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Hardware queries for my laptop

I have a VAIO T series laptop with i5 Dual Core processor.

Product site:
http://www.sony.co.in/product/svt13126cn

Q1. What is the difference between i3 Quad Core and i5 Dual Core (Intel Core i5-3317U CPU@1.70GHz), which one is more powerful for gaming.

Q2. I have 2 USB ports can these ports be extended.

Q3. My laptop has a 128 GB  SSD, can the SSD be extended to bigger capacity in future
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Also I am not aware of any i3 Quad core CPU. Most are dual core, but they may have hyperthreading included, which adds an additional thread per core, so the OS looks at it as if it were a Quad core CPU. I5 CPU's on the other hand are available as Quad Core CPU, and also they have Hyperthreading, so a Quad core i5 would look as if it had 8 cores to the OS, a dual core i5 would look as if it had four cores to the OS.

Generally i3's are lower end CPU's than i5's. Also the built-in GPU of i3's and i5's are normally lower-end, and a good GPU is usually one of the important factors for gaming. So if a certain PC is available with both, i3 and i5 CPU's, you'd want the i5 version if you need more power. But of course this does not need to be true if you compare an "old" i5 with a "new" i3, but as usually the old and new CPU's need other mainboards with different sockets, you can't change between old and new on the same PC, so the comparison doesn't make too much sense.
be aware if you connect multiple devices to the same usb port (over a hub) you split the usb bandwith
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As of 2012, when a purchased my laptop how would a fast dual core i3 processor compare to a low power Core i5-3317U.
just check them out on the cpu benchmardk posted above!
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on checking the cpu benchmark, this is an average processor. Not even close to the best intel core i3.

So what did i get by paying for a i5 and getting an average i3 in return
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