The "top" reason people search for the manual is a forgotten BIOS password or a failed overclock attempt. The H61H2-AD has a specific Clear CMOS jumper.
. Because it is an OEM part, a standalone "Acer" manual is rarely available; however, it follows the standard layout of the ECS H61H2-series. Acer Community Core Specifications
24-pin ATX main power and a 4-pin ATX_12V connector for the CPU. 4 to 6 SATA connectors (SATA 3Gb/s). 2x DDR3 DIMM slots, supporting up to 16GB. Expansion: 1x PCIe x16 slot for graphics and up to 3x PCIe x1 slots. The Retro Web Downloads and Official Support Acer H61H2-AD - The Retro Web
: It utilizes the LGA 1155 socket, supporting 2nd and 3rd Generation Intel Core i3/i5/i7 processors (Sandy Bridge and Ivy Bridge).
Because the H61H2-AD uses a and a modest VRM (voltage regulator module), do not install a 95W TDP processor (like the i7-2600K or i7-3770K). You risk overheating the power delivery.