Unstable Overclock, can anyone recommend settings? [DX/D2 Overclock]

I had been using the 1.3 preset:

Max: 1300000

Slot 1: 400000
Slot 1v: 27
Slot 2: 700000
Slot 2v: 38
Slot 3: 100000
Slot 3v: 56
Slot 4: 1300000
Slot 4v: 68

Using this preset I basically had 4-5 reboots in a matter of 4 hours.

I liked the speed while it was functioning, but have since moved to the 1.2 preset (I'll spare the details), but what I'm wondering is that from reading a fair bit, I'm seeing higher voltages seem to equal greater stability, and so I'm wondering at 1.2 or 1.3, what are safe voltages to play around with that would fall in the category of "high voltage"?

I've been searching the forum here, and at XDA, for answers for a while now with no luck - so if this has been a common discussion and gets no responses I'll take the hint and try harder.

 

Well just a minor update, but it's been over an hour at the preset 1.2 with no reboot, so I'm guessing the 1.3 needs a bit of tweaking I'm simply not yet comfortable with.

If this stays stable, it might be good enough. The performance increase is still notable, though also not as much.

 

Can you recommend any increments to try?

Apologies, I'm quite new to the overclock world and have had a difficult time understanding what kind of parameters are safe in these kinds of things.

 

Mega, thank you. Will give this a shot this evening. Really appreciate it.

 

Well early signs are promising, my first reboot (which I thought was just a fluke) earlier was less than an hour in. Temp is remaining pretty consistent at approximately 86 degrees F, everything running very smoothly.

Hopefully the same can be said around this time tomorrow, but regardless of the result thanks again for trying to lend a hand, Dustin.

 

Well, a couple hours on and it's reboot a couple of times so I've reverted back to the 1.2 profile (the most stable thus far, no reboots), does this generally indicate there's still an increase needed?

Also, any idea as to why the issue diminishes at higher voltage?