Two different models of Nexus 5, LG-D820_S and LG-D820_C,

Okay so if 1920x1080 is a 16:9 aspect ratio and 1728x1080 is 16:10... what is 1794x1080?
 
Nevermind, according to Droid Life the benchmark app just didn't have access to the whole screen because of the nav bar, which is apparently 126 pixels tall. Fullscreen apps would still show 1920x1080.