Memory Type: SDRAM, PC133, SDRAM (non-ECC)
Maximum Memory: 2GB
Slots: 4
Each memory slot can hold SDRAM, PC133 with a maximum of 512MB per slot.*
*Not to exceed manufacturer supported memory.

AGP graphics version supports up to 2GB with 512MB modules, but the PCI graphics version will only accept up to 1GB using 256MB modules.

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