Because a traditional PDF manual is scarce, here are the critical specifications extracted from the hardware:
Lenovo IS6XM Rev 1.0 is a microATX motherboard commonly found in Lenovo ThinkCentre M81 and M91/p series desktops. While a single official retail PDF is rare, detailed technical data and service instructions are provided in the ThinkCentre Hardware Maintenance Manual Core Specifications Form Factor : MicroATX (24.5cm x 24.5cm). : Intel Q67 (Cougar Point). CPU Socket : LGA 1155. Processor Support : Supports
First, let’s demystify the nomenclature. is an OEM motherboard designed by Lenovo (originally IBM) primarily for ThinkCentre M series desktops (e.g., M58, M58p, and some early M90 models) around 2008–2010. The "Rev 1.0" signifies the first production revision. Lenovo Is6xm Rev 1.0 Motherboard Manual
(Looking at the board with the pins facing you, typically the missing pin is top-right or bottom-left depending on the exact generation, but usually bottom-right pin 8 is missing).
LGA 1155 socket supporting 2nd Generation Intel Core i3, i5, and i7 processors (Sandy Bridge). It features the Intel Q67 chipset. Because a traditional PDF manual is scarce, here
This motherboard serves as a robust foundation for Sandy Bridge-era systems, offering the following key specifications: : LGA 1155 (Socket H2). Chipset : Intel Q67 Express. Form Factor : Micro-ATX (24.5cm x 24.5cm). Memory : 4 x 240-pin DDR3 DIMM slots. Audio : Realtek ALC662 High Definition Audio. Networking : Intel 82579LM Gigabit Ethernet. Processor & CPU Compatibility
Lenovo uses a non-standard 14-pin header for front panel connections. If you are moving this board to a standard case, use this layout: Pins 1 & 2 Power LED: Pins 3 & 4 HDD LED: Pins 5 & 6 CPU Socket : LGA 1155
For those needing deeper technical documentation:
This manifests as fans spinning, possibly a beep code, but the system never posts or continuously restarts.