https://www.userbenchmark.com/UserRun/15087301 my system is a lot weaker than yours on the gpu side.
but i can play apex fine...
looking at the settings though...
if i max out the textures my fps crumples. so im guessing your having a similar issue.
try dropping the textures to high or medium (you wont notice any difference visually unless your playing at 1440p+)
and you should clawback about 1/3 of your fps.
if that doesnt work check your drivers and make sure you have them installed and they work (check device manager in control panel)
and make sure you have your gpu connected to the monitor and not the motherboard output connected to the monitor.
lastly check the nvidia control panel is reset to default. and disable any optomizations your using via GFE.