 4 banks of 2.
How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found here.
Memory or DRAM is the 'working' memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis.
video - installing memory