CPU_VS_GPU / 2026-09-11
Intel Core i5-9400FvsNVIDIA RTX 3060 8GB
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
20%
ESTIMATED GPU BOTTLENECK
Your GPU (RTX 3060 8GB) is the limiting factor at 2560x1440. In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-9400F
- GRAPHICSNVIDIA RTX 3060 8GB
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (385 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEThe Intel Core i5-9400F and the NVIDIA RTX 3060 8GB each bring their own character. Below you'll see whether the union is balanced or whether one component wastes the other, with estimated FPS, power draw and recommendations tailored to this specific pair.
Quick take: 1440p with a setting or two turned down
At 1080p the two stay well balanced, whereas at 4K the RTX 3060 8GB is the limiting part (~57% GPU bottleneck). No 16:9 size keeps this pair above 60 FPS in demanding titles. 1440p is the highest that stays playable, at roughly 33 FPS on average in AAA. Esports is a different story — around 172 FPS at 1080p.
Think of resolution as a dial that splits the weight between CPU and GPU. Drop to 1080p and you wring out the RTX 3060 8GB while leaning harder on the Core i5-9400F; push to 4K and the opposite happens. Synergy here swings between 43% and 93% depending on where you sit.
Translated into actual games: In esports titles like Valorant this pair flies — around 275 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~8 FPS at 4K, which is where the RTX 3060 8GB's ceiling really shows. Overall, expect about 47 FPS average in AAA games at 1080p and around 18 FPS at 4K.
[CPU] Core i5-9400F
The Core i5-9400F scores 46/100 on this model's gaming scale, with 6 cores and 6 threads. In this pairing its job is to serve frames fast enough to never leave the graphics card waiting.
[GPU] RTX 3060 8GB
The RTX 3060 8GB (19/100 on the model's gaming scale) supplies the raster muscle of the build. Its 8 GB of GDDR6 set how far it can go on resolution and texture quality before video memory runs short.
Beyond the FPS: The graphics card is about 3 years newer than the processor, so watch that the Core i5-9400F doesn't fall short in the most CPU-dependent games. You're combining an Intel platform with an NVIDIA GPU — a perfectly valid mix that imposes no penalty.
DO YOU NEED TO CHANGE ANYTHING?
At 1440p the RTX 3060 8GB sets the frame rate. No card in our catalogue clears the bar we use for a recommendation: at least 25% more frames while the Core i5-9400F still keeps it fully fed. The closest, the NVIDIA RTX 5090, adds about 55% in this model. So there is no card we would tell you to buy for this pairing.
PRICE OF EACH PART
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SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i5-9400F
- Cores6C / 6T
- Clock2.9 – 4.1 GHz
- TDP65 W
- SocketLGA1151
- Single-thread2,421
- Multi-thread9,457
- L3 cache9 MB
[GPU] NVIDIA RTX 3060 8GB
- VRAM8 GB GDDR6
- Memory bus128-bit
- TDP170 W
- G3D Mark15,199
- Memory bandwidth240 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i5-9400F) and GPU (RTX 3060 8GB) are an exceptionally balanced match for gaming at 1920x1080. No realistic component swap would meaningfully improve this build.
Your GPU (RTX 3060 8GB) is the limiting factor at 2560x1440. In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Your GPU (RTX 3060 8GB) severely limits the system at 3440x1440 (Ultrawide 21:9), leaving the Core i5-9400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RTX 3060 8GB) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i5-9400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RTX 3060 8GB) severely limits the system at 4K, leaving the Core i5-9400F heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-9400F (65W) and RTX 3060 8GB (170W) add up to roughly 235W under load. Adding 150W for the rest of the system gives 385W, and with a 30% transient margin, 550W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 3060 8GB's memory bus (128-bit) and bandwidth (240 GB/s) describe its own video memory, meaning how fast the card reads its 8 GB of GDDR6, not the PCIe link to the processor. The PCIe link depends on the card, the processor and the motherboard slot together; our catalogue does not record PCIe generation or lane count, so the model does not estimate it. It matters most for cards with an eight-lane interface in older PCIe 3.0 boards: check the card's and the board's specifications.
SYSTEM MEMORY
This page assumes 16 GB in dual channel. At 1440p, the resolution recommended above, that meets the model's capacity target of 16 GB (enough for three in four of the games it covers), so more capacity would add little or nothing there. The target stays at 16 GB even at 4K, so a larger kit is for heavy multitasking or mods, not for these games. Memory speed and a second channel act on the processor's ceiling instead: they matter in the games the CPU limits, by an amount that depends on the game, and the calculator lets you enter your own kit.
HOW THIS PAGE IS CALCULATED
ENGINE v2026.08 · 2026-09-11CALCULATED, NOT WRITTEN
Every figure and every sentence comes from the same deterministic engine, driven by the catalogue specifications. That is what makes it reproducible: with the same engine version (2026.08) and the same catalogue, the same pairing always gives the same result. When either changes, the version and date above change with it, and the changelog says why.
WHERE THE DATA COMES FROM
Specifications come from the official AMD, Intel and NVIDIA datasheets together with PassMark and TechPowerUp. The gaming indices are calibrated against frame rates published by review outlets (TechPowerUp, TechSpot / Hardware Unboxed, Tom's Hardware, Gamers Nexus, Digital Foundry) rather than synthetic scores. That data is compiled, not measured here: this site runs no test bench of its own.
STATED LIMITS
Figures estimate native raster performance at high/ultra quality, with no ray tracing, upscaling or frame generation. We do not yet publish an externally validated error margin — the accuracy page states exactly where that stands.
* Affiliate disclosure: the Amazon links exist to show pricing. As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Recommendation order is decided by the engine and does not depend on commission.
TRY WITH YOUR OWN HARDWARE
Customize RAM, resolution, and discover upgrade recommendations.
FREQUENTLY ASKED QUESTIONS
5Does the Intel Core i5-9400F bottleneck the NVIDIA RTX 3060 8GB?
At 1080p the two stay well balanced, whereas at 4K the RTX 3060 8GB is the limiting part (~57% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 58% average efficiency across the 12 resolutions our model tests. 1440p is the highest resolution that stays playable, at about 33 FPS on average in AAA titles.
How many FPS do the Core i5-9400F and RTX 3060 8GB get at 1080p?
At 1080p this combination averages about 47 FPS in AAA games and around 172 FPS in esports titles. In Valorant we estimate up to 275 FPS.
Is this pairing good for 4K gaming?
Not for AAA titles at native high settings: about 18 FPS on average at 4K. It would take upscaling, much lower settings or faster hardware.
What power supply do I need for the Core i5-9400F and RTX 3060 8GB?
With an estimated combined draw of 235W across CPU and GPU, we recommend at least a 550W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 3060 8GB's 8 GB of VRAM enough?
8 GB falls short at 1440p for 3 of the 11 games the model tracks, and for 6 at 4K. In those titles expect to lower texture settings, or to see frame-time spikes if you do not.