CPU_VS_GPU / 2026-09-11
Intel Core i9-10900KvsAMD RX 7800 XT
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
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PERFECTLY BALANCED BUILD
Your CPU (Core i9-10900K) and GPU (RX 7800 XT) 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 i9-10900K
- GRAPHICSAMD RX 7800 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 (538 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEAre the Intel Core i9-10900K and the AMD RX 7800 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 (63/100) and the GPU (45/100), calibrated against measured benchmarks rather than synthetic scores, with the demand profile of each game.
Bottom line: this pair carries 1440p
At 1080p the Core i9-10900K becomes the limiting part (~19% CPU bottleneck), whereas at 4K the RX 7800 XT is the limiting part (~39% GPU bottleneck). We put the target at 1440p: the highest of the usual 16:9 sizes where AAA titles still return 66 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 RX 7800 XT. Here, efficiency moves from 81% at 1080p to 61% at 4K — which shows the part the frame rate depends on at each end.
Down to real numbers: In esports titles like Valorant this pair flies — around 477 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~25 FPS at 4K, which is where the RX 7800 XT's ceiling really shows. Overall, expect about 91 FPS average in AAA games at 1080p and around 44 FPS at 4K.
[CPU] Core i9-10900K
The Core i9-10900K (63/100 on the model's gaming scale) brings 10 cores and 20 threads and determines how many frames per second the system can prepare.
[GPU] RX 7800 XT
The RX 7800 XT scores 45/100 on this model's gaming scale. Its 16 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.
Beyond the FPS: The graphics card is about 3 years newer than the processor, so watch that the Core i9-10900K doesn't fall short in the most CPU-dependent games. You're combining an Intel platform with an AMD 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 i9-10900K and the RX 7800 XT 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 i9-10900K
- Cores10C / 20T
- Clock3.7 – 5.3 GHz
- TDP125 W
- SocketLGA1200
- Single-thread3,177
- Multi-thread24,055
- L3 cache20 MB
[GPU] AMD RX 7800 XT
- VRAM16 GB GDDR6
- Memory bus256-bit
- TDP263 W
- G3D Mark29,014
- Memory bandwidth624.1 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i9-10900K) partially limits the RX 7800 XT at 1920x1080. In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i9-10900K) and GPU (RX 7800 XT) are an exceptionally balanced match for gaming at 2560x1440. No realistic component swap would meaningfully improve this build.
Your GPU (RX 7800 XT) 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 (RX 7800 XT) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i9-10900K heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 7800 XT) severely limits the system at 4K, leaving the Core i9-10900K heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i9-10900K (125W) and RX 7800 XT (263W) add up to roughly 388W under load. Adding 150W for the rest of the system gives 538W, and with a 30% transient margin, 700W is the safe figure.
VIDEO MEMORY AND PCIe
The RX 7800 XT's memory bus (256-bit) and bandwidth (624.1 GB/s) describe its own video memory, meaning how fast the card reads its 16 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 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
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FREQUENTLY ASKED QUESTIONS
5Does the Intel Core i9-10900K bottleneck the AMD RX 7800 XT?
At 1080p the Core i9-10900K becomes the limiting part (~19% CPU bottleneck), whereas at 4K the RX 7800 XT is the limiting part (~39% 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 66 FPS.
How many FPS do the Core i9-10900K and RX 7800 XT get at 1080p?
At 1080p this combination averages about 91 FPS in AAA games and around 298 FPS in esports titles. In Valorant we estimate up to 477 FPS.
Is this pairing good for 4K gaming?
Playable rather than smooth: about 44 FPS on average in AAA titles at 4K, with the RX 7800 XT 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 i9-10900K and RX 7800 XT?
With an estimated combined draw of 388W across CPU and GPU, we recommend at least a 700W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RX 7800 XT's 16 GB of VRAM enough?
In the model, 16 GB covers all 11 games it tracks even at 4K with high textures, so video memory is not the constraint for this pairing.