What is ray tracing? An honest look at the FPS cost
Ray tracing is a way of drawing light by simulating how real rays bounce — giving you accurate reflections, shadows, and lighting instead of the clever fakes games normally use. It looks great, and it's expensive: turning it on costs roughly 35% of your frame rate on average, and the heaviest "path tracing" mode can cost 80% or more. The honest answer to "is it worth it" is: in some games, absolutely; in many, not really.
Let's unpack what it actually does, what it costs, and how to enjoy it without dropping into slideshow territory — with real benchmark numbers, not vibes.
What is ray tracing?
Ray tracing simulates the physical behavior of light. The engine traces the path of light rays as they leave a source, bounce off surfaces, and reach your eye, which is how it produces realistic reflections, soft accurate shadows, and global illumination — light bouncing off one surface and subtly colouring another. It's the same principle Hollywood has used for CGI for decades; doing it in real time, 60+ times a second, is the hard part.
Almost no game ray-traces everything. The standard approach is hybrid: the engine draws most of the scene the fast old way and adds ray-traced reflections or shadows on top. That hybrid design is exactly why the performance cost varies so much from game to game.
Ray tracing vs rasterization: what's the real difference?
Everything before ray tracing used rasterization — a fast, decades-refined set of tricks that approximate light. Reflections are often a flat copy of the scene pasted onto a surface; shadows are pre-baked or low-resolution; a mirror might show nothing at all. It looks good and runs fast because it's faking the result rather than computing it.
Ray tracing computes the real thing. A puddle reflects the actual neon sign above it, including objects off-screen; a character's shadow softens correctly as it stretches away. The catch is that simulating light is enormously more work than faking it, and that work lands entirely on your GPU. That's the trade in one sentence: more realistic light, far fewer frames.
How much FPS does ray tracing cost?
More than most settings, and it scales with how much of the lighting is ray-traced. TechSpot benchmarked 36 games on an RTX 4090 and found an average frame-rate hit of about 35%, with 21 of 24 configurations losing at least 20% (TechSpot). Roughly, the cost stacks up in tiers:
Cyberpunk 2077 is the textbook example: on an RTX 4090, standard Ultra ray tracing costs around a fifth of your frame rate, but switching to the Overdrive path-tracing preset costs roughly 80% (TechSpot). The cost is also heaviest at high resolution, for the same reason 4K is hard in general — it's pure GPU load, which our resolution guide breaks down.
What is path tracing, and why does it melt GPUs?
Path tracing — branded "RT Overdrive" in Cyberpunk and "full ray tracing" elsewhere — drops the hybrid approach and simulates nearly all the light in a scene at once. It's the closest thing to true-to-life rendering in games, and it's brutal: at native 4K it pushes even an RTX 4090 into the low 20s for frame rate. Tom's Hardware went as far as calling full path tracing "fully unnecessary" for the performance it demands (Tom's Hardware). It's a stunning showcase and a glimpse of the future — but today it's only playable with heavy upscaling and frame generation doing the lifting.
Is ray tracing worth it?
Here's where we won't pretend it's a clean yes. The honest answer is that it depends on the game and on what you play for. In TechSpot's visual analysis, ray tracing genuinely transformed a handful of titles — Alan Wake II, Cyberpunk 2077, Metro Exodus Enhanced, Control — while in many others it was barely noticeable, and in a few it actually looked worse than the rasterized version (TechSpot).
- Turn it on in games built around it, on a single-player playthrough, if you have a strong RTX or RX 7000-series card and frames to spare.
- Leave it off for competitive shooters — frame rate and responsiveness win games, and the eye candy is wasted in a firefight.
- Test it per game. Toggle it, look at a reflective surface and a shadowed area, then decide if the visual gain is worth the frames you just gave up. Sometimes it isn't.
How to use ray tracing without tanking your frame rate
This is what makes ray tracing practical in 2026: you pair it with upscaling (DLSS, FSR, or XeSS) to win back real frames, and optionally frame generation to smooth the displayed result. Upscaling renders at a lower internal resolution and reconstructs the image, recovering much of what ray tracing took — which is why the two technologies grew up together.
The effect is large. In our FPS calculator, upscaling plus frame generation takes an RTX 4070 from 57 to 126 fps at 4K — exactly the headroom a heavy ray-traced game needs. So the realistic recipe is: enable ray tracing in a game where it matters, turn on DLSS/FSR Quality, and check your numbers. Drop your CPU and GPU into the calculator first to see what you're working with, game by game, before you start spending frames on lighting.
Frequently asked questions
Does ray tracing lower FPS?
Yes, more than most graphics settings. Across 36 games TechSpot measured an average frame-rate drop of about 35% on an RTX 4090 with ray tracing on. A single ray-traced effect like reflections costs less (around 10-25%), full ray tracing more (20-40%), and path tracing the most — often 70-85%. The hit is also larger at higher resolutions, since it is pure GPU load.
Is ray tracing worth it?
It depends on the game. In titles built around it — Alan Wake II, Cyberpunk 2077, Metro Exodus Enhanced, Control — it genuinely transforms the look. In many others the difference is barely noticeable, and reviewers have found a few games where it even looks worse. For single-player games on a capable card, it is often worth it; for competitive shooters, frame rate matters more, so leave it off.
What is the difference between ray tracing and path tracing?
Standard ray tracing is hybrid: the game renders most of the scene the traditional fast way and adds a few ray-traced effects, like reflections or shadows, on top. Path tracing (Nvidia calls it "RT Overdrive") simulates nearly all the light in the scene at once. It looks far more realistic and is far more demanding — heavy enough to push even an RTX 4090 into the low 20s for frame rate at native 4K.
Do I need an RTX card for ray tracing?
Not specifically, but you need fairly modern hardware. Nvidia RTX cards (20-series and newer), AMD Radeon RX 6000/7000 cards, and Intel Arc all support ray tracing, though Nvidia generally runs it fastest. Older or entry-level GPUs technically support it in some games but rarely have the performance to make it playable with ray tracing on.
How do I run ray tracing without losing too many frames?
Pair it with upscaling. Turning on DLSS, FSR, or XeSS in Quality mode renders at a lower internal resolution and reconstructs the image, recovering much of the frame rate ray tracing costs; frame generation can smooth the result further. In our FPS calculator, upscaling plus frame generation takes an RTX 4070 from 57 to 126 fps at 4K — the kind of headroom a ray-traced game needs.
Before you spend frames on lighting, see how many you have to spare — game by game.