Disabling onboard graphics will not disable the motherboard - it will only disable the onboaed graphics. Uninstalling the onboard graphics from within Windows and not having it connected will have the same effect.
You should check to see how much system memory is allocated to onboard graphics and set it either to none or to the minimum allowable by your motherboard. System RAM allocated to onboard graphics is not available to the system itself.
You should also be mindful of how much RAM is available in your system. A modern gaming PC needs at least 512Mb of RAM installed and available.
You need also be mindful that the 9250 itself is NOT a high powered display card - it is very much a low-end card. For good performance in modern 3D games an nVidia 6600GT or ATI X700 Pro should be considered the base level for games performance.
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Grandad
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since Mar 2004