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  5. Unreal Engine 4.25 – NVIDIA GeForce RTX 3080 Performance

Unreal Engine 4.25 – NVIDIA GeForce RTX 3080 Performance

Posted on September 17, 2020 by Kelly Shipman
With the release of the RTX 3090 and RTX 3070, we have an updated article that includes results for the RTX 3070, RTX 3080, and RTX 3090: Unreal Engine 4.25 - NVIDIA GeForce RTX 3080 Performance

Table of Contents

  • Introduction
  • Test Setup
  • Overall Unreal Engine Performance Analysis
  • Virtual Studio
  • Megascans Abandoned Apartment
  • Megascans Goddess Temple
  • ArchViz Interior
  • How well does the NVIDIA GeForce RTX 3080 perform in Unreal Engine?

TL;DR: NVIDIA GeForce RTX 3080 performance in Unreal Engine

In virtually every test we performed, the RTX 3080 outperformed both the 2080 Ti and Titan RTX by a wide margin while costing significantly less. At 4k resolutions, we see an average 60% improvement in FPS over the 2080 Ti, with some tests being nearly double the frame rate. In the worst cases, the RTX 3080 was neck and neck with the Titan, only loosing out when VRAM was a limiting factor.

Introduction

On September 1st, NVIDIA announced the new GeForce RTX 30 Series, touting major advancements in performance and efficiency. While gaming was a focus of the launch, applications like Unreal Engine have moved on from being “just a game engine” to become an important tool across multiple industries. As such, we’ll take a look at the performance of scenes tailored to Architecture, Cinematic Rendering, and Virtual Production.

Unreal Engine Performance Benchmark - NVIDIA GeForce RTX 3080 10GB and NVIDIA GeForce RTX 3090 24GB
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Unreal Engine Performance Benchmark - NVIDIA GeForce RTX 3080 10GB and NVIDIA GeForce RTX 3090 24GB
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If you want to see the full specs for the new GeForce RTX 3070, 3080, and 3090 cards, we recommend checking out NVIDIAs page for the new 30 series cards. But at a glance, here are what we consider to be the most important specs:

VRAM CUDA Cores Boost Clock Power MSRP
RTX 2070S 8GB 2,560 1.77 GHz 215W $499
RTX 3070 8GB 5,888 1.70 GHz 220W $499
RTX 2080 Ti 11GB 4,352 1.55 GHz 250W $1,199
RTX 3080 10GB 8,704 1.71 GHz 320W $699
Titan RTX 24GB 4,608 1.77 GHz 280W $2,499
RTX 3090 24GB 10,496 1.73 GHz 350W $1,499

While it is a bit odd that the RTX 3080 has less VRAM than the 2080 Ti, all these new cards should provide a significant performance boost in Unreal Engine. The RTX 3080 and 3090 (with 10GB and 24GB of VRAM respectively) should also have no trouble with 4K even with advanced ray tracing options enabled.

Since only the RTX 3080 is fully launched at this point (the 3090 is set to launch on Sept 24th, and the 3070 sometime in October), we unfortunately will only be able to examine the 3080 at this time. However, we are very interested in how the RTX 3070 and 3090 will perform, and when we are able to test those cards we will post follow-up articles with the results.

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Test Setup

Listed below is the specifications of the system we will be using for our testing:

Test Platform
CPU AMD TR 3970X 32 Core
CPU Cooler Noctua NH-U14S TR4-SP3
Motherboard Gigabyte TRX40 AORUS PRO WIFI
RAM 4x DDR4-2933 16GB (64GB total)
Video Card Gigabyte GeForce RTX 3080 OC 10GB
NVIDIA Titan RTX 24GB
NVIDIA GeForce RTX 2080 Ti 11GB
NVIDIA GeForce RTX 2080 SUPER 8GB
NVIDIA GeForce RTX 2070 SUPER 8GB
NVIDIA GeForce RTX 2060 SUPER 8GB
Hard Drive Samsung 960 Pro 1TB
Software Windows 10 Pro 64-bit (Ver. 2004)
Unreal Engine (Ver. 4.25.3)

*All the latest drivers, OS updates, BIOS, and firmware applied as of September 7th, 2020

Big thank you to Gigabyte for providing the GeForce RTX™ 3080 GAMING OC 10G used in our testing!

To test each GPU, we will be using the “typical system used at Epic”, specifically the AMD Threadripper 3970X. Due to its speed at compiling shaders, building lighting, etc, Threadripper has become the go-to for Unreal development.


For the testing itself, we will be using four sample scenes from the marketplace with some modifications to make testing easier. These sample scenes are a much better representation of what someone in Virtual Production or Architecture may work with than a video game. Eventually we would like to have custom maps for these tests, however due to time constraints for this launch, these will work just fine. I’ll detail each scene and any modifications below.

Overall Unreal Engine Performance Analysis

With Unreal Engine, GPU performance is one of the key metrics regardless of industry. The draw to game engines is their real time nature. The game industry often is concerned with how many frames per second they can maintain, while filmmakers want to know how many effects, and large textures they can throw at a scene while maintaining their target 24 or 30 frames per second. These are two different sides to the same coin. Many of the examples below have a frame rate that would be unacceptable to gamers, but the key takeaway is how much of an improvement the new card does, or does not, provide.

