[G51] GPU automatically downclocking on battery (AC off)

Hi everyone.
I think my problem does not just concerns G51 serie. But I didn't find any solution or even a thread talking about it yet.

Notebook : ASUS G51-Jx (model : G51JX-SX383V)
GPU : nVidia Geforce GTS 360M
Problem : when the notebook is on battery (AC unplugged), the GPU drastically and automatically downclocks itself. So, it decrease dramatically the performances ingame.
- Normal frequencies : GPU : 550 MHz / MEM : 1800 MHz = AC ON
- Limited frequencies : GPU : 405 MHz / MEM : 325 MHz = Battery ON

I've looked on my own for different ways to bypass that limitation, unsuccessfully :
- Nvidia control panel : I've tried switch to "prefer maximum performance" option, no change.
- Drivers change : I've tried the official ASUS drivers, the latest nVidia Verde, oldest nVidia ones : fail.
- PowerMizer : it's a nVidia drivers feature that limits GPU and MEM clocks frequencies on battery to enhance the autonomy. However, it can cause several issues.
I've tried 2 softwares usually recommended to disable it : nVidia PowerMizer Manager and PowerMizer Switch. They work but cant exceed the 405/325 limitation on battery.
- O/C (overclocking) : I've used MSI Afterburner. It works perfectly on AC, but doesn't work anymore on battery (neither O/C or D/C is possible).
- BIOS editor : Using NiBiTor (NVIDIA BIOS Editor) and Fermi BIOS editor. None of them can access the BIOS of this GPU.

-> It's like when on battery, 405 MHz for GPU and 325 MHz for MEM are upper limitations that cant be exceed, no matter how.
I’m not sure there’s a solution, I’m thinking this is a modded BIOS limitation.

If you have a solution or an idea, I would be very interested.
Thanks for your help.

 

Battery wattage provided is lower than AC wattage provided, it downclocks automatically, that's how all mobile gpu's work.

 

Ok, thanks for this information.