GTX 980Ti SLI - low Frame Rate on 4k Monitor vs 4k tv - Witcher 3 - 5960x - Windows 10

[m&m's]

I tried entering 60 instead of 0 but it didn't change anything.

But i have found something interesting: If i disable Vsync and wait a little, performance seems to increase suddenly after a few seconds. I get about 10 more FPS. GPU1 utilisation increased from around 87% to 98% and GPU2 utilisation stays the same at about 98%. The performance is then the same as with Chroma 4:2:0.
If i activate Vsync again performance is still good but if FPS drops too low, it then gets stuck at 40 FPS again, and i have to deactivate Vsync and wait again to get the good performance back.

I tried GTA V to see if there is a similar problem but GTA V worked perfectly in both chroma 4:2:0 and 4:4:4 modes (GPU utilisation was about 98% for both GPUs, with vsync off)

Disable the in game VSync and force it through the NVidia panel.

 

[Vayra86]

I signed up on this site because i'm having the same issue as Ryan with my 4k LG TV and my 980 Ti SLI.
When i play The Witcher 3 in 3840x2160@ 60hz with chroma set to 4:2:0 in my TV i get smooth 60 FPS with all settings at max (hairworks is activated too).
But when i set my TV to chroma 4:4:4 mode, with the same settings i get only 40 FPS.
If i try to disable antialisasing and hairworks i'm still getting 40 fps with chroma 4:4:4, it's really weird.
For 4k@60hz with chroma 4:2:0 i'm using a DVI to HDMI cable plugged to my TV.
For 4k@60Hz with chroma 4:4:4 i'm using an HDMI 4k certified cable plugged to my TV.


It looks like a several games have this 40 FPS limitation in 4k but not all (with GTA 5 i get 60 FPS with 4:4:4 chroma).

If it try to connect my TV with an HDMI cable to get chroma 4:2:0 at 4k@60hz i get a flickering bug and only 40 fps too.

Something just dawned on me.

This is all Maxwell, with its Delta color compression tech. Can anyone in this situation see if the behaviour is similar on Kepler, say a 780ti? I have one coming in next week, but no access to a 4K panel... I'm actually dying to test on that premise, I've always considered it a shady arch (reason I move up to 780ti instead of 970 )

 

[the54thvoid]

Silly input but is Nvidia control panel on adaptive vsync? It drops fps where they struggle to maintain 60fps.

As for above post, he's stated GTAV works fine at 4:4:4 at 4k. Sounds like an issue with frame syncing, possibility driver based or fault of game itself.

 

[Ferrum Master]

Silly input but is Nvidia control panel on adaptive vsync? It drops fps where they struggle to maintain 60fps.

As for above post, he's stated GTAV works fine at 4:4:4 at 4k. Sounds like an issue with frame syncing, possibility driver based or fault of game itself.

It could be the GTA4 actually is more consolish... the textures already are very compressed. So it goes through... Witcher 3 texture data is way more vivid and harder to compress... look at Tris's or Yen's boobs... they are not compressible (top this solid argument lol)

 

[Kaendd]

I tried disabling vsync in game and enabled it on nvidia control panel. I tried all different vsync methods but none of them gave satisfying results. One of them removed the 40 FPS cap but the tearing was still present. I think i'll just live with it for now. I'll create a custom resolution as close as possible to 4k to let me play it at 60FPS, i'll loose the 1:1 pixel mapping but smooth 60 FPS gameplay is more important.

 

[the54thvoid]

Witcher 3 texture data is way more vivid and harder to compress... look at Tris's or Yen's boobs... they are not compressible (top this solid argument lol)

They saved on texture data by not giving Geralt a penis.

 

[Ferrum Master]

They saved on texture data by not giving Geralt a penis.

Imagine also the physx load, a dedicated core needed to calculate swinging on each sword strike.... simply our PC's would't handle it...

 

[the54thvoid]

Imagine also the physx load, a dedicated core needed to calculate swinging on each sword strike.... simply our PC's would't handle it...

I don't want to be pedantic but I think it's called 'PeniX', not physx.