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I Tested the new Temporal Super Resolution (TSR) upsampling method of Unreal Engine 5 Early Access using the Ancient Valley demo. Dis some comparisons to UE's original TAA upsampling and naiive upscaling as well. Results below:

Test System

All of the comparisons were run at 1440p on my home rig in UE5 editor with Epic quality assets (unfortunately I don't have a 4K monitor):

Radeon 6800
Ryzen 3700X
32GB of DDR4 @ 3600CL14

Video comparisons:

Youtube (blurrier but with chapters)

Vimeo (better quality, but no annotations)

At 0:52 I change from 50% (720p) TAA to TSR, night and day difference in not only quality but also temporal stability.

Image comparisons and Performance:

(only .jpg for now due to imgur conversion on upload. Will replace with .png's tonight)

Resolution: From -> to	Comparison link	Performance
720p ->1440p	TAA vs TSR	81 FPS vs 79 FPS
720p ->1440p	Native 1440p vs TSR	44 FPS vs 79 FPS
1080p ->1440p	TAA vs TSR	61 FPS vs 58 FPS
1080p ->1440p	Native 1440p vs TSR	44 FPS vs 58 FPS
2880p -> 1440p (downscale)	Native 1440p vs 2880p	44 FPS vs 14 FPS

Side-by-side collage (added in a downsampled 2880p version for good measure, to see if it makes any major difference to geometry due to how Nanite operates)
Full imgur gallery (with othe scenes as well)

How is this relevant is this relevant to this subreddit?

With DLSS and temporal upscaling being all the rage and Amd working on their own method (GSR), UE5 engine's implementation is actually very relevant as:

UE4 TAA is the de-facto standard for upscaling in last-gen games (at least on consoles). TSR looks to be the same for UE5 (on consoles)
TSR is a lightweight algorithm (no Tensor Cores required) with shaders specifically optimized for PS5's and XSX's GPU architecture (source). It's a very good baseline for what AMD's GSR can do
It has some properties required for good upscaling, that TAA absolutely doesn't have and GSR needs to have: Temporal stability, minimized ghosting - achieved by using more game data (e.g motion-vectors). Here's what Epic has to say about it:

* Output approaching the quality of native 4k renders at input resolutions as low as 1080p, allowing for both higher framerates and better rendering fidelity.* Less ghosting against high-frequency backgrounds.

* Reduced flickering on geometry with high complexity.

* Runs on any Shader Model 5 capable hardware: D3D11, D3D12, Vulkan, PS5, XSX. Metal coming soon.

* Shaders specifically optimized for PS5's and XSX's GPU architecture.

There is a lengthier post with console commands and more info on Anandtech forums

Verdict:

Overall TSR IMO looks really really good considering the circumstances. In actual gameplay (in motion) it fixes most of the problems I have with legacy upsampling methods like TAA (this is why I can't stand it in Cyberpunk below 90% for instance).

Upsides:

+ Very small performance hit
+ No exotic hardware requirements (works even with Vega)
+ Excellent temporal stability and no flickering on faraway objects with complex geometry
+ Looks considerably better than TAA, particularly on the edges of faraway objects. 720p TSR sometimes even beats 1080p TAA (definitely so in motion)

Negatives:

- Still bugs and artifacts on moving objects/characters
- Nanite can reduce geometry detail (up to 4x when doing 50% upscaling), since it strives to show about 1 polygon per pixel and doesn't account for upscaling. It's similar to the bugs DigitalFoundry has mentioned with LODs.

Unfortunately I don't have a 4K screen so can't try it out, but considering the relatively good job TSR did at 50% (720p) for 1440p going from 1080p to 4K (that will be the standard for console) should be very decent. This is somewhat confirmed by my 1080p -> 1440p results.

How does it relate to AMD's upcoming GSR?

Considering AMD was at least somewhat involved with UE5 development, TSR is also vendor agnostic and TSR's shaders are optimized for RDNA2 Consoles, it should at the very least be considered a distant cousin to the upcoming GSR and also the baseline on what to achieve.

That's not a bad thing as it performs and looks very well. Even if AMD can't improve upon TSR, GSR would still be a totally adequate upscaling method (well worth it for consoles at least). If they do manage to do even slightly better, then IMO it's a true and honest DLSS competitor.

How does it relate to DLSS? (e.g. help wanted)

Unfortunately I don't have an RTX card but anyone Who has one and some UE engine knowledge could help out (and perhaps do 4K comparison in the process). Nvidia has uploaded a version of their DLSS plugin to NvRTX github that should compile with UE5. So at least in theory it should be possible to also compare to that as well.

TL;DR:

Still some bugs, but overall TSR looks very very good on the stills and even better in motion, especially when considering the minimal performance hit and hardware compatiblity (Vega and Maxwell included) .

It provides a good baseline for what to expect from AMD's GSR (hopefully it can do even better) and it looks to be a very solid offering.

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