CPU_VS_GPU / 2026-09-11
AMD Ryzen 7 8700GvsNVIDIA RTX 4090
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
17%
ESTIMATED CPU BOTTLENECK
Your CPU (Ryzen 7 8700G) partially limits the RTX 4090 at 2560x1440. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Load estimated by the model, not measured on your PC.
- PROCESSORAMD Ryzen 7 8700G
- GRAPHICSNVIDIA RTX 4090
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (665 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEPairing the AMD Ryzen 7 8700G (72/100 on our gaming index) with the NVIDIA RTX 4090 (82/100) raises one practical question: do they pull together, or does one hold the other back? We ran this exact combination across all supported resolutions to answer it with numbers rather than guesswork.
Straight answer: aim for 4K
At 1080p the Ryzen 7 8700G becomes the limiting part (~29% CPU bottleneck), whereas at 4K the RTX 4090 is the limiting part (~12% GPU bottleneck). We put the target at 4K: the highest of the usual 16:9 sizes where AAA titles still return 75 FPS, which is above 60. The table below breaks out all twelve resolutions on their own, ultrawide formats included.
As you climb from 1080p to 4K, the load shifts from the processor toward the graphics card: every extra pixel lands on the RTX 4090. Here, efficiency moves from 71% at 1080p to 88% at 4K — which shows the part the frame rate depends on at each end.
Translated into actual games: In esports titles like Valorant this pair flies — around 603 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~52 FPS at 4K, which is where the RTX 4090's ceiling really shows. Overall, expect about 119 FPS average in AAA games at 1080p and around 75 FPS at 4K.
[CPU] Ryzen 7 8700G
The Ryzen 7 8700G (72/100 on the model's gaming scale) brings 8 cores and 16 threads and determines how many frames per second the system can prepare.
[GPU] RTX 4090
On the graphics side, the RTX 4090 rates 82/100 for gaming in this model. Its 24 GB of GDDR6X set how far it can go on resolution and texture quality before video memory runs short. The higher the resolution, the more of the frame rate depends on it.
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 AMD platform with an NVIDIA GPU — a perfectly valid mix that imposes no penalty.
WHAT TO CHANGE, AND WHAT IT COSTS
At 1440p the Ryzen 7 8700G sets the frame rate and leaves part of the RTX 4090 idle. The cheapest processor in our catalogue that keeps the card fully fed and clears our bar (at least 10% more frames) is the Intel Core i5-14600KF: about 20% more in this model, with this card and 16 GB. It uses a different socket (LGA1700 instead of AM5), 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] AMD Ryzen 7 8700G
- Cores8C / 16T
- Clock4.2 – 5.1 GHz
- TDP65 W
- SocketAM5
- Single-thread3,922
- Multi-thread31,519
- L3 cache16 MB
[GPU] NVIDIA RTX 4090
- VRAM24 GB GDDR6X
- Memory bus384-bit
- TDP450 W
- G3D Mark39,604
- Memory bandwidth1008 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Ryzen 7 8700G) partially limits the RTX 4090 at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Ryzen 7 8700G) partially limits the RTX 4090 at 2560x1440. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Ryzen 7 8700G) and GPU (RTX 4090) are an exceptionally balanced match for gaming at 3440x1440 (Ultrawide 21:9). No realistic component swap would meaningfully improve this build.
Your CPU (Ryzen 7 8700G) and GPU (RTX 4090) are an exceptionally balanced match for gaming at 5120x1440 (Super Ultrawide 32:9). No realistic component swap would meaningfully improve this build.
Your GPU (RTX 4090) is a slight limiting factor at 4K, with limited real-world impact. Most titles will run smoothly.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Ryzen 7 8700G (65W) and RTX 4090 (450W) add up to roughly 515W under load. Adding 150W for the rest of the system gives 665W, and with a 30% transient margin, 900W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 4090's memory bus (384-bit) and bandwidth (1008 GB/s) describe its own video memory, meaning how fast the card reads its 24 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 AMD Ryzen 7 8700G bottleneck the NVIDIA RTX 4090?
At 1080p the Ryzen 7 8700G becomes the limiting part (~29% CPU bottleneck), whereas at 4K the RTX 4090 is the limiting part (~12% GPU bottleneck). Overall, the GPU is the limit at high resolution, with 84% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 4K, where AAA games average 75 FPS.
How many FPS do the Ryzen 7 8700G and RTX 4090 get at 1080p?
At 1080p this combination averages about 119 FPS in AAA games and around 368 FPS in esports titles. In Valorant we estimate up to 603 FPS.
Is this pairing good for 4K gaming?
Yes. At 4K this pairing averages about 75 FPS in AAA titles, at or above the 60 FPS we treat as smooth, with the RTX 4090 setting the limit.
What power supply do I need for the Ryzen 7 8700G and RTX 4090?
With an estimated combined draw of 515W across CPU and GPU, we recommend at least a 900W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 4090's 24 GB of VRAM enough?
In the model, 24 GB covers all 11 games it tracks even at 4K with high textures, so video memory is not the constraint for this pairing.