Question what is the difference between PC3L 12800 and PC3 12800

[ZeusTheCat]

I have the iMac 27-inch Late 2013 and I am looking to put some more ram. It supports PC3 12800 and the ram I found (bit.ly/ramforimac) is PC3L 12800. Will it work?

 

[kanewolf]

The "L" is low voltage 1.35V rather than 1.5V -- https://en.wikipedia.org/wiki/DDR3_SDRAM#DDR3L_and_DDR3U_extensions . Mixing the two will usually not work.