Intel Core i5-8400 + Nvidia GeForce RTX 2070S Bottleneck at 1080p
Free bottleneck estimate for this CPU and GPU pairing at 1080p — calculator results update instantly below.
This page estimates how well the Intel Core i5-8400 and Nvidia GeForce RTX 2070S work together at 1080p. Run the calculator below to see bottleneck percentage, expected FPS, and which component is likely limiting performance.
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AI Build Analysis for This CPU and GPU Pairing
Guidance is based on calculator estimates. Actual FPS can vary by game engine, graphics settings, drivers, cooling, and background tasks.
Summary
With an Intel Core i5-8400 and an Nvidia GeForce RTX 2070 Super at 1920x1080, this build lands in an unusual spot: the calculator estimate shows a 20% bottleneck on the GPU side, with the graphics card acting as the main limiter and average performance around 56 FPS. At 1080p, that means the RTX 2070 Super is doing most of the heavy lifting while the i5-8400 is still generally capable of keeping pace in many games. The result is not a broken pairing, but it is not especially well matched for modern high-settings 1080p play if your target is a steady 60 FPS or higher. These calculator numbers are estimates rather than lab measurements, but they do point to a system that is mainly graphics-limited at this resolution.
Performance Expectation
Based on the provided figures, expect roughly 56 FPS on average, with dips to 39 FPS and peaks near 73 FPS at 1080p. In practice, that translates to playable performance in many single-player titles, but not always smooth enough to feel locked in during heavier scenes. Because the limiting component is the Nvidia GeForce RTX 2070 Super rather than the Intel Core i5-8400, the ceiling here is mostly set by shader load, effects quality, and scene complexity, not by the CPU running out of headroom first. You would notice the slowdowns most clearly when raising settings like ray tracing, heavier shadows, volumetrics, or high post-processing. A useful nuance: average FPS looks acceptable on paper, but the 39 FPS minimum suggests occasional drops that can feel more distracting than the average alone implies, especially if you are using a 60 Hz display without adaptive sync.
Upgrade Advice
The data supports a GPU-first upgrade, but only if your goal is better-than-60-FPS performance at 1080p or higher settings consistency. A 20% GPU-side bottleneck with a 56 FPS average and 39 FPS minimum is enough to justify looking at a faster graphics card before touching the Intel Core i5-8400. I would not rush to replace the CPU first, because the current numbers do not show it as the primary constraint. If you want to keep costs down, you can also tune settings selectively instead of upgrading immediately: lower the most expensive GPU-bound options such as ray tracing, ambient occlusion, shadow quality, and upscale where available. One caveat many guides miss: if you do upgrade the GPU substantially, the i5-8400 may then start to show its age in newer CPU-heavy games, so avoid overbuying on the graphics side unless a later platform update is also on the table.
Best Use Case
This Intel Core i5-8400 plus Nvidia GeForce RTX 2070 Super setup makes the most sense for players focused on 1080p single-player games, mixed game libraries, and moderate settings management rather than competitive high-refresh targets. At 1920x1080, it suits someone who is comfortable trading a few visual presets to stay close to a 60 FPS experience. It is also a reasonable fit for older AAA games, esports titles that are not especially demanding, and general desktop use with some creative work on the side. What it does not fit as well is a user expecting consistently high frame rates in recent graphically heavy releases with everything turned up.
Warning
The headline issue is not just that the GPU is the limiting part; it is that a 56 FPS average can hide uneven smoothness when minimums fall to 39 FPS. On an Intel Core i5-8400 and Nvidia GeForce RTX 2070 Super at 1080p, those lows may show up as brief heaviness in dense scenes, even when the game seems fine the rest of the time. Since calculator results are estimates, not bench-tested measurements, treat the 20% bottleneck as directionally useful rather than exact to the frame.
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