Levente Nemeth

If it still locks up it may be running hot...you can slow down to 816MJz which will limit maximum voltage to processor lowering it's heat output...it does slow it down, but will run alot cooler.
 
I also changed mine from ondemand to conservative, but as tkaiser said...lower cpu on reads/writes makes things slow, especially if logging data. so kicking up minimum to 480 vs 240 is best.