Note: This only works if you have SLG8SP513v pll clock generator. If you have ICS9LPRS365. According to the acer aspire one service manual, these 2 clock generators are used. Acer might have also added some pll clock generator to the list, so it might not work for newer acer aspire one.
Undervolt Intel Atom processor -Download CrystalCPUID -Lock multiplier by either disabiling speedstep or enable speedstep to restricted the processor to 6x multipler (1.6ghz). -Lower or increase the processor voltage