CPU_VS_GPU / 2026-09-11
Intel Core i7-8700KvsNVIDIA RTX 3070 Ti
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
7%
PERFECTLY BALANCED BUILD
Your CPU (Core i7-8700K) and GPU (RTX 3070 Ti) 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 i7-8700K
- GRAPHICSNVIDIA RTX 3070 Ti
- 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 ENGINEThe Intel Core i7-8700K and the NVIDIA RTX 3070 Ti each bring their own character. Below you'll see whether the union is balanced or whether one component wastes the other, with estimated FPS, power draw and recommendations tailored to this specific pair.
Verdict: play this build at 1080p
At 1080p the Core i7-8700K becomes the limiting part (~18% CPU bottleneck), whereas at 4K the RTX 3070 Ti is the limiting part (~46% GPU bottleneck). We put the target at 1080p: the highest of the usual 16:9 sizes where AAA titles still return 76 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 RTX 3070 Ti while leaning harder on the Core i7-8700K; push to 4K and the opposite happens. Synergy here swings between 54% and 82% depending on where you sit.
Translated into actual games: In esports titles like Valorant this pair flies — around 365 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~16 FPS at 4K, which is where the RTX 3070 Ti's ceiling really shows. Overall, expect about 76 FPS average in AAA games at 1080p and around 33 FPS at 4K.
[CPU] Core i7-8700K
The Core i7-8700K (54/100 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 3070 Ti
The RTX 3070 Ti scores 35/100 on this model's gaming scale. Its 8 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.
Beyond the FPS: The graphics card is about 4 years newer than the processor, so watch that the Core i7-8700K 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 i7-8700K and the RTX 3070 Ti stand as they are; a 700W supply gives the build headroom.
PRICE OF EACH PART
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SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i7-8700K
- Cores6C / 12T
- Clock3.7 – 4.7 GHz
- TDP95 W
- SocketLGA1151
- Single-thread2,714
- Multi-thread13,561
- L3 cache12 MB
[GPU] NVIDIA RTX 3070 Ti
- VRAM8 GB GDDR6X
- Memory bus256-bit
- TDP290 W
- G3D Mark23,610
- Memory bandwidth608.3 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i7-8700K) partially limits the RTX 3070 Ti at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i7-8700K) and GPU (RTX 3070 Ti) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Your GPU (RTX 3070 Ti) 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 3070 Ti) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i7-8700K heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RTX 3070 Ti) severely limits the system at 4K, leaving the Core i7-8700K heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i7-8700K (95W) and RTX 3070 Ti (290W) 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 3070 Ti's memory bus (256-bit) and bandwidth (608.3 GB/s) describe its own video memory, meaning how fast the card reads its 8 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 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 i7-8700K bottleneck the NVIDIA RTX 3070 Ti?
At 1080p the Core i7-8700K becomes the limiting part (~18% CPU bottleneck), whereas at 4K the RTX 3070 Ti is the limiting part (~46% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 66% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 1080p, where AAA games average 76 FPS.
How many FPS do the Core i7-8700K and RTX 3070 Ti get at 1080p?
At 1080p this combination averages about 76 FPS in AAA games and around 234 FPS in esports titles. In Valorant we estimate up to 365 FPS.
Is this pairing good for 4K gaming?
Playable rather than smooth: about 33 FPS on average in AAA titles at 4K, with the RTX 3070 Ti 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 i7-8700K and RTX 3070 Ti?
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 3070 Ti's 8 GB of VRAM enough?
8 GB falls short at 1440p for 3 of the 11 games the model tracks, and for 6 at 4K. In those titles expect to lower texture settings, or to see frame-time spikes if you do not.