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Quick Answer
The i7-11700K is enough for the RTX 4080 at 4K, where performance matches modern CPUs within 2%. At 1440p, expect an 8-12% deficit compared to a 13700K. The Rocket Lake architecture limits this chip at lower resolutions, but it remains viable at higher ones.
The i7-11700K is an 8-core Rocket Lake CPU from 2021. It was not the most efficient CPU even at launch, but it still delivers solid gaming performance in 2026 when GPU-limited.
At 4K, the RTX 4080 does all the heavy lifting and the i7-11700K keeps up:
At 1440p, the gap becomes more visible in CPU-heavy titles:
If gaming at 4K, keep the 11700K. The upgrade cost of a new CPU, motherboard, and RAM will not be justified by a 2% improvement. If gaming at 1440p with competitive titles where frame rate matters, consider upgrading to a modern platform.
Our Verdict
The i7-11700K is fine for the RTX 4080 at 4K resolution. At 1440p, you lose some performance but the experience is still excellent. Only upgrade if you need peak competitive performance at high refresh rates.
No, the Ryzen 7 5800X3D does not bottleneck the RTX 4080 at 1440p or 4K. The 3D V-Cache gives this AM4 CPU gaming performance that rivals Zen 4 chips. At 4K, it performs identically to the 7800X3D. At 1440p, expect only a 3-5% gap.
No, the i7-12700K will not bottleneck the RTX 4080 Super at 4K. At 4K resolution, the GPU does nearly all the work. The 12700K's 8P+4E cores provide more than enough processing power, and you will see virtually identical performance to a 14900K at this resolution.
The Ryzen 7 5800X may bottleneck the RX 7900 XT by 8-12% at 1080p, but at 1440p the gap drops to 4-6%. At 4K, there is no meaningful bottleneck. The 5800X is still a capable gaming CPU but is showing its limits with top-tier GPUs.