Motherboard Manual =link= - Lenovo Is6xm Rev 1.0

The manual spec limits you to (2x8GB sticks). If you install 16GB and the system only recognizes 8GB or fails to boot, ensure you are using standard voltage (1.5V) DDR3 memory. Many high-performance gaming RAM sticks require 1.65V, which this board may not support stably.

BIOS updates for this board are typically done via a Windows-based flasher found on Lenovo's site, supporting UEFI and Secure Boot. 6. Troubleshooting Lenovo Is6xm Rev 1.0 Motherboard Manual