Yeah, but would you run a 65nm above 1.5v 24/7.
For 45nm the abslute limit in my opinion is 1.365v. Sure you may be able to go higher but its a risk not worth taking IMO. Many people have run into problems of electromigration and degredation. However, above 1.365v is fine for a benchmark run but I wouldn't risk it for 24/7 usage.