osam5a :
I have a laptop Dell latitude e6510 i am thinking to put a graphic card on it through a EXP GDC a device which can install a desktop size graphic card in laptop.. i need a graphic which doesn't cost that much and also doesn't bottleneck. BTW i have 4 gb ddr3 ram
Are you aware that you connect the EXP GDC device to an internal Mini PCI-E port?. You will have to leave the bottom cover open, unless you make a hole somewhere to route the cable.
At work they provide us with Latitude laptops, and I am very familiar with your laptop, which I got almost 8 years ago.
I think a GeForce GT 740 will do, anything above that will go to waste.