Graphic card issues

Oct 14, 2014
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I have a dell inspiron 15 3542. specs.-
intel i7(4th gen)
8 gb RAM
Nvidia GT 840M 2 gb graphic card
But still I am unable to play any high profile game like FIFA14, WATCH DOGS, COD, etc.
I have the latest nvidia drivers too.
It shows-
Total available graphics memory-4096 mb
dedicated video mem.-2048 mb
system video mem.-0 mb
shared system mem.-2048 mb
Please help me with the issue!!!