That does not explain how those magical performance boost comes from...

Taking Intel numbers as 100%....

Especially for Lost Planet & Quake 4 = (100% - 60%) / 60% = 66%

Unreal Tournament 2 = (100% - 80%) / 80% = 25%

Those are not small numbers, unless you are comparing a single GPU versus dual GPU, as in single versus CrossfireX/SLI.

The most probable explanation would be comparing AMD's HD3300 IGP against a poor Intel's GMA X4500 IGP.