dun straightaway bump it up to 2.7ghz and test it.....should do it slowly to determine the max possible speed with stock vcore....try increasing 10mhz at a time...

haha.....i dun think 6 hours is enough....last time when i prime my system....prime went pass the 8th hour...but by the time it reach the 9th hour, the thing returns an error...speaking bout priming for at least 6 hours...