CPU_VS_GPU / 2026-09-11
Intel Core i5-12400vsNVIDIA RTX 5070
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
7%
PERFECTLY BALANCED BUILD
Your CPU (Core i5-12400) and GPU (RTX 5070) 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 i5-12400
- GRAPHICSNVIDIA RTX 5070
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (465 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 5070. The processor scores 70/100 and the graphics card 48/100 in our model — the interesting part is how they split the workload at each resolution.
Straight answer: aim for 1440p
At 1080p the Core i5-12400 becomes the limiting part (~15% CPU bottleneck), whereas at 4K the RTX 5070 is the limiting part (~41% GPU bottleneck). We put the target at 1440p: the highest of the usual 16:9 sizes where AAA titles still return 70 FPS, which is above 60. The table below breaks out all twelve resolutions on their own, ultrawide formats included.
Resolution reshuffles the priorities. At 1080p the Core i5-12400's single-thread speed calls the shots; at 4K it's the raw muscle of the RTX 5070 that matters. That shift shows up in the numbers: 85% efficiency at 1080p versus 59% at 4K.
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 ~26 FPS at 4K, which is where the RTX 5070's ceiling really shows. Overall, expect about 95 FPS average in AAA games at 1080p and around 46 FPS at 4K.
[CPU] Core i5-12400
The Core i5-12400 scores 70/100 on this model's gaming scale, with 6 cores and 12 threads. In this pairing its job is to serve frames fast enough to never leave the graphics card waiting.
[GPU] RTX 5070
The RTX 5070 (48/100 on the model's gaming scale) supplies the raster muscle of the build. Its 12 GB of GDDR7 set how far it can go on resolution and texture quality before video memory runs short.
A detail that's easy to overlook: The graphics card is about 3 years newer than the processor, so watch that the Core i5-12400 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 neither part appreciably holds the other back, so there is nothing you need to change. The Core i5-12400 and the RTX 5070 stand as they are; a 650W supply gives the build headroom.
PRICE OF EACH PART
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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 5070
- VRAM12 GB GDDR7
- Memory bus192-bit
- TDP250 W
- G3D Mark32,150
- Memory bandwidth672 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i5-12400) partially limits the RTX 5070 at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i5-12400) and GPU (RTX 5070) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Your GPU (RTX 5070) 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 5070) 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 (RTX 5070) 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 RTX 5070 (250W) add up to roughly 315W under load. Adding 150W for the rest of the system gives 465W, and with a 30% transient margin, 650W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 5070's memory bus (192-bit) and bandwidth (672 GB/s) describe its own video memory, meaning how fast the card reads its 12 GB of GDDR7, 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 i5-12400 bottleneck the NVIDIA RTX 5070?
At 1080p the Core i5-12400 becomes the limiting part (~15% CPU bottleneck), whereas at 4K the RTX 5070 is the limiting part (~41% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 71% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1440p, where AAA games average 70 FPS.
How many FPS do the Core i5-12400 and RTX 5070 get at 1080p?
At 1080p this combination averages about 95 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?
Playable rather than smooth: about 46 FPS on average in AAA titles at 4K, with the RTX 5070 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 i5-12400 and RTX 5070?
With an estimated combined draw of 315W across CPU and GPU, we recommend at least a 650W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 5070'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.