New low latency nvidia drivers

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crossjeremiah
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New low latency nvidia drivers

Post by crossjeremiah » 20 Aug 2019, 10:16


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Re: New low latency nvidia drivers

Post by Chief Blur Buster » 20 Aug 2019, 14:21

It might make Scanline Sync a little less needed.

RTSS can still help out with some framepacing though -- more tests are needed.
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crossjeremiah
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Re: New low latency nvidia drivers

Post by crossjeremiah » 20 Aug 2019, 17:07

I combined rtss and nvidia low latency ultra mode on vulkan. And in presentmon it showed 0.05ms . That's the lowest I've ever seen and it stays constant.

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Re: New low latency nvidia drivers

Post by Chief Blur Buster » 20 Aug 2019, 17:39

crossjeremiah wrote:I combined rtss and nvidia low latency ultra mode on vulkan. And in presentmon it showed 0.05ms . That's the lowest I've ever seen and it stays constant.
Pretty neat if they combine, then.

Technically VSYNC OFF Present() is similar latency to that.

My understanding is that NVIDIA Low Latency Ultra VSYNC ON is roughly equivalent to RTSS Scanline Sync VSYNC OFF. It isn't quite a 100% apples-vs-apples, but both modes would have no tearing if configured properly.

Are you using VSYNC ON or VSYNC OFF with NVIDIA Low Latency Ultra?
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whitepuzzle
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Re: New low latency nvidia drivers

Post by whitepuzzle » 20 Aug 2019, 17:43

Is there any utility whatsoever to these low input lag modes when running 200+ fps VSYNC OFF on 144hz monitor?

Vleeswolf
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Re: New low latency nvidia drivers

Post by Vleeswolf » 21 Aug 2019, 01:31

crossjeremiah wrote:I combined rtss and nvidia low latency ultra mode on vulkan. And in presentmon it showed 0.05ms . That's the lowest I've ever seen and it stays constant.
The new ultra low latency mode is only for DirectX 9 and 11, according to Nvidia’s description.

crossjeremiah
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Re: New low latency nvidia drivers

Post by crossjeremiah » 21 Aug 2019, 09:34

*deleted*
Last edited by crossjeremiah on 21 Aug 2019, 16:59, edited 2 times in total.

alapsu
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Re: New low latency nvidia drivers

Post by alapsu » 21 Aug 2019, 11:15

crossjeremiah wrote: On VULKAN (let me know if Low latency mode doesnt work on Vulkan)
I tried Vsync off + Scanline sync + Cap = 0.05-0.06MS (depending room temperature) lowest I've got was 0.04-0.05MS (Tried Ultra and On, same results)
No RTSS - 0.60MS (ULTRA & ON)

Do you think if I had beefier card I could lower latency or would it stay the same.
Hey,

Looks like low latency doesn't work on Vulkan. See https://www.nvidia.com/en-us/geforce/ne ... dy-driver/

From that link:

"Our new Low Latency Mode is being released in beta with support for all GPUs in DX9 and DX11 games (in DX12 and Vulkan titles, the game decides when to queue the frame)."

crossjeremiah
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Re: New low latency nvidia drivers

Post by crossjeremiah » 21 Aug 2019, 11:21

*deleted*
Last edited by crossjeremiah on 21 Aug 2019, 16:59, edited 1 time in total.

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Re: New low latency nvidia drivers

Post by Chief Blur Buster » 21 Aug 2019, 16:15

crossjeremiah wrote:A decent value (-10) no input lag benefits from RTSS (Perfect Glass no saw tooths)
60FPS / Cap / No Scanline Sync / Vsync On / LL - Ultra - 4-5MS
60FPS / Cap / Scanline Sync / Vsync On / LL - Ultra - 8.38MS
Did you properly calibrate Scanline Sync before turning VSYNC ON? This can be important.

The time-phase of raster scan line relative to the time-phase of VBlank interval (VSYNC signal), will create a latency change with an error margin of 1 refresh cycle. So pre-calibrate Scanline Sync with VSYNC OFF to move tearline permanently jittering ABOVE the bottom edge of the screen (never going below bottom edge), *before* you turn VSYNC ON.

See Scanline Sync HOWTO
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