at first glance I would say your voltage is not too high
PROVIDED your temps and cpu stress temps are good ??????
and your are using an aftermarket cpu cooler like the zalman 9700 instead of the intel OEM heatsink ?????
you could in theory go all the way to 1.50 (but I dont advise you try that)
I would realistically say 1.40 with stress testing passing ??????
I would say run
Orthos for atleast two hours to see if the system can stay stable ????
http://www.techpowerup.com/downloads/385/
while you are running orthos run this program too at the same time and watch your temps ......... if your temps go above 55C I would re-think your settings
http://www.alcpu.com/CoreTemp/