Vsync problem in fallout 4

[mhmd199]

So I've been playing the game for more than a 100 hours and i liked it, but I experienced a really annoying problem. I'm getting a solid 60 fps when I'm outdoors but, when I'm indoors I often get an fps hit when looking in a particular direction (I noticed that this is associated with lighting).. My fps decreases rapidly from 60 to 40 then gets capped at 29.9 (and GPU usage goes down to 55% and cpu usage to 15%) then it goes up rapidly back to 60 fps when i look in another direction. This terrible fps variation is so annoying.

This issue is most noticeable inside the institute ... at first i thought this problem is caused by the AMD driver but when I searched I found someone with a GTX 980 having the same issue. I tried lowering the graphics to the lowest settings but that didn't solve the issue. I disabled the in game vsync (while keeping the 60 fps cap) and boom! the problem disappeared and my fps remains above 57 ALL THE TIME ! but the screen tearing makes the game unplayable. I tried forcing vsync & triple buffering in radeon settings, RadeonPro and D3Doverrider... all the 3 give the same result : the screen tearing is reduced but it's still there and it's very annoying. Also I tried dynamic vsync in radeonpro and it gives the same result. I installed the interior fog removing mod without any benefit.

I remember having a similar issue with AC black flag and I solved it using D3Doverrider's triple buffering and vsync. The vsync in fallout 4 is the most obnoxious vsync i've ever seen

Anyone having the same issue ? Is there any way to solve this problem (other than buying a freesync monitor) ?

My specs : i5 6600k/ Asus R9 390/ 8 gb RAM /Windows 10 64 bit

[Monarch]

Vsync is a terrible solution to screen tearing. That's why there are Freesync and Gsync. It's impossible to get all the frames done in 16.7 ms. Some will need more time even with an OCed 5960X in certain games. 

Now, there is something wrong with Fallout 4 and Vsync. I think it has to do with the fact that Fallout 4 is very CPU intensive, frametime varies a lot and often goes beyond 16.7 ms and messes up vsync. I don't think you can do anything other than getting a monitor that can actually refresh each time a new frame is available.

[mhmd199]

Thank you for responding. Yes the vsync in FO4 is the worst vsync I've ever seen, I just don't know why forcing triple buffering and vsync from a 3rd party program didn't work as it did with AC black flag.

Well I guess it's time for me to save money for a freesync monitor ..