I told you that little trick would work.
You can only use ThrottleStop to unlock the multiplier on the Extreme CPUs or on the T7600. All of the other Core 2 CPUs have a locked multiplier that can't be unlocked with software.
Edit: I found two T7600 CPUs, one with an sSpec number of SL9SD and one with sSpec number SL9SJ. Both have the same CPUID 0x6F6 and B2 stepping.http://ark.intel.com/Product.aspx?id=27257
Edit #2: This site shows the T7600G as SL9U5.http://www.cpu-world.com/CPUs/Core_2...7GF0534MU.html
The Intel site doesn't list SL9U5.
With an unlocked multiplier, no bios overclocking options are necessary since ThrottleStop is writing directly to registers within the CPU.
1.50V is the maximum VID that Core 2 mobile CPUs support. The early 65nm Core 2 CPUs are pretty tough so you probably won't have trouble running with this much voltage. I used to run my E6400-B2 CPUID 0x6F6 for a long time at 1.500 volts without any issues and it is still running fine today. A VID setting of 1.500 usually results in about 1.45 volts actual core voltage at full load on many motherboards. Most software does not show actual core voltage on laptops.
With the next version of ThrottleStop, I will change it so you won't need to enter the Extreme=1 key to access this feature. It will treat your T7600 just like any other Extreme CPU with an unlocked multiplier.
ThrottleStop uses high performance timers within the CPU and can accurately detect the slightest change in the CPU multiplier. RM Clock draws some nice graphs but it's not as accurate when detecting throttling. When searching for reviews of the T7600, the biggest complaint seemed to be about throttling so it would be a good idea to keep an eye on that when overclocking these CPUs. They put out a lot of heat when you crank up the voltage and MHz.
In your screen shot, ThrottleStop is either fighting against RM Clock or it is fighting against your Windows power option setting. TS works best if you set the minimum processor state to 100%. If you only want to use ThrottleStop to unlock your multiplier then you can do that and exit ThrottleStop and use RM Clock instead. Once the CPU has been unlocked, it will remain unlocked until the next time you boot up.
What is the maximum multiplier that your bios lets you select?
Thanks for testing this feature out for me. I wish I had access to an infinite number of CPUs but I don't so user testing really helps me out.