Warning!!
This mods could damage your hardware, use your own risk. If your unsure about the mods, Do not implement them.

The Biostar Tforce 965PT/Deluxe have a good potential overclocking. But Tforce 965PT stuck on Vdimm memory that only could reach 2.2V, many users are finding this not sufficient for higher memory speeds.

This mod the will allow the user to adjust Vdimm to 2.5V or higher. Thanks to Biostar using a Pulse Width Modulated Vdimm power supply that is driven by a DS9202 PWM Integrated Circuit that is powered from the +5V bus.

the pictures:

You can connect to Vdimm jumper by setting to 2.2v, you only can adjust the voltage via the trimpod/VR not from bios, but if you set the Vdimm jumper on default setting, you can adjust via bios (ex. at Vdimm jumper default, you set the VR @2,2v. So you can change more Vdimm voltage via bios, its very simple!!)

source from http://www.rebelshavenforum.com