Lenovo ThinkPad W520 Series Intel Chipset QM67 SLJ4M Socket rPGA989 nVidia Quadro 1000m 2GB DDR3 Laptop Motherboard 04W2028 11S04W2028.
Chipset: Intel QM67
Socket: Intel rPGA989
Max Supported Memory: 16GB max for Dual-Core processor, 32GB max for Quad-Core processor
Number of Memory Slots: 4
Memory Type: DDR3 SDRAM
Video Chipset/GPU Model: nVidia Quadro 1000m
Graphics Memory: 2GB DDR3
Type: Laptop Motherboard