It also says that they compared the 6750 to the 330m. The 6750 is fine, the 6490 is garbage. If it's important at all, you'll need to see actual benchmarks before you decide if it's good enough for you. I wouldn't trust the bar graphs.
For example:
A situation where the 6750 gets 40fps and the 330m 30fps could become 10fps and 3fps respectively with the settings turned up, thereby getting you 3x eventhough the former is the more realistic situation. Also, HL2 and the Portal are not the most demanding games, the engine used in them is several years old now.
I'm not saying this is necessarily the case.