Performance comparison between ThinkPad X230 with Intel HD4000 and ThinkPad T520 with NVidia NVS 4200M – Ioannis Karagiorgos blog
Intel Core i7-2640M \ NVIDIA NVS 4200M or GeForce GT 520M \ Counter-Strike: Global Offensive - YouTube
NVIDIA Quadro NVS 4200M specs
NVIDIA NVS 4200M @ HWBOT
Finally joined the club. Upgraded from a NVS 4200m. Picked this up for 200, owner already upgraded to 16gb. : r/pcmasterrace
For IBM Lenovo Thinkpad T420 NVIDIA NVS 4200M Graphics 63Y1705 Laptop Motherboard Fully Tested All Functions Good Work|laptop motherboard repair|motherboard goodlaptop motherboard china - AliExpress
Dell Latitude E6420 Intel Core i5-2430M 4GB 1TB HDD Windows XP NVidia NVS 4200M | eBay