Because it is an OEM part, Acer does not provide a standalone "motherboard manual". To find official documentation, you must search for the of the computer model it came in (e.g., Gateway DX4870) on the Acer Support Website . Quick Technical Specifications
The Acer IPIMBAR REV 102A motherboard also boasts a range of innovative features, including: acer ipimbar rev 102a manual link
You do not need a manual to know that pre-builts are restrictive. Here is the upgrade cheat sheet based on the board's schematics: Because it is an OEM part, Acer does