Framerate wise the X1950Pro is better than the Intel HD4000 so it would be much better than the G630. Although your electric bill would thank you if you upgraded that later on
. Otherwise the Integrated graphics supports more features but would likely be to slow for you to use them anyways.
If you were to run integrated graphics I think the only integrated card today that would be on par with the X1950Pro or faster would likely be AMD's Trinity 7660D found in AMD's FM2 based A10 processors, because even the Llano 6550D (Llano A8 series) would be slightly slower most of the time.