Radeon HD 6550M Game Requirement Analysis
Radeon HD 6550M is a middle-class GPU based on the 40nm Terrascale 2 architecture.
It's based on the Redwood Core (therefore related to Radeon HD 5670) and offers 400 Shader Processing Units, 20 TMUs and 8 ROPs on a 128-bit memory interface of standard DDR3. Its central clock runs at 600MHz and the memory clock operates at 800MHz.
Therefore, it's a renamed Mobility HD 5650 and it should perform better than Radeon HD 6630M.
Using a 720p resolution, almost all of today's games are only playable at medium settings but with very fluent frame rates (40+).