CPU_VS_GPU / 2026-09-11
Intel Core i5-10600KvsNVIDIA RTX 5090
Complete bottleneck analysis at 1080p, 1440p, Ultrawide (UWQHD/SUWQHD), and 4K with estimated FPS for popular games.
41%
ESTIMATED CPU BOTTLENECK
Your CPU (Core i5-10600K) cannot feed the RTX 5090 fast enough at 2560x1440. The GPU sits waiting for frames, causing stutter and noticeable drops. A CPU upgrade is the highest-impact change you can make.
Load estimated by the model, not measured on your PC.
- PROCESSORIntel Core i5-10600K
- GRAPHICSNVIDIA RTX 5090
- MEMORY16GB DDR4/DDR5
- RESOLUTION2560x1440
Average across the demanding titles at 2560x1440.
Average across the competitive titles, where the processor leads.
What the build draws (850 W) plus headroom.
DEEP-DIVE ANALYSIS
GENERATED BY THE ENGINEPairing the Intel Core i5-10600K (56/100 on our gaming index) with the NVIDIA RTX 5090 (96/100) 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.
Quick take: 5K is the resolution to target
The Core i5-10600K sets the limit at both ends of the range, though it loosens as resolution climbs: ~48% CPU bottleneck at 1080p against ~14% at 4K. Of the common 16:9 sizes, the highest this pair holds above 60 FPS in AAA titles is 5K, where it averages 68 FPS — that is the resolution worth buying a monitor for. Across every resolution tested, ultrawides included, the system runs at 73% average efficiency.
Resolution reshuffles the priorities. At 1080p the Core i5-10600K's single-thread speed calls the shots; at 4K it's the raw muscle of the RTX 5090 that matters. That shift shows up in the numbers: 52% efficiency at 1080p versus 86% at 4K.
Translated into actual games: In esports titles like Valorant this pair flies — around 388 FPS at 1080p, plenty for a high-refresh monitor. At the other end, a demanding AAA like Elden Ring drops to ~60 FPS at 4K, which is where the RTX 5090's ceiling really shows. Overall, expect about 95 FPS average in AAA games at 1080p and around 87 FPS at 4K.
[CPU] Core i5-10600K
On the CPU side: the Core i5-10600K rates 56/100 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] RTX 5090
The RTX 5090 scores 96/100 on this model's gaming scale. Its 32 GB of GDDR7 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.
A detail that's easy to overlook: The graphics card is about 5 years newer than the processor, so watch that the Core i5-10600K 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.
WHAT TO CHANGE, AND WHAT IT COSTS
At 1440p the Core i5-10600K sets the frame rate and leaves part of the RTX 5090 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 i9-14900KS: about 95% more in this model, with this card and 16 GB. It uses a different socket (LGA1700 instead of LGA1200), 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] Intel Core i5-10600K
- Cores6C / 12T
- Clock4.1 – 4.8 GHz
- TDP125 W
- SocketLGA1200
- Single-thread2,911
- Multi-thread14,619
- L3 cache12 MB
[GPU] NVIDIA RTX 5090
- VRAM32 GB GDDR7
- Memory bus512-bit
- TDP575 W
- G3D Mark57,120
- Memory bandwidth1792 GB/s
BOTTLENECK BY RESOLUTION
SYNERGY · AVERAGE FPSYour CPU (Core i5-10600K) cannot feed the RTX 5090 fast enough at 1920x1080. The GPU sits waiting for frames, causing stutter and noticeable drops. A CPU upgrade is the highest-impact change you can make.
Your CPU (Core i5-10600K) cannot feed the RTX 5090 fast enough at 2560x1440. The GPU sits waiting for frames, causing stutter and noticeable drops. A CPU upgrade is the highest-impact change you can make.
Your CPU (Core i5-10600K) cannot feed the RTX 5090 fast enough at 3440x1440 (Ultrawide 21:9). The GPU sits waiting for frames, causing stutter and noticeable drops. A CPU upgrade is the highest-impact change you can make.
Your CPU (Core i5-10600K) partially limits the RTX 5090 at 5120x1440 (Super Ultrawide 32:9). In CPU-heavy scenes you will lose frames. Consider a CPU upgrade or a higher target resolution.
Your CPU (Core i5-10600K) introduces a slight limitation at 4K. Real-world impact is small and both components work well together.
ESTIMATED FPS BY GAME
1920x1080SYSTEM DIAGNOSTICS
POWER · VRAM & PCIe · RAMPOWER ESTIMATION
The Core i5-10600K (125W) and RTX 5090 (575W) add up to roughly 700W under load. Adding 150W for the rest of the system gives 850W, and with a 30% transient margin, 1150W is the safe figure.
VIDEO MEMORY AND PCIe
The RTX 5090's memory bus (512-bit) and bandwidth (1792 GB/s) describe its own video memory, meaning how fast the card reads its 32 GB of GDDR7, 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 5K, 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 i5-10600K bottleneck the NVIDIA RTX 5090?
The Core i5-10600K sets the limit at both ends of the range, though it loosens as resolution climbs: ~48% CPU bottleneck at 1080p against ~14% at 4K. Overall, there is some mismatch depending on resolution, with 73% average efficiency across the 12 resolutions our model tests. The resolution we would target with this pair is 5K, where AAA games average 68 FPS.
How many FPS do the Core i5-10600K and RTX 5090 get at 1080p?
At 1080p this combination averages about 95 FPS in AAA games and around 248 FPS in esports titles. In Valorant we estimate up to 388 FPS.
Is this pairing good for 4K gaming?
Yes. At 4K this pairing averages about 87 FPS in AAA titles, at or above the 60 FPS we treat as smooth.
What power supply do I need for the Core i5-10600K and RTX 5090?
With an estimated combined draw of 700W across CPU and GPU, we recommend at least an 1150W 80+ Gold supply (ideally ATX 3.0) to run with headroom.
Is the RTX 5090's 32 GB of VRAM enough?
In the model, 32 GB covers all 11 games it tracks even at 4K with high textures, so video memory is not the constraint for this pairing.