Screen(s) found, but none have a usable configuration.

I believe you want to add
to your /boot/loader.conf.
Also it would be good to know your graphics card, maybe it's not supported yet.
Just wondered how you concluded it was a Broadwell chip...

If anyone is in the same boat, see

Not sure if there is an update since that thread is over a year old.

Processor Performance and number of core like i3 7100 comes with 2 core and 4 threads and core i5 7600k comes with 4 core and 4 threads. and newer version of intel i3 and i5 processors comes with more numbers of core and threads. the both processors comes with different performance marks. if you are using i5 the work fast as i3 processors that is the main different.