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You don't have a graphics card, you have a graphics chip.
Most likely Dell has configured a maximum cap on the RAM that may be shared with your graphics chip. Nevertheless, Dell is absolutely terrible with heat dispersion, and your computer is almost certainly overheating.
Try buying a can of condensed air to clean out the ducts as stated, or consider investing in a laptop cooler, or both.
Additionally, consider reducing DirectX to version 9.
To be brutally blunt, the specifications on your computer are not meant for any game above the level of Starcraft in terms of hardware performance. It was designed purely for entry level office work.
The "Windows Experience Index" is indicative. I anticipate your WEI to be constrained by your graphics chip, making it around 3.5, which is not an accurate indicator, but indicates well enough that you will be limited to old games. Anything new will fry your computer.
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