Processors/Comparison
15 specifications
Intel Core i5-11400F vs Intel Core i5-12400F
On paper, the Intel Core i5-12400F carries more L3 cache. Specifications describe what each chip is designed to do; how much of that either one holds under continuous load is a separate question.
Intel Core i5-11400F
Intel · Rocket Lake (11th gen) · Desktop
Intel Core i5-12400F
Intel · Alder Lake (12th gen) · Desktop
Cores and clocks
Cache and power
Platform
A check marks the higher figure only on rows where higher is unambiguously better. Rows without one are not ties; they are specifications where “better” has no meaning.
Reading the table
What the difference means.
A year apart
The Core i5-12400F (Alder Lake (12th gen), 2022) is a year newer than the Core i5-11400F (Rocket Lake (11th gen), 2021). That matters more than any single row in the table, because a newer design usually does more work in each clock cycle. Clock speeds are only a fair comparison between chips of the same generation; across generations, a lower number on the newer chip can still be the faster core.
Cache
The Core i5-12400F carries 18 MB of L3 cache against 12 MB. Cache is fast memory on the chip, and a larger one means the cores wait on main memory less often. Games, large spreadsheets and compiling respond to it; rendering and video export, which stream through data in order, respond much less.
Power and cooling
Both are rated at 65 W, so they ask the same of a cooler and a power supply. The rating is the heat to be moved for the chip to hold its speed; both draw above it in short bursts, and either one slows down rather than fails when the cooling falls short.
Platform
They use different sockets, FCLGA1200 and FCLGA1700, so moving from one to the other means a new motherboard, and new memory as well: FCLGA1200 takes DDR4, FCLGA1700 takes DDR4 or DDR5, depending on the motherboard. For an upgrade, that cost belongs in the comparison; for a new build, the newer platform is the one with later chips still to come.
What no table says
How much of its speed a processor keeps after the first minute depends on the cooling and the power limit of the machine it is in. If you own one of these, measure it: the test is free and runs in this browser.
Questions
- Is the Core i5-11400F better than the Core i5-12400F?
- On the specifications they are closely matched. No specification says how much speed either one keeps under a long load; that depends on the cooling and the power limit of the machine it is in, and it is what a sustained test measures.
- Do the Core i5-11400F and the Core i5-12400F use the same socket?
- No. The Core i5-11400F uses FCLGA1200 and the Core i5-12400F uses FCLGA1700, so switching means a new motherboard and new memory.
- Does the Core i5-11400F or the Core i5-12400F have integrated graphics?
- Neither does. Both need a graphics card to show a picture.
More comparisons
- Intel Core i5-11400F vs AMD Ryzen 5 2600X
- Intel Core i5-11400F vs AMD Ryzen 5 5500
- Intel Core i5-11400F vs Intel Core i5-10500
- Intel Core i5-11400F vs Intel Core i5-10400
- Intel Core i5-11400F vs Intel Core i5-10400F
- Intel Core i5-11400F vs Intel Core i5-9600K
- Intel Core i5-12400F vs Intel Core i5-12400
- Intel Core i5-12400F vs Intel Core i7-8700
- Intel Core i5-12400F vs Intel Core i5-9600K
- Intel Core i5-12400F vs Intel Core i5-10500
- Intel Core i5-12400F vs Intel Core i7-8700K
Every figure on this table is a design target. None of it is a measurement.
Nothing above describes how a processor behaves twenty minutes into a sustained workload, which is where two chips with nearly identical specifications routinely diverge. A boost clock is a ceiling the vendor permits, not a rate the chip sustains, and whether it holds depends on the cooling, the case, the power profile and the room. None of those appear on a specification sheet.
We deliberately do not reduce these figures to a single score. A composite invented from specifications would look authoritative and measure nothing, and choosing the weights would be choosing the winner.