the "big plug " goes in to a sata connection from your power supply the same ones one your sata hard drives (: and the fan one goes on the cpu fan header
@Mr. Martin
^ I don't understand the crashing bit, what the PC crashes? or what.
Well the normal result of a failed mild overclock is the test crashing then screen might go black as its just resetting your graphics card as it could not run at them settings
Leave your CPU there is no need to overclock that and GPU's are quite simple to overclock using a program like EVGA precision X
Real simple overclock guide using EVGA precision X:
Turn the power target to full
and your GPU clock offset to around 50 MHz and keep bumping it up by +10 until it...
So after watching this video and reading about this Kickstarter it looks quite intresting and fun
https://www.kickstarter.com/projects/asylum/identity/description
Loot Crate
Loot crate is a monthly subscription based giftbox where you get some geeky goodies and this months theme was "Rewind" most boxs you get a Tee inside then maybe a figure of some sort and a comic book plus some other little extra goodies.It can be great fun getting a box of unknown...
As far as I know you most likely wont have a bottle neck there and its just a waste of money as it does a good enough job. Should of just got a GTX 980 ;)
@Unlucky George or @lionel might be able to give you a better answer than me