I have done some tests with 2 NVIDIA cards (not in SLI) and 4 monitors, with nouveau drivers.
Debian 8 testing and Arch are not able to use the 4 monitors at the same time, but somehow Fedora 21 is able.
So I thought I'd try the config that Fedora is using with Arch and see if my monitors start working, but for that I must get the config that X is using in Fedora.
How can I get the config? (I tried
X :1 -configure and then reading the file that is generated in
/root/xorg.conf.new, but that doesn't seem to make my 4 monitors work)