PP - every chips different dude....although you may have the same chip as in 2600+ XP Barton, every wafer will still be different....if it takes 1.9v for his to run that, then theres really nothing he can do about it.
Have you prime95'd it yet?
12+hours and you can call it stable
Got my venice running 2.2GHz right now from 2GHz....damn OC bug got me
even though the boards finicky, man I just got so anxious and had to start OC'ing it....running prime95 right now as I type this but I got a little bit different method.
When I'm OC'ing and know I want to go further, I run prime95 for 5 minutes....if it passes that 5 minutes then I got and bump the FSB another 5MHz....come back and do the same thing...when it gets to the point of it not passing prime95 within those 5 minutes or causing my computer to freeze, I know I need to add more voltage, then try the process again.
Then once you get to a clock speed you're fine with...then you start fine tuning the voltage by seeing if it'll run prime95 for 12+ hours.