You card is Kepler? I used(in 2011)a guide to adjust my AGPM, but this is for Fermi cards... if you have Kepler, so... i think this cannot work to you.
Yes, it's a Kepler. I have the AGPM edits with the 13,2 SMBios and the 660M replaced by my GTX 650 OC. It shows loaded and working in Console. For the most part it works fine, the only issue I have is with the programs mentioned above and a few more. Games scale down just fine.
My issue is that by opening any program like preview or some of the benchmark programs and even FaceTime. The GPU will scale up to 100% frequency and will not come down once I finish using the said program. This will bring temperatures of around 10c higher. My GPU now is at 324mhz core and 648mhz memory, if I open preview it will shoot up to 1.11ghz and 5.00ghz respectively and will not scale down.