Yes as mentioned above. Just under clock and remember to under volt as well.
Alternatively without root and stock, just use power saving mode
White Samsung Galaxy S4 LTE i9505 + white S view Cover for everyday, Protective Cover+ for hiking, camping etc...
Rom: Stock non-rooted 4.4.2
SD card: 32 GB Class 10
Tablet: White iPad Mini + Green Smart cover
Firmware: iOS 7.1.1
Samsung Galaxy Tab 2 7.0 (Family tab)
ROM Stock 4.1.2