No visible performance increase with Radeon 5450 and OSource drivers

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http://askubuntu.com – I have been running my machine without GPU for a while with decent results (no lag for a decent internet use, videos read smoothly and 2D gaming is OK). But I decided to see what I could get with an actual GPU, and acquired a cheap Radeon 5450 low profile card from a local store, just to try it out. (a picture here for the record, http://www.chaotiqueneutre.com/pic/SAM_2490.JPG I know it's not much but that's just for testing) After installing the open source drivers (with some trouble), I can see absolutely no difference performance-wise. I have installed Left4Dead2 to compare the performa (HowTos)