CPU_VS_GPU / 2026-09-11
Intel Core i5-11400FvsNVIDIA RTX 3080 10GB
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
2%
PERFECTLY BALANCED BUILD
Your CPU (Core i5-11400F) and GPU (RTX 3080 10GB) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-11400F
- GRAPHICSNVIDIA RTX 3080 10GB
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (535 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEPairing the Intel Core i5-11400F (58/100 on our gaming index) with the NVIDIA RTX 3080 10GB (42/100) raises one practical question: do they pull together, or does one hold the other back? We ran this exact combination across all supported resolutions to answer it with numbers rather than guesswork.
Straight answer: aim for 1440p
At 1080p the Core i5-11400F becomes the limiting part (~22% CPU bottleneck), whereas at 4K the RTX 3080 10GB is the limiting part (~38% GPU bottleneck). One number decides the purchase: 1440p is the most demanding of the standard 16:9 sizes that still sustains 63 FPS on average in AAA games, above the 60 FPS bar we treat as smooth. Step up a rung and the frame rate drops below that mark.
Think of resolution as a dial that splits the weight between CPU and GPU. Drop to 1080p and you wring out the RTX 3080 10GB while leaning harder on the Core i5-11400F; push to 4K and the opposite happens. Synergy here swings between 62% and 78% depending on where you sit.
Translated into actual games: In esports titles like Valorant this pair flies — around 413 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~21 FPS at 4K, which is where the RTX 3080 10GB's ceiling really shows. Overall, expect about 85 FPS average in AAA games at 1080p and around 41 FPS at 4K.
[CPU] Core i5-11400F
The Core i5-11400F (58/100 on the model's gaming scale) brings 6 cores and 12 threads and determines how many frames per second the system can prepare.
[GPU] RTX 3080 10GB
The RTX 3080 10GB (42/100 on the model's gaming scale) supplies the raster muscle of the build. Its 10 GB of GDDR6X set how far it can go on resolution and texture quality before video memory runs short.
A detail that's easy to overlook: Both parts come from nearby generations, which usually means a natural pairing with no platform surprises. 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 neither part appreciably holds the other back, so there is nothing you need to change. The Core i5-11400F and the RTX 3080 10GB stand as they are; a 700W supply gives the build headroom.
PRICE OF EACH PART
Affiliate links — we earn a small commission at no cost to you. Full disclosure
SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i5-11400F
- Cores6C / 12T
- Clock2.6 – 4.4 GHz
- TDP65 W
- SocketLGA1200
- Single-thread2,979
- Multi-thread16,869
- L3 cache12 MB
[GPU] NVIDIA RTX 3080 10GB
- VRAM10 GB GDDR6X
- Memory bus320-bit
- TDP320 W
- G3D Mark24,998
- Memory bandwidth760 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i5-11400F) partially limits the RTX 3080 10GB at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i5-11400F) and GPU (RTX 3080 10GB) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Your GPU (RTX 3080 10GB) is the limiting factor at 3440x1440 (Ultrawide 21:9). In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Your GPU (RTX 3080 10GB) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i5-11400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RTX 3080 10GB) severely limits the system at 4K, leaving the Core i5-11400F heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-11400F (65W) and RTX 3080 10GB (320W) add up to roughly 385W under load. Adding 150W for the rest of the system gives 535W, and with a 30% transient margin, 700W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 3080 10GB's memory bus (320-bit) and bandwidth (760 GB/s) describe its own video memory, meaning how fast the card reads its 10 GB of GDDR6X, 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 i5-11400F bottleneck the NVIDIA RTX 3080 10GB?
At 1080p the Core i5-11400F becomes the limiting part (~22% CPU bottleneck), whereas at 4K the RTX 3080 10GB is the limiting part (~38% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 70% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1440p, where AAA games average 63 FPS.
How many FPS do the Core i5-11400F and RTX 3080 10GB get at 1080p?
At 1080p this combination averages about 85 FPS in AAA games and around 262 FPS in esports titles. In Valorant we estimate up to 413 FPS.
Is this pairing good for 4K gaming?
Playable rather than smooth: about 41 FPS on average in AAA titles at 4K, with the RTX 3080 10GB setting the limit. Upscaling (DLSS, FSR or XeSS) or lower settings are the usual way to reach 60 FPS.
What power supply do I need for the Core i5-11400F and RTX 3080 10GB?
With an estimated combined draw of 385W across CPU and GPU, we recommend at least a 700W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 3080 10GB's 10 GB of VRAM enough?
10 GB covers all 11 tracked games at 1440p in the model; at 4K, 5 of them would need more, which costs frames or texture quality in those titles.