5470 is better, I dont believe that HD 5470 can only run games on low settings,
I own a MSI cx420
Core i3 M 330 @ 2.13Ghz
4.00GB ddr3 ram
1GB ATI HD 5470
it can run Call of Duty : Black Ops in High Settings in 1360 x 768 resolution
AA is turned off.
based on my reviews, the power of your graphic cards is also dependent on
your RAM and Processor.
Site such as notebookcheck.net gives almost the most accurate FPS for your
notebook's graphics cards but as i am saying it will also depend on your
processor and ram