ive never overclocked anything before but i would suggest just keep raising the clock while makin sure you dont push the temp too high, stay well below 60c
Go figure, someone who has never overclocked before had to post on your thread to give you advice about how to overclock. Amazing.
The max temp for your cpu is 62c. As long as you stay under that your fine. Most people don't get over 4-4.2, so be happy.
It must be cold where you live to have such low temps, remember it'll be a lot higher in the summer. Especially with voltage at 4.5, lol, that could cause a catastrophic meltdown of your computer. Yeah obviously it was a typo.