Intel Core i3-12100F vs Intel Core i5-9400F Comparison

Where Each One Wins

The Intel Core i3-12100F and Intel Core i5-9400F occupy the same overall percentile ranking in the database, both sitting at the 68th percentile against all CPUs. That shared position, however, masks a clear performance split. The i3-12100F wins 17 of the 19 head-to-head benchmark comparisons, while the i5-9400F takes only 2. The data paints a straightforward picture: the newer 12th Gen part dominates nearly every workload category, with the older 9th Gen chip holding only narrow advantages in two specialized instruction-level tasks.

For users prioritizing single-threaded responsiveness, the i3-12100F is the decisive choice. Its single-core results are consistently higher across Cinebench R15, R20, R23, Geekbench, and PassMark, with deltas ranging from 41.8% to 47.7%. That translates directly to snappier everyday operation, faster application launches, and better performance in lightly threaded software. The i3-12100F also wins all multi-core tests, including Cinebench R23 multicore by 47.5%, which makes it the stronger pick for threaded productivity workloads such as video encoding and 3D rendering.

The i5-9400F retains two niche wins. It edges ahead in PassMark extended instructions by 7.2% and in PassMark random string sorting by 3%. These are narrow margins, and they point to specific legacy instruction patterns or sorting algorithms where the older Coffee Lake design still holds a slight edge. Outside those two tests, the i5-9400F is behind everywhere, often by substantial margins.

The i3-12100F also has a meaningful advantage in data encryption, scoring 178.1% higher in PassMark data encryption. That is the largest delta in the entire comparison and suggests the Alder Lake architecture brings substantially improved cryptographic instruction throughput. For anyone running encrypted storage or VPN workloads, this is a significant differentiator.

The i5-9400F does offer two physical advantages on paper: six cores versus four and a higher TDP of 65 watts versus 58 watts. But those extra cores do not translate into benchmark wins because the i5-9400F lacks Hyper-Threading (6 threads total) while the i3-12100F has 8 threads. The combination of fewer threads, an older 14 nm process, and lower clock speeds leaves the i5-9400F trailing even in heavily threaded tests where its extra cores might have helped.

FAQ

Q: Which CPU is faster in single-threaded performance?

A: The Intel Core i3-12100F wins every single-thread benchmark in the database. It leads by 47.4% in Cinebench R15 single-core, 47.7% in Cinebench R20 single-core, 47.5% in Cinebench R23 single-core, 43.8% in Geekbench single-core, and 41.8% in PassMark single-thread.

Q: Does the i5-9400F's six-core design beat the i3-12100F's four cores in multi-threaded work?

A: No. The i3-12100F wins every multi-threaded test despite having fewer physical cores. It leads by 47.5% in Cinebench R23 multicore, 42% in Geekbench multicore, and 48.2% in PassMark multithread. The i3-12100F has 8 threads versus 6 on the i5-9400F, which offsets the core count disadvantage.

Q: Are there any tests where the i5-9400F wins?

A: Yes, two. The i5-9400F wins PassMark extended instructions by 7.2% and PassMark random string sorting by 3%. These are the only two benchmarks out of 19 where the i5-9400F comes out ahead.

Q: How do their overall benchmark averages compare?

A: The i3-12100F has an average benchmark score of 13,494, while the i5-9400F averages 13,041. Both CPUs sit at the 68th percentile against all CPUs in the database.

Q: What is the largest performance gap between the two?

A: The biggest margin is in PassMark data encryption, where the i3-12100F scores 8,071 versus 2,902 for the i5-9400F, a 178.1% advantage.

Q: Which CPU is still in production?

A: The Intel Core i3-12100F is listed as Active in production status. The Intel Core i5-9400F is marked End-of-life.

Head-to-Head Benchmarks

The benchmark data is remarkably one-sided. Across 19 recorded comparisons, the i3-12100F wins 17, and several of those wins are lopsided. The largest victory comes in PassMark data encryption, where the i3-12100F scores 8,071 against 2,902 for the i5-9400F, a 178.1% delta. This suggests a generational leap in encryption-related instruction efficiency that goes far beyond raw clock speed differences.

Cinebench results are consistent across all three versions. In Cinebench R15 multicore, the i3-12100F scores 1,195 versus 810, a 47.5% lead. The single-core R15 result is similar: 168 versus 114, a 47.4% advantage. Cinