Just to add another sample, I have a Phenom II X4 940 (not OCed right now) and the most taxing one I found was http://www.mattryall.net/demo/atlassian-vis/activ

Just to add another sample, I have a Phenom II X4 940 (not OCed right now) and the most taxing one I found was http://www.mattryall.net/demo/atlassian-vis/activity/ http://www.mattryall.net/demo/atlassian-vis/activity/, which put one core around 70% on average while not touching the others.