CPU_VS_GPU / 2026-09-11
Intel Core i5-12400vsNVIDIA RTX 4080 SUPER
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
10%
ESTIMATED CPU BOTTLENECK
Your CPU (Core i5-12400) introduces a slight limitation at 2560x1440. Real-world impact is small and both components work well together.
Below 15% this is a normal imbalance: nothing needs changing to play well.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-12400
- GRAPHICSNVIDIA RTX 4080 SUPER
- 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 ENGINEThis page breaks down, number by number, what happens when you run an Intel Core i5-12400 alongside an NVIDIA RTX 4080 SUPER. The processor scores 70/100 and the graphics card 69/100 in our model — the interesting part is how they split the workload at each resolution.
Quick take: 4K is the resolution to target
At 1080p the Core i5-12400 becomes the limiting part (~29% CPU bottleneck), whereas at 4K the RTX 4080 SUPER is the limiting part (~20% GPU bottleneck). One number decides the purchase: 4K 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 4080 SUPER while leaning harder on the Core i5-12400; push to 4K and the opposite happens. Synergy here swings between 80% and 71% depending on where you sit.
Translated into actual games: In esports titles like Valorant this pair flies — around 574 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~41 FPS at 4K, which is where the RTX 4080 SUPER's ceiling really shows. Overall, expect about 110 FPS average in AAA games at 1080p and around 63 FPS at 4K.
[CPU] Core i5-12400
On the CPU side: the Core i5-12400 rates 70/100 for gaming in this model and brings 6 cores and 12 threads. At lower resolutions it's the one setting the pace for the whole system.
[GPU] RTX 4080 SUPER
The RTX 4080 SUPER scores 69/100 on this model's gaming scale. Its 16 GB of GDDR6X set how far it can go on resolution and texture quality before video memory runs short. It draws every pixel, so its weight grows the higher you push the resolution.
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.
WHAT TO CHANGE, AND WHAT IT COSTS
At 1440p the Core i5-12400 sets the frame rate and leaves part of the RTX 4080 SUPER idle. The imbalance is small (10%), so this is optional rather than a fix. The cheapest processor in our catalogue that keeps the card fully fed and clears our bar (at least 10% more frames) is the AMD Ryzen 5 7600: about 10% more in this model, with this card and 16 GB. It uses a different socket (AM5 instead of LGA1700), so the cost includes a motherboard.
The gain is the model's estimate at 2560x1440 with 16 GB, not a measurement of your PC, and prices change: check them at the retailer before deciding.
PRICE OF THIS PAGE'S PAIRING
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SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i5-12400
- Cores6C / 12T
- Clock2.5 – 4.4 GHz
- TDP65 W
- SocketLGA1700
- Single-thread3,552
- Multi-thread19,521
- L3 cache18 MB
[GPU] NVIDIA RTX 4080 SUPER
- VRAM16 GB GDDR6X
- Memory bus256-bit
- TDP320 W
- G3D Mark39,115
- Memory bandwidth736.3 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i5-12400) partially limits the RTX 4080 SUPER at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i5-12400) introduces a slight limitation at 2560x1440. Real-world impact is small and both components work well together.
Your CPU (Core i5-12400) and GPU (RTX 4080 SUPER) are an exceptionally balanced match for gaming at 3440x1440 (Ultrawide 21:9). No realistic component swap would meaningfully improve this build.
Your GPU (RTX 4080 SUPER) is the limiting factor at 5120x1440 (Super Ultrawide 32:9). In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
Your GPU (RTX 4080 SUPER) is the limiting factor at 4K. In graphically demanding titles you will see lower frame rates; a faster GPU would deliver a clear improvement.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-12400 (65W) and RTX 4080 SUPER (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 4080 SUPER's memory bus (256-bit) and bandwidth (736.3 GB/s) describe its own video memory, meaning how fast the card reads its 16 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 4K, 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. 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 i5-12400 bottleneck the NVIDIA RTX 4080 SUPER?
At 1080p the Core i5-12400 becomes the limiting part (~29% CPU bottleneck), whereas at 4K the RTX 4080 SUPER is the limiting part (~20% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 81% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 4K, where AAA games average 63 FPS.
How many FPS do the Core i5-12400 and RTX 4080 SUPER get at 1080p?
At 1080p this combination averages about 110 FPS in AAA games and around 352 FPS in esports titles. In Valorant we estimate up to 574 FPS.
Is this pairing good for 4K gaming?
Yes. At 4K this pairing averages about 63 FPS in AAA titles, at or above the 60 FPS we treat as smooth, with the RTX 4080 SUPER setting the limit.
What power supply do I need for the Core i5-12400 and RTX 4080 SUPER?
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 4080 SUPER's 16 GB of VRAM enough?
In the model, 16 GB covers all 11 games it tracks even at 4K with high textures, so video memory is not the constraint for this pairing.