CPU_VS_GPU / 2026-09-11
Intel Core i5-12400vsAMD RX 6700 XT
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
36%
ESTIMATED GPU BOTTLENECK
Your GPU (RX 6700 XT) severely limits the system at 2560x1440, leaving the Core i5-12400 heavily underused. A faster GPU would improve performance dramatically.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-12400
- GRAPHICSAMD RX 6700 XT
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (445 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEAre the Intel Core i5-12400 and the AMD RX 6700 XT a good match? To find out we modelled the pair from 1080p up to 4K, cross-referencing the model's gaming scores for the CPU (70/100) and the GPU (27/100), calibrated against measured benchmarks rather than synthetic scores, with the demand profile of each game.
Verdict: play this build at 1080p
The RX 6700 XT sets the limit at both ends of the range: a ~13% GPU bottleneck at 1080p that widens to ~66% at 4K. We put the target at 1080p: the highest of the usual 16:9 sizes where AAA titles still return 62 FPS, which is above 60. The table below breaks out all twelve resolutions on their own, ultrawide formats included.
Think of resolution as a dial that splits the weight between CPU and GPU. Drop to 1080p and you wring out the RX 6700 XT while leaning harder on the Core i5-12400; push to 4K and the opposite happens. Synergy here swings between 34% and 87% depending on where you sit.
Down to real numbers: 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 ~13 FPS at 4K, which is where the RX 6700 XT's ceiling really shows. Overall, expect about 62 FPS average in AAA games at 1080p and around 27 FPS at 4K.
[CPU] Core i5-12400
The Core i5-12400 (70/100 on the model's gaming scale) brings 6 cores and 12 threads and determines how many frames per second the system can prepare.
[GPU] RX 6700 XT
The RX 6700 XT scores 27/100 on this model's gaming scale. Its 12 GB of GDDR6 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.
On the chemistry of the pair: Both parts come from nearby generations, which usually means a natural pairing with no platform surprises. You're combining an Intel platform with an AMD GPU — a perfectly valid mix that imposes no penalty.
WHAT TO CHANGE, AND WHAT IT COSTS
At 1440p the RX 6700 XT sets the frame rate, and the Core i5-12400 can drive a faster card. The cheapest card that clears our bar for a recommendation (at least 25% more frames) is the AMD RX 9070 GRE: about 30% more in this model, with this processor and 16 GB. This processor keeps up with cards up to the NVIDIA RTX 5070 Ti; anything between the two is an upgrade that gets used, and beyond that card the processor becomes the limit.
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] AMD RX 6700 XT
- VRAM12 GB GDDR6
- Memory bus192-bit
- TDP230 W
- G3D Mark19,225
- Memory bandwidth384 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour GPU (RX 6700 XT) is a slight limiting factor at 1920x1080, with limited real-world impact. Most titles will run smoothly.
Your GPU (RX 6700 XT) severely limits the system at 2560x1440, leaving the Core i5-12400 heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6700 XT) severely limits the system at 3440x1440 (Ultrawide 21:9), leaving the Core i5-12400 heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6700 XT) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i5-12400 heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6700 XT) severely limits the system at 4K, leaving the Core i5-12400 heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-12400 (65W) and RX 6700 XT (230W) add up to roughly 295W under load. Adding 150W for the rest of the system gives 445W, and with a 30% transient margin, 600W is the safe figure.
VIDEO MEMORY AND PCIe
The RX 6700 XT's memory bus (192-bit) and bandwidth (384 GB/s) describe its own video memory, meaning how fast the card reads its 12 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 1080p, 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 i5-12400 bottleneck the AMD RX 6700 XT?
The RX 6700 XT sets the limit at both ends of the range: a ~13% GPU bottleneck at 1080p that widens to ~66% at 4K. Overall, the GPU is the limit at high resolution, with 52% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1080p, where AAA games average 62 FPS.
How many FPS do the Core i5-12400 and RX 6700 XT get at 1080p?
At 1080p this combination averages about 62 FPS in AAA games and around 332 FPS in esports titles. In Valorant we estimate up to 574 FPS.
Is this pairing good for 4K gaming?
Not for AAA titles at native high settings: about 27 FPS on average at 4K. It would take upscaling, much lower settings or faster hardware.
What power supply do I need for the Core i5-12400 and RX 6700 XT?
With an estimated combined draw of 295W across CPU and GPU, we recommend at least a 600W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RX 6700 XT's 12 GB of VRAM enough?
12 GB covers all 11 tracked games at 1440p in the model; at 4K, 3 of them would need more, which costs frames or texture quality in those titles.