Geforce 820M is Probably the First Maxwell Mobility Graphics Chip - Nvidia Silently Updates Specs Chart
GeForce GT 550M vs GeForce GT 820M
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NVIDIA silently launches GeForce 820M, the first graphics card from GeForce 800 series | VideoCardz.com
GeForce GT 630M Rev. 2 vs GeForce GT 820M
Solved: Issue installing NVIDIA GeForce 820M drivers for Windows 7 6... - HP Support Community - 4149372