BAP,
Precision X doesn't give the option of adjusting the shaders - if I remember right - Micro is running Precision (note no X - see links below) on video cards that are 400 and 500 series - with our 600 series, we don't appear to have the option of just adjusting the shaders. I tried about 3 different GPU overclocking programs and with our 600 series cards - they all have the GPU clock off-set for over-clocking. From what I've read - Precision X was developed for the 600 series cards.
Micro and I had quite a discussion on this when I installed the 660 card and got brave enough to try overclocking it.
Sun :-)
You can scroll down to the screen shot - this one is more what Micro is seeing with Precision.
http://downloads.guru3d.com/EVGA-Precision-v2.1.2-download-2817.html
While this one is more what you and I see with Precision X.
http://www.evga.com/precision/#Features