Dell Inspiron N4110 - 2nd generation Intel(R) Core(TM) i3-2310M Processor (2.1GHz, Dual Core, 4T, 3MB L3)

Hi Guys , 

I am using Dell inspiron N4110 now i would like to upgrade my graphics card  and RAM.? Can any body tell me the which  ATI graphics card  and what is the maximum RAM supports by  the N4110. Below is my laptop details.

Laptop - Dell N4110

Processor - 2nd generation Intel(R) Core(TM) i3-2310M Processor (2.1GHz, Dual Core, 4T, 3MB L3)

Current Graphics card - AMD Radeon(TM) HD 6470M - 1GB (For ICC)

Current RAM - 3 GB

Is it necessary to having a graphics card  to play the high volume games like Modern Warfare or Can i play these games with Intel HD 2000/3000 video cards.

Please let me know the suitable graphics card and RAM for the above mentioned  configurations.

Thanks in advance.

Regards,

NJ