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Although the Vdimm has nothing to do with the CPU itself, it plays an integral part in the big picture. If we are running a synchronous mode (1:1), the CPU's FSB and RAM MHz go up at a 1:1 ratio. For every 1MHz increase in FSB speed, the RAM speed will increase by 1MHz. So in these cases an elevated memory voltage will often prove helpful in maximizing the overclocking potential of the CPU.
A few points to consider when raising memory voltage:
Like CPU overclocking, increasing memory voltage should be done in the smallest increments available.
0.3 Volts over Default - That's a bit conservative for some people (including me), but should be enough for most. This is also the maximum provided by most motherboards. On such motherboards, hardware mods or modified bioses maybe required to gain access to more voltage.
Some of the higher voltages (2.9v to 3.3v) available on certain motherboards may damage the RAM with long exposure, so check with other people who have your RAM to get a feel for its voltage tolerance. The memory you save may be your own.