CPU_VS_GPU / 2026-09-11
Intel Core i7-9700KvsNVIDIA RTX 3080 12GB
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
5%
PERFECTLY BALANCED BUILD
Your CPU (Core i7-9700K) and GPU (RTX 3080 12GB) 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 i7-9700K
- GRAPHICSNVIDIA RTX 3080 12GB
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (595 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEAre the Intel Core i7-9700K and the NVIDIA RTX 3080 12GB 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 (56/100) and the GPU (43/100), calibrated against measured benchmarks rather than synthetic scores, with the demand profile of each game.
Verdict: play this build at 1440p
At 1080p the Core i7-9700K becomes the limiting part (~31% CPU bottleneck), whereas at 4K the RTX 3080 12GB is the limiting part (~30% GPU bottleneck). Of the common 16:9 sizes, the highest this pair holds above 60 FPS in AAA titles is 1440p, where it averages 64 FPS — that is the resolution worth buying a monitor for. Across every resolution tested, ultrawides included, the system runs at 72% average efficiency.
As you climb from 1080p to 4K, the load shifts from the processor toward the graphics card: every extra pixel lands on the RTX 3080 12GB. Here, efficiency moves from 69% at 1080p to 70% at 4K — which shows the part the frame rate depends on at each end.
In esports titles like Valorant this pair flies — around 388 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~22 FPS at 4K, which is where the RTX 3080 12GB's ceiling really shows. Overall, expect about 81 FPS average in AAA games at 1080p and around 42 FPS at 4K.
[CPU] Core i7-9700K
The Core i7-9700K scores 56/100 on this model's gaming scale, with 8 cores and 8 threads. In this pairing its job is to serve frames fast enough to never leave the graphics card waiting.
[GPU] RTX 3080 12GB
The RTX 3080 12GB (43/100 on the model's gaming scale) supplies the raster muscle of the build. Its 12 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: The graphics card is about 4 years newer than the processor, so watch that the Core i7-9700K 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 i7-9700K and the RTX 3080 12GB stand as they are; an 800W supply gives the build headroom.
PRICE OF EACH PART
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SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i7-9700K
- Cores8C / 8T
- Clock3.6 – 4.9 GHz
- TDP95 W
- SocketLGA1151
- Single-thread2,857
- Multi-thread14,398
- L3 cache12 MB
[GPU] NVIDIA RTX 3080 12GB
- VRAM12 GB GDDR6X
- Memory bus384-bit
- TDP350 W
- G3D Mark26,559
- Memory bandwidth912 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i7-9700K) cannot feed the RTX 3080 12GB fast enough at 1920x1080. The GPU sits waiting for frames, causing stutter and noticeable drops. A CPU upgrade is the highest-impact change you can make.
Your CPU (Core i7-9700K) and GPU (RTX 3080 12GB) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Your CPU (Core i7-9700K) and GPU (RTX 3080 12GB) are an exceptionally balanced match for gaming at 3440x1440 (Ultrawide 21:9). No realistic component swap would meaningfully improve this build.
Your GPU (RTX 3080 12GB) 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 3080 12GB) severely limits the system at 4K, leaving the Core i7-9700K heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i7-9700K (95W) and RTX 3080 12GB (350W) add up to roughly 445W under load. Adding 150W for the rest of the system gives 595W, and with a 30% transient margin, 800W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 3080 12GB's memory bus (384-bit) and bandwidth (912 GB/s) describe its own video memory, meaning how fast the card reads its 12 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 i7-9700K bottleneck the NVIDIA RTX 3080 12GB?
At 1080p the Core i7-9700K becomes the limiting part (~31% CPU bottleneck), whereas at 4K the RTX 3080 12GB is the limiting part (~30% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 72% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1440p, where AAA games average 64 FPS.
How many FPS do the Core i7-9700K and RTX 3080 12GB get at 1080p?
At 1080p this combination averages about 81 FPS in AAA games and around 242 FPS in esports titles. In Valorant we estimate up to 388 FPS.
Is this pairing good for 4K gaming?
Playable rather than smooth: about 42 FPS on average in AAA titles at 4K, with the RTX 3080 12GB 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 i7-9700K and RTX 3080 12GB?
With an estimated combined draw of 445W across CPU and GPU, we recommend at least an 800W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 3080 12GB'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.