According to Techspot, Samsung will adopt FreeSync in all their 4k monitors, it was about time, i say
http://www.techspot.com/news/58899-all-samsung-ultra-hd-monitors-2015-support-freesync.html
http://www.techspot.com/news/58899-all-samsung-ultra-hd-monitors-2015-support-freesync.html