Why does it matter? You only overclock if you need too, or over volt for that matter - in any case buying a new card eliminates the need for this period.
I had to undervolt my laptop to keep it from melting itself as well as under-volting the Video card in it because frankly it was a high powered card for a laptop that couldn't handle the heat (design problem).
The difference here is I had no choice in doing this, otherwise playing aces high for 30 seconds would crash the laptop due to heat.
In your case I don't even SEE a reason to use furmark or bother with overclocking for any purpose other then destroy a video card.
Why not just buy some lego's and build something then drop a cherry bomb on it to see what happens? more entertaining and less money your parents spend.
