The IS6XM uses a standard 24-pin ATX and 4-pin CPU power connector. This makes it easier to use with modern aftermarket PSUs compared to newer Lenovo boards that use proprietary 10-pin or 14-pin main power.
: Includes 4-pin PWM headers for the CPU, Front System, and Rear System fans. Rear I/O and Expansion
4x DDR3 DIMM slots (Dual Channel, max 16GB or 32GB depending on BIOS) Micro-ATX (Proprietary Lenovo mounting holes) Expansion 1x PCIe x16, 1x PCIe x1, 2x PCI Storage 4x SATA ports (SATA 3.0 support on specific ports) 🔌 Front Panel Pinout (Critical)
You can view the technical 65-page document on Scribd or download the official M91p Hardware Guide directly from Lenovo.