I wouldn't run anything more than 1.4 on a 45nm AMD hexa for 24/7, though I have found with a 1090t to be easily good enough to get 4ghz. With a 1055 I would try 1.38 at 3.8 ghz and I'll bet you should be good to go. If it bsods on the load test you are using, bump the volt. If it gets too hot, lower the volt and decrease speed a little bit.
Welcome to the world of tweaking.
What kind of cooling are you using?
Liquid cooling. Cost about $100 got it from NCIX. Its some CoolIt system thing lol