According to XDA, Hotplugx has more optimized code to turn on/off the 2nd core faster than hotplug.
I'm running 1380 OC, speedscript V4, Hotplugx, and Noop. Sometimes Pegasusq governor works well too.
Best way to conserve battery is turn off updates and network when not needed.
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D2G and D4. Digitizer bit the dust on the D2G and I needed to get up fast so upgraded to the D4.
D4, Love it.