For a more durable way to overvoltage the boards you should replace resistor R01F. The nominal value is 1.0K, and to increase the voltage the resistor needs to be replaced with one of a higher value.
A value of 1.5K is generally still safe, and should increase voltage from 0.65 to 0.7. If you want to go higher, you can try 2.2K or maybe even 3.3K if you feel lucky.
Of course, as punin said, this will void your warranty, and may break your card. Keep a close eye on the regulator temperature. Also, the resistor is in a somewhat tricky position to desolder, and you risk getting tin on the pins of the regulator.
The resistor should be 0603 size to fit properly on the pad. Also, I recommend a 1% type with low temperature coefficient. Resistors with high positive temperature coefficient may cause thermal runaway: as the resistor heats up, the voltage increases, causing the resistor to heat up even more.
Note: if you accidentally mess up the capacitor next to the resistor (C10F), and you wish to replace it, use 1nF, 50V, X7R type. Similarly, resistor R02F is 10k, 1%.
