cpu-z says that my 4gb is using 1.5 voltFrom what I've been able to find, you need to use DDR3 Low Voltage (DDR3L) RAM. So ordinary DDR3-1600 would not work. Again from what I can tell your system has two DDR3L RAM slots with a max allowed 16GB of RAM so you could install DDR3L-1600 8GB RAM modules.
-Wolf sends
Yup that's the same modelWhen reality disagrees with posted specs, I really have no argument. If THIS RAM is what you're currently running, then I don't see any reason why any other 1.5V DDR3-1600 DIMM module wouldn't work.
-Wolf sends