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These graphs average the FPS for a specific resolution across the various scenes, and then normalize them to the 2080 Ti. To get the average FPS for a scene, a camera sequence was scripted to give a range of lighting scenarios and polygon counts. The sequence would then auto start when selecting "Play in Editor" at the desired resolutions. From here the script counts how many frames were rendered during the duration of the test, giving us the average FPS. We’ll go into more detail of each specific test later. This gives us a broad look and what kind of performance increase to expect.

As you can see, the new Nvidia RTX 3080 shows significant improvements across the board, especially at higher resolutions. Not only is it faster than either the 2080 Ti or Titan RTX, but it costs much less. Unreal Engine will use every bit of power you give it, so this kind of performance improvement is in line with what we expected.

Virtual Studio

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The first scene we will look at is “Virtual Studio” created by Epic. Virtual Production in News and Sports broadcast has exploded recently. This represents a fairly typical broadcast setup, with a virtual set, video wall, and hooks for a live camera feed. For this test, I did not connect a live camera as that has the potential to introduce issues outside of the scope of what we are testing. By default this scene does not use Ray Tracing, however I ran the tests both with and without so we could see how well the cards perform in both situations.

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Since this is a pretty basic scene, when playing at 1080p with ray tracing disabled, we are being bottlenecked by the CPU. Once we add in ray tracing, and increase the resolution, we see the 3080 take a commanding lead. At a 4k resolution, with ray tracing enabled, we see a near 50% increase in FPS over the Titan. Keep in mind that the Titan has an MSRP more than three times that of the 3080.

Megascans Abandoned Apartment

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The next scene is the Abandoned Apartment from Quixel. Epic acquired Quixel last year and brought their library of photogrammetry based materials to Unreal. This scene uses numerous 8k and 4k textures as well as some high poly count models, and is an example of what someone in Virtual Production or Cinematic Rendering may use. It wouldn’t be a stretch to extrapolate these results to an Architecture Visualization workflow, as they’d be using similar texture sizes, they just tend to want the apartment to look new and less abandoned.

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For this, I only rendered with ray tracing enabled as that is the big draw to Unreal for the above use cases. Again, the 3080 takes a commanding lead with almost double the frame rate at 4K over the Titan and 2080 Ti.

In addition to the FPS test, I rendered out a 4K cinematic to see how these cards perform when not trying to be “real time.” As you can see, the results are interesting.

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It appears that the render time, for this 43 second video clip, plateaued at 3:40. I suspect there is a platform limitation happening and I’ll dig more into it when I do CPU testing. A quick look at Task Manager during this test shows only a single CPU thread active, so there may be something to this.

Megascans Goddess Temple

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We have another scene from Quixel, their Goddess Temple. Much like Abandoned Apartment, this scene features numerous large textures. One major difference is this scene has a lot of overlapping shadow casting lights and particle effects, which provide their own unique challenges.

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As you can see, the 3080’s lead has narrowed considerably. That said, it is still edging out a video card that costs three times as much. Given that the 2060, 2070, and 2080 all have similar scores, and that the 3080 has slightly less VRAM than the 2080 Ti, I suspect that the performance is being limited by VRAM. We’ll know for sure when we are able to test the new 3090.

Once again, cinematic rendering times seem to be hitting some limitation other than raw GPU performance. We’ll have to see what the 3090 can do, and then test how the CPU plays into rendering cinematics.

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ArchViz Interior

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Our last scene is the ArchViz Interior from Epic. The goal with Architecture Visualization is to have photorealistic materials and lighting. Once again, there are a lot of high resolution textures in use, reflective surfaces, and higher than normal Global Illumination rays. This scene is very demanding even for the most high end video cards. I ran this both with and without ray tracing.

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The 3080 once again leads in every single test with one exception. When running this scene in 4k with ray tracing enabled would take over 16GB of VRAM, causing all cards to crash except for the Titan with its 24GB of VRAM. Once we can test the 3090, we’ll be able to see what this new generation can do.

How well does the NVIDIA GeForce RTX 3080 perform in Unreal Engine?

In virtually every test we performed, the RTX 3080 outperformed not only the 2080 Super that is is directly replacing, but also the 2080 Ti and Titan RTX by a wide margin while costing significantly less. At 4k resolutions, we see an average 60% improvement in FPS over the 2080 Ti, with some tests being nearly double the frame rate. In the worst cases, the RTX 3080 was neck and neck with the Titan, only loosing out when VRAM was a limiting factor.

For users that don’t have a specific need for Quadro, either due to other software requirements or to use a Sync card, the RTX 3080 is a monster in Unreal Engine and has easily taken the crown as the best option. At least until the 3090 arrives in a couple weeks.

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Tags: Hardware Acceleration, NVIDIA, RTX 2060 SUPER, RTX 2070 SUPER, RTX 2080 SUPER, RTX 2080 Ti, RTX 3080, Titan RTX, Unreal Engine

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