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4gb RAM

Hello, I know a little about computers, but when it comes to updating hardware (graphics card) for gaming, I am clueless. I am going to college and want to know if it is possible for me to upgrade my laptop, and what it would involve (graphcis card, processor, etc). I mostly play shooters. Any help in identifying my graphics card slot, and telling me what would be compatible would be appreciated. This includes information such as how much power can my processor handle, and if an upgrade is reasonable, and what kind of difference it would make. Thanks SPECS Dell Studio 1745 Microsoft Windows 7 Home Premium Intel Core 2 Duo CPU T6600 @2.20Ghz, 2200 Mhz, 2 Core(s) current graphics card= Mobile Intel 4 Series Express Chipset Family