FreeBSD can't run X with my GTX 960

[Adrien2002]

Hello FreeBSD users,
I installed

FreeBSD stable 10.3
xorg 7.7.2
nvidia-driver 346.96

linux_enable="YES"
--> /etc/rc.conf

nvidia_load="YES"
--> /boot/loader.conf

Section "Device"
Identifier "GTX960"
Driver "nvidia"
Option "NoLogo" "true"
EndSection
--> /etc/X11/xorg.conf

The xorg.conf is the same as on my laptop running a GTX 765m with FreeBSD 10.3 and it perfectly works
I watched about the appendix to check if my GTX 960 is compatible with nvidia-driver 346.96 and yes, it is.

startx (or xinit) returns me
(EE) No screens found

The Xorg.log says
(EE) No devices detected (EE) No screens found

Why can't I use my GTX 960 on FreeBSD ?