CPU_VS_GPU / 2026-09-11
Intel Core i5-10400FvsAMD RX 6600
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
37%
ESTIMATED GPU BOTTLENECK
Your GPU (RX 6600) severely limits the system at 2560x1440, leaving the Core i5-10400F heavily underused. A faster GPU would improve performance dramatically.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-10400F
- GRAPHICSAMD RX 6600
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (347 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEPairing the Intel Core i5-10400F (52/100 on our gaming index) with the AMD RX 6600 (19/100) 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: 1440p, at about 33 FPS in AAA
The RX 6600 sets the limit at both ends of the range: a ~10% GPU bottleneck at 1080p that widens to ~68% at 4K. Straight up: this combination does not deliver a steady 60 FPS in AAA games. 1440p at about 33 FPS is the best compromise, and dropping a setting or two — or turning on DLSS/FSR — turns that into a comfortable frame rate.
Think of resolution as a dial that splits the weight between CPU and GPU. Drop to 1080p and you wring out the RX 6600 while leaning harder on the Core i5-10400F; push to 4K and the opposite happens. Synergy here swings between 32% and 90% depending on where you sit.
In esports titles like Valorant this pair flies — around 341 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Alan Wake 2 drops to ~8 FPS at 4K, which is where the RX 6600's ceiling really shows. Overall, expect about 49 FPS average in AAA games at 1080p and around 18 FPS at 4K.
[CPU] Core i5-10400F
On the CPU side: the Core i5-10400F rates 52/100 for gaming in this model and brings 6 cores and 12 threads. At lower resolutions it's the one setting the pace for the whole system.
[GPU] RX 6600
The RX 6600 (19/100 on the model's gaming scale) supplies the raster muscle of the build. Its 8 GB of GDDR6 set how far it can go on resolution and texture quality before video memory runs short.
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 Intel platform with an AMD GPU — a perfectly valid mix that imposes no penalty.
DO YOU NEED TO CHANGE ANYTHING?
At 1440p the RX 6600 sets the frame rate. No card in our catalogue clears the bar we use for a recommendation: at least 25% more frames while the Core i5-10400F still keeps it fully fed. The closest, the NVIDIA RTX 5090, adds about 90% in this model. So there is no card we would tell you to buy for this pairing.
PRICE OF EACH PART
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SPECIFICATIONS
CATALOGUE DATA[CPU] Intel Core i5-10400F
- Cores6C / 12T
- Clock2.9 – 4.3 GHz
- TDP65 W
- SocketLGA1200
- Single-thread2,540
- Multi-thread12,096
- L3 cache12 MB
[GPU] AMD RX 6600
- VRAM8 GB GDDR6
- Memory bus128-bit
- TDP132 W
- G3D Mark15,042
- Memory bandwidth224 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour GPU (RX 6600) is a slight limiting factor at 1920x1080, with limited real-world impact. Most titles will run smoothly.
Your GPU (RX 6600) severely limits the system at 2560x1440, leaving the Core i5-10400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6600) severely limits the system at 3440x1440 (Ultrawide 21:9), leaving the Core i5-10400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6600) severely limits the system at 5120x1440 (Super Ultrawide 32:9), leaving the Core i5-10400F heavily underused. A faster GPU would improve performance dramatically.
Your GPU (RX 6600) severely limits the system at 4K, leaving the Core i5-10400F heavily underused. A faster GPU would improve performance dramatically.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-10400F (65W) and RX 6600 (132W) add up to roughly 197W under load. Adding 150W for the rest of the system gives 347W, and with a 30% transient margin, 550W is the safe figure.
VIDEO MEMORY AND PCIe
The RX 6600's memory bus (128-bit) and bandwidth (224 GB/s) describe its own video memory, meaning how fast the card reads its 8 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
Customize RAM, resolution, and discover upgrade recommendations.
FREQUENTLY ASKED QUESTIONS
5Does the Intel Core i5-10400F bottleneck the AMD RX 6600?
The RX 6600 sets the limit at both ends of the range: a ~10% GPU bottleneck at 1080p that widens to ~68% at 4K. Overall, the GPU is the limit at high resolution, with 50% average efficiency across the 12 resolutions our model tests. 1440p is the highest resolution that stays playable, at about 33 FPS on average in AAA titles.
How many FPS do the Core i5-10400F and RX 6600 get at 1080p?
At 1080p this combination averages about 49 FPS in AAA games and around 207 FPS in esports titles. In Valorant we estimate up to 341 FPS.
Is this pairing good for 4K gaming?
Not for AAA titles at native high settings: about 18 FPS on average at 4K. It would take upscaling, much lower settings or faster hardware.
What power supply do I need for the Core i5-10400F and RX 6600?
With an estimated combined draw of 197W across CPU and GPU, we recommend at least a 550W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RX 6600'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.