Hey,
I don't know where I got this from or who made this picture, but here's the confirmed working OCP modification for the reference GTX260 cards.
Solder a 50k ohm resistor between both red points. Default would be 37k, but you'll need at least 25k ohm to go beyond 1.25v. Possibly even lower for 1.3v. At home I could boot easily at 1.65v on air cooling.
Always remember: OCP is not only triggered by voltage, but also by frequency. So, if you run 1.35v at stock clocks it might not be triggered but 1.3v and 1GHz clock might trigger it. Spending time figuring out the scaling of voltage/clocks/ocp is not a bad choice ;-)
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