Laptop exterior graphics by USB 3.0?

OK so i have a really nice dell laptop with the following specs:

Intel Core I-7 running at 2ghz with boost up to 2.5 ghz

640 GB hard drive ( i don't use that much space )

GT 525m (this is a piece of crap!!! you will see why later)

2 USB 3.0 slots (i know because they have 2 small ss's by each slot and the slots themselves are blue

So let me explain... When i try to run a demanding game on medium settings like GTA IV, i get around 25-35 Fps with that sh***y GT 525m. (it's because of the cards low clock rate)

I reallllllly want to be able to play GTA IV on high settings and other games on high with decent fps BUT i have that crappy graphics card. and everyone knows that you cannot actually change the graphics cards on laptops because both discrete and intergrated cards are intergrated on to the motherboard. the intergrated type graphics just depends if the GPU is intergrated on with the CPU.

So i did some research on external graphic and found a cool gadget that allows you to take an express card output from a laptop and hook it up to a chassis that you can install a Desktop graphics card ( for example an Radeon HD 6670) and run a seperate display from that chassis. the only problem is that i don't have a express card on my laptop so i can't connect that cool gadget to my laptop to that external desktop graphics chassis. GOD DAMN DELL I HATE YOU!!! I WILL NEVER BUY YOU EVER AGAIN!!!!

well anyway dell try'ed making up for being horrible by putting some SuperSpeed USB 3.0 outputs on the laptop. and USB 3.0 have a good bandwidth for external devices hence a graphics card.

so if someone could help me by showing me what to buy or if anyone can't find a way to hook up an external graphics card with the two USB 3.0's i have, then please please tell me.

-Thanks for any help and links you post etc... it's greatly appreciated! :-)

So if anyone could help me out with