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> Can any of you guys address this? Why can I turn HLSL all the way up to 14 while you
> guys can't? Is my graphics card special?

It's not special, it's just math..

Prescale is simply multiplying the X,Y resolution of the game your running by your chosen amount and then down samples the image to the resolution of your screen.

HLSL relies on the bandwidth of your GPU and the 680 has 192GB whilst my old Radeon 4850 (now retired for a Nvidia 760 also with 192GB) which struggled with anything over a prescale of 6 had just 60GB of bandwidth, less than a third of what you have with your 680, hence being able to go up to x14.