DDR3L is just the same ram that uses less power than normal ram. Newer processors require less power to run and they also require the ram use less power or else it might lessen the life of the processor. Its not too much of a problem. One thing I did with my own computer when I bought a Skylake processor was use the old ram but tested it out a bit with the ram running lower volts. My old ram did just fine using lower volts so I didn't bother buying DDR3L.