How to voltage mod the P4T-E
Disclaimer: this mod will be extremely risky if you don't have a soldering iron with a very small tip and some magnification so you can see what you're doing. You can destroy your mb and/or processor if you're not careful. That said, on to the mod....
I've sucessfully mod'd my P4T-E for increased vcore. The 3165 feedback pin is pin 9. This pin has a capacitor to ground and a direct connection to vcore. If the pin connected to vcore through a resistor (like in the schematic in the 3163 and 3164 datasheets) the mod would be simple, just connect a resistor of the correct value from pin 9 to ground. Since pin 9 connects directly to vcore a trace must be carefully cut. The pin 9 connection to vcore comes from a feedthrough and short pc trace to the capacitor and then to pin 9. Carefully cut the trace between the feedthrough and capacitor (don't cut too deeply into the board, the trace cuts easily). Now you'll need to install a couple of resistors to drop the voltage from vcore to pin 9. The easiest place to install these is by the cpu socket (just be carefull that nothing sticks up so high that it shorts to your cpu heatsink). There's a couple of spots where bypass capacitors could be installed but aren't, these make great vcore and ground connect points. (You'll need a larger soldering iron tip for these connections than what you should use to solder to pin 9). Call the resistor that connects to vcore R1 and the one that connects to ground R2. These should be connected together so you get R1 to vcore on one end, R1 connecting to R2 and then the other end of R2 connected to ground. Use a piece of small gauge insulated wire (solid rather than stranded preferred) to connect pin 9 to the R1/R2 connect point. It's best to keep the wire down on the pcb to minimize noise pickup. Solder the wire directly to pin 9, but carefull not to short 9 to pins 8 or 10.
The voltage will increase by a factor (1+R1/R2). I used 100 ohms for R1 and 1800 ohms for R2. This gave me a voltage increase of 5.6%, which was all the extra I needed to be able to run my 2.2 NW stable at 133mhz fsb. Note that the ADP3165 has over and under voltage protection set at +/-20%. If you don't do the VID pins wire trick, your max voltage will be 1.5x1.2=1.80v if you use jumper mode, or 1.65x1.2=1.98v if you use jumper free mode. If you wire VID5 and VID4 pins together on the processor you can get 1.70x1.2=2.04v max before overvoltage protection kicks in. Note that the exact values of R1 and R2 aren't important, just their ratio. If you use a potentiometer for R2 so the voltage can be easily varied, I'd suggest putting a fixed resistor in series with it to set a lower limit for R2. You could also use a pot for R1 instead, just be carefull of the noise pickup on the R1 wiring, which is more important than R2 wiring. A 200 ohm pot for R1 and 1800 ohm resistor for R2 would give a voltage increase of 0% to 11%.
Final disclaimer, I'm not responible if you screw up your motherboard or processor. Be careful!