RAM Voltage

i've seen discussion mbp memory upgrades 16mb, when looked today, seen 2 different voltage ratings chip set. crucial kit lists low voltage of 1.35v, while else (corsair, g.skill...) 1.5 volts (and considerably cheaper). question is, if battery live primary concern, low voltage ram battery in mbp last longer? reason "official mac" memory expensive?
thanks, looking forward upgrade, wanna make sure buy right set.
geoff

 

the slight 1.5v difference won't make difference in battery life.

system can use either. not sure there difference. bought 1.35 use less power, less power less heat.

 

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