it will depend on whether you can get there on stock volts or not... as soon as you start bumping volts you will start increasing heat dramatically.
on stock you might be lucky and only increase heat by 3-5'c but add 0.1v and that will jump by 5-10'c
and just because some 1 says you can do it, doesnt mean you should... after all its not there hardware your overclocking...