Core i9-11900KF vs Core i5-12400F
Compare the Core i9-11900KF and Core i5-12400F on real gaming and productivity benchmarks, full specifications, live retailer prices and performance-per-dollar, then jump straight to the cheapest in-stock option.
The short answer
The Core i5-12400F is the better value, though the Core i9-11900KF is the faster gaming chip.
- Gaming performance is effectively a wash at 1080p (index 53.7 vs 53.0); at 1440p and 4K the GPU sets the frame rate, so the gap shrinks further.
- Core i9-11900KF is roughly 35% faster in multi-core work, an edge in rendering, encoding and compiling.
- Core i5-12400F is the cheaper chip right now, by roughly 172%.
- Core i5-12400F delivers about 169% more gaming performance per dollar.
- Core i9-11900KF has more cores (8C/16T vs 6C/12T), which helps in heavily threaded workloads.
- Core i5-12400F has a lower TDP (65W vs 125W), so it runs cooler and is easier to cool quietly.
Gaming performance
CPU-bound gaming score: a geometric mean of in-game frame rates at 1080p, normalized so the fastest gaming CPU we track = 100.
Does the CPU matter at 1440p or 4K? Much less. At higher resolutions the graphics card sets the frame rate, so the gap between two CPUs shrinks — often to nothing. The 1080p figure above is the demanding case, where the CPU is stressed and the difference actually shows.
Performance per dollar
Gaming index divided by the current lowest price — higher is better value. This moves with the market as prices change day to day.
The Core i5-12400F gives about 169% more gaming performance per dollar at today’s prices.
Full platform cost
A complete-platform price needs a live CPU price and an in-stock compatible motherboard on both sides. We can’t build one for Core i9-11900KF right now, which is common for older sockets like AM4 where we don’t track current boards. The gaming, value and specs comparisons still apply.
Specs head-to-head
Productivity & compute
Efficiency
Gaming performance per watt (gaming index per 100W of TDP) — higher means more frames for the heat and power.
Where to buy
Core i5-12400Ffrom $164.93
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Amazon | In stock | $164.93 |  |
Core i9-11900KFfrom $449.00
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Amazon | In stock | $449.00 | |
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