Radeon HD 6490M Game Requirement Analysis
Radeon HD 6490M is an entry-level GPU based on the 40nm Terrascale 2 architecture.
It's based on the Caicos Core (therefore related to Radeon HD 6450) and offers 160 Shader Processing Units, 8 TMUs and 4 ROPs on a 64-bit memory interface of fast GDDR5. Its central clock runs at up to 750MHz (800MHz if paired with DDR3) and the memory clock operates at 800MHz.
Despite being higher clocked than desktop Radeon HD 6450, it's expected to offer the same performance due to lower driver support.
Using a 720p resolution, almost all of today's games are only playable at low settings but with very fluent frame rates (40+).
Note 1: Radeon HD 6490M was later (2012) renamed and released as Radeon HD 7470M.
Note 2: There is also a DDR3 version of this card that has even lower bandwidth but comes higher clocked. Still, it's expected to perform considerably worse.