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-   -   RTX 1080p 2080 question (https://forum.overclock3d.net/showthread.php?t=92721)

p1987 24-07-19 04:15 PM

RTX 1080p 2080 question

How do you think that Nvidia will correct the 1080p 2080 Ray Tracing issue ?

My understanding is that Ray Tracing needs to be pushed at higher resolutions for it to work correctly (dlss?).

Will they implement some kind of backing program to fake the gpu to be pushed at higher resolutions for 1080p or perhaps not have it for 1080p at all ?

My knowledge is very limited on this but I am keen to see what you all think ? :)

tgrech 24-07-19 04:54 PM

Is this an issue with DLSS or ray tracing as they are distinct(Though fairly complimentary) technologies? DLSS has a few limitations that make it undesirable for use with lower resolutions, chief among them is that it's primarily an upscailing technique and its key benefits are that it improves performance by reducing rendering load and then upscailing the image cheaply, but for low output resolutions this means either rendering at an initial resolution so low it would be a noticeable downgrade, or rendering at the same resolution as the output already meaning you're basically just adding an overly complex filter. Besides this, when your framerate goes high enough, the time taken to render a frame will drop below the fixed time taken for the Tensor cores to complete their calculations, so using DLSS above these framerates would begin to hinder frame latency while delivering no further benefits to framerate.

I guess they could allow you to use DLSS with super low input resolutions anyway and I think they allow that on lower cards sometimes, but it'd be 720p rendering for the usual 2:3 ratio if you used a 1080p output, which I'd guess doesn't look too great, and would likely result in a frametime far too low to be useful on a higher end card unless you cranked RTX and everything else to the max.

p1987 24-07-19 05:49 PM

Hi, thanks for the response. Her is a related link:


I think you are right that is can't render correctly on lower resolutions :)

Just wondered how they would do it for 1080p on a 2080?

I have the reg fix for 1080p 2080 and yes the screen rendering stays at 100% on BFV and does look blurry. I have counteracted that by increasing screen sharpening on my monitor lol

To get ray Tracing / dlss to work on a 2080 1080p, the solution is to find all reg entries for 'RTX 2080' and change them all to 'RTX 2070'; this doesn't affect gpu performance but allows Ray Tracing and dlss (works well on certain maps but not others :)

tgrech 24-07-19 05:56 PM

With more intensive games it'd be more likely that they'd train models for 1080p that could be used across higher end hardware, but at the moment I assume most games would hit framerates on an RTX2080 at 1080p that would make DLSS regularly switch itself off automatically due to being incapable of delivering further framerate benefits.

Essentially for the best results with DLSS you need to train several models for each game for different common resolutions, and even sometimes aspect ratios and major graphical settings changes, and the accuracy of these models(Which are very intensive and time consuming to make) becomes far more important at lower resolutions, and for an RTX2080 you might want to train a model separately for max settings including RTX in order to cover any realistic use case for someone being able too enable DLSS, rather than attempting to use the same model for 1080p from the 2060 up.

p1987 24-07-19 06:06 PM

Thanks :)

Even if you lowered gpu quality and changed other options for performance over quality I guess the frame would go up then, but not enough to utilize the full RT cores at 1080p?

I guess this is a development and graphical change for devs with good communication with Nvidia? Nothing we can do as a consumer ? :)

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