From what i've researched iMac's can handle both 1.35 V & 1.5 V RAM. I'd like to know if either voltages is a better option for the Haswell iMac's. Could adding 1.5 V potentially harm the computer or is 1.35 V more of a power saving measure? My hunch is the 1.5 V in an iMac would be fine and 1.35 V would optimise a MBP. I had ordered Kingston HyperX Plug & Play 1.5V http://www.amazon.co.uk/gp/product/B008H7IGGI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1 due to it's low latency but know of a more expensive 1.35 V version. I'm wondering whether it's worth getting a lower voltage module set to optimise my computers lifespan. Any advice or opinion would be really helpful.