Does the Core i5-10400F Bottleneck the RX 6600?
Short answer: Only at 1080p. The Core i5-10400F limits the RX 6600 by 21% at 1080p, which mostly shows in high-frame-rate games. At 1440p (3% CPU) and 4K (25% GPU) the pair is balanced, so this is a good match for a 1440p monitor.
- Best resolution for this pair: 1440p
- Bottleneck: 21% CPU at 1080p, 3% CPU at 1440p, 25% GPU at 4K
- Average FPS (9 demanding games, High): 72 at 1080p, 53 at 1440p, 29 at 4K
- Recommended power supply: 500 W or more
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Core i5-10400F + RX 6600 bottleneck at 1080p, 1440p and 4K
| Resolution | Bottleneck | Limiting part | What it means |
|---|---|---|---|
| 1080p | 21% | CPU (moderate) | The CPU often holds the card back. Free fixes help; a CPU upgrade helps more. |
| 1440p | 3% | CPU (balanced) | Balanced. Both parts are well used. |
| 4K | 25% | GPU (moderate) | The graphics card is fully used. This is the normal, healthy kind of limit. |
Core i5-10400F + RX 6600: bottleneck by type of game
The same pair can be balanced in one game and CPU-bound in another, because some games lean much harder on the processor. For this build the CPU is felt most in strategy and simulation games, at 42% at 1080p.
| Game type | 1080p | 1440p | 4K |
|---|---|---|---|
| Esports (CS2, Valorant) | 38% CPU | 28% CPU | 3% CPU |
| Battle royale (Fortnite, Warzone) | 21% CPU | 3% CPU | 25% GPU |
| Open world (Cyberpunk, RDR2) | 1% CPU | 18% GPU | 36% GPU |
| Strategy and simulation (Flight Sim, Cities) | 42% CPU | 34% CPU | 13% CPU |
| Racing (Forza, F1) | 12% CPU | 8% GPU | 31% GPU |
Core i5-10400F + RX 6600 FPS in popular games
Estimated average FPS and 1% lows on the High preset, native resolution, no ray tracing, with 16 GB of RAM. Across nine demanding games the RX 6600 with the Core i5-10400F averages about 72 FPS at 1080p, 53 FPS at 1440p and 29 FPS at 4K. At 1440p the processor sets the limit in Baldur's Gate 3.
| Game | 1080p High | 1440p High | 4K High |
|---|---|---|---|
| Counter-Strike 2 | 244 (176 low) | 174 (136 low) | 102 (79 low) |
| Valorant | 310 (223 low) | 238 (186 low) | 139 (108 low) |
| Fortnite | 104 (81 low) | 74 (58 low) | 43 (34 low) |
| Call of Duty: Black Ops 7 | 73 (57 low) | 42 (23 low) | 25 (14 low) |
| Battlefield 6 | 81 (59 low) | 58 (45 low) | 28 (15 low) |
| ARC Raiders | 89 (69 low) | 63 (49 low) | 37 (29 low) |
| Marvel Rivals | 63 (49 low) | 45 (35 low) | 26 (20 low) |
| Cyberpunk 2077 | 70 (55 low) | 50 (39 low) | 24 (13 low) |
| Black Myth: Wukong | 48 (38 low) | 34 (27 low) | 20 (16 low) |
| Hogwarts Legacy | 62 (45 low) | 48 (37 low) | 23 (12 low) |
| Baldur's Gate 3 | 62 (41 low) | 62 (45 low) | 37 (29 low) |
| Elden Ring | 60 (43 low) | 50 (39 low) | 29 (23 low) |
Core i5-10400F + RX 6600: specs at a glance
| Part | Key specs | Platform | Power |
|---|---|---|---|
| Core i5-10400F | 6 cores / 12 threads, Comet Lake (2020) | LGA1200, DDR4 | 65 W rated, up to about 134 W |
| RX 6600 | 8 GB GDDR6, RDNA 2 (2021) | FSR 3.1 upscaling and FSR Frame Generation (no FSR 4) | About 132 W board power |
Core i5-10400F + RX 6600: what to expect at each resolution
1080p
At 1080p the CPU bottleneck is 21%, so the RX 6600 will often run below full load. You will feel it most in fast multiplayer games and in 1% lows (stutter). Expect about 70 FPS in Cyberpunk 2077, 104 FPS in Fortnite and 244 FPS in Counter-Strike 2 on High.
1440p
At 1440p the pair is balanced (3% CPU), so both parts are well used. Expect about 50 FPS in Cyberpunk 2077, 74 FPS in Fortnite and 174 FPS in Counter-Strike 2 on High. The 8 GB of video memory runs short in Call of Duty: Black Ops 7 at these settings, so drop texture quality one step to avoid stutter.
4K
At 4K the RX 6600 is the limit (25% GPU), which is normal and means you are getting the card’s full speed, unlike at 1080p. Expect about 24 FPS in Cyberpunk 2077, 43 FPS in Fortnite and 102 FPS in Counter-Strike 2 on High. The 8 GB of video memory runs short in Call of Duty: Black Ops 7, Battlefield 6, Cyberpunk 2077, Hogwarts Legacy at these settings, so drop texture quality one step to avoid stutter. For 4K, turn on DLSS, FSR or XeSS in Quality or Balanced mode.
Core i5-10400F + RX 6600: best upgrade for this build
Upgrade the CPU first. The Core i5-10400F has no faster drop-in option worth buying on its LGA1200 platform, so the next step is a new platform such as AM5 with a Ryzen 7 7800X3D or 9800X3D. A faster graphics card would add little until the processor is faster. See the best CPU for the RX 6600.
Core i5-10400F + RX 6600: power supply for this pair
The Core i5-10400F can draw up to about 134 W and the RX 6600 about 132 W. With 100 W for the rest of the system and 25% headroom, a good 500 W power supply (80 Plus Gold or better) is a safe choice. Use the PSU wattage calculator to include your exact drives, fans and overclocking.
Core i5-10400F + RX 6600: settings tips for this pair
- Raise graphics settings and resolution: the GPU has spare power, the CPU does not. Higher settings cost almost no FPS here.
- Use native resolution or DLAA / FSR Native AA instead of a Performance upscaling mode, which would only shift more load to the CPU.
- Lower CPU-heavy settings: crowd density, object view distance, physics and simulation quality.
- Turn on XMP or EXPO so the RAM runs at its rated speed, and use two sticks for dual channel.
- Close browsers, launchers and overlays while gaming to free up CPU time.
Core i5-10400F + RX 6600: frequently asked questions
Does the Core i5-10400F bottleneck the RX 6600?
Only at 1080p. The Core i5-10400F limits the RX 6600 by 21% at 1080p, which mostly shows in high-frame-rate games. At 1440p (3% CPU) and 4K (25% GPU) the pair is balanced, so this is a good match for a 1440p monitor.
Is the Core i5-10400F good enough for the RX 6600 at 1440p?
Yes. At 1440p the bottleneck is 3% CPU, which is in the balanced range, so you get close to the card’s full speed.
How many FPS does the Core i5-10400F with the RX 6600 get?
On High settings we estimate about 72 FPS at 1080p and 53 FPS at 1440p on average across nine demanding games, for example 50 FPS in Cyberpunk 2077 at 1440p and 104 FPS in Fortnite at 1080p.
Should I upgrade the CPU or the GPU first?
The CPU. The graphics card already has spare power, so a faster GPU would add little until the processor is faster.
What power supply do I need for the Core i5-10400F and RX 6600?
About 500 W from a good brand with an 80 Plus Gold rating. That covers the CPU (up to about 134 W), the graphics card (about 132 W), the rest of the system and some headroom.
Core i5-10400F + RX 6600: related CPU and GPU pairs
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Sources: Tom’s Hardware GPU hierarchy, Tom’s Hardware CPU hierarchy, TechSpot CPU and GPU scaling tests, TechPowerUp GPU database, and manufacturer specifications from AMD, Intel and NVIDIA. Bottleneck and FPS figures come from our own bottleneck and FPS models.