Ok so, spec....
Pro: Intel i5-4440k @3.1GHz
Ram: 8gb 1600mhz. (Corsair value select...)
Mobo: MSI PC Mate H97
OS: Windows 10 Pro x64
GPU: Asus Radeon R9 390. core clock 1000MHz, mem clock 1500MHz, 8gb ddr5.
Monitor: BenQ XL2730z.
Not a clue myself where to go with this now so any input is appreciated. I've done a fresh install of windows, updated all the drivers. And still suffering from a clearly noticeable screen tear in more than one game. I may have exaggerated by saying every game, because I've only tried two. Rocket League and Battlefront. But both are screen tearing terribly even with freesync on.
I'm using the display port cable that comes with the monitor, and all the other features seem to be working fine. When I enter the display settings on the monitor it states it's current res is 2560x1440 @144, with freesync on. When I enter the radeon crimson settings it also states that freesync is on. Hovering the mouse pops up a bubble stating "refresh rate reported...40-80hz". This has went up from 40-60. Which happened after I increased the refresh rate in the custom resolution settings. However it has stayed at 40-80hz, despite myself resetting the settings to factory default. Not sure if that makes a difference.
Anyways during game whether freesync be on, or freesync be off. Very noticeable screen tearing. I was using the fps counter steam supplies when playing rocket. It was reaching 70fps max, which shouldn't really be fast enough to screen tear the display at all.
Like I says, don't know where to go from here tried so much lost for answers now so anything helps, cheers.