[Help needed] Underclocking Nvidia GT 630m

[Asycid]

Hi there!

My friend has a Packard Bell EasyNote TV44-HC notebook with a Nvidia GT630m 2GB graphics card (renamed 540m). The problem is that no matter what he do, if its temperature reaches 80 celsius degrees (before the BIOS update it was 75C), the GPU frquency drops somewhere to 230Mhz, and after it's cooled down to 70C, it raises back to 663Mhz (or 760Mhz [turbo boost I presume] or something like this), what is obviously not good. So the question is, how can I manually set a normal frequency (like 533 or something near it) to prevent the 80C throttle and to get a balanced performance? Or is there any solution to raise the throttle cap to 85C?

In Nvidia inspector, the GPU frequency has been greyed out, so I can't set it to any value. I can't set the FAN speed manually higher, because there is no software that can see the FAN.

So after some Furmarking, it fixes to 270 Mhz, and won't go anywhere until I shut down the notebook, and get out the battery for a minute. Please help.

Furmark's performance fluctuacion and nvidia inspector problem can be seen on the attached screenshot.

Thank you in advance.