Supports up to 8GB or 16GB depending on the specific BIOS version and module density.
The manual highlights support for the LGA 1155 socket. This is the defining feature of the board. It supports the "Sandy Bridge" architecture. If you are looking to upgrade this system today, the ceiling is quite low. You can install an i7-2600 or i5-2500, but you cannot install 3rd or 4th generation Intel chips without swapping the motherboard. Acer H61h2-ad Motherboard Manual