You know that if you want to use G-sync you need to go to nvidia control panel and set Vsync Mode to Gsync, then you need to turn on Vsync on the game on, ten Gsync will work.
Only issue i see is the noctua fans, 3000rpm ones are like jet engine, even if you undervolt them to min RPM they sound bad to my ears, otherwise you chose awesome parts, have fun with your PC.
This could be your issue: http://www.anandtech.com/show/8617/samsung-releases-firmware-update-to-fix-the-ssd-840-evo-read-performance-bug
(Least it fixed issues for me )