2. The reason you might upgrade a graphics card
is if you want to play high res games like
diablo.
You would also swap your graphics card if you
wanted the graphics to be better in videos and
pictures etc…
3. usb3 will pretty much take over usb2 because
usb3 can transfer more information a lot
quicker. Example a movie is being transferred
on to a usb2 and will take 1.30 hours, if the
movie was being transferred to a usb3 it would
take 30 minutes
4. The reason to install a Wi-Fi card is so you can
connect to a wireless modern so there is no
wires any ware.
5. The risks of installing the following items are you
might get static energy and sap the new graphics
and brake it. To prevent this you can wear a
antistatic wrist band.
You might brake the part by putting it in the
wrong way or forcing it in the slot. To prevent
this read instructions and it should tell you how
to put it in the machine and you must never force
anything because it is design to fit properly.