I'm not sure what you are driving at?
If you mod the 3.3 rail to increase the voltage, you are going to be twiddling a LOT more than just your
VDIMM. At least half the components on that board use the 3.3v rail (including the
CPU, IIRC). ALL of them would be affected. Not to mention that modding the 3.3v rail could only be done on your
PSU.
Or am I misunderstanding your question?