I have been using xscaler for about 6 months I set it to auto scale after 40% load and jump to 520, the only time I have lockups is when my program memory reaches low levels. I will be typing an email have a call come in than immediately make another call or start the internet, try this without overclocking, and if you don't lock up your 6700 it will run slow. With my 6700 autoscaled I continue to get prompt responses with no freezes. These benefits do have some cost, it can kill the battery depending on how much time the 6700 spends running at the 520 speed.
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“It is from numberless diverse acts of courage and belief that human history is shaped. Each time a man stands up for an ideal, or acts to improve the lot of others, or strikes out against injustice, he sends forth a tiny ripple of hope.”
Robert Kennedy
Ha y'all come visit me at WMExperts some time. 
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