DDR3 PC3-12800, DDR3 PC3-10600
Memory Type: DDR3 PC3-12800, DDR3 PC3-10600, DDR3 (non-ECC)
Maximum Memory: 8GB
Slots: 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
Intel HM77 chipset
Chipset is a set of integrated circuits that have a specific purpose in a computer system, a group of microchips used together to perform a single task.