Galaxy GTS250/9800GTX no reference vmod?

[Royalk]

Hi, every one, here I found the galaxy GTS250 uses a RT8841 power supply chip. I also found the pin configurations for RT8841 (FB is pin #6). The stock vGPU is 1.2V, the board also have a jumper to set the vGPU to 1.3V(maybe). Can anyone sketch a wire/resistor connection to do the vmod down to 1.1/1.15V? Thanks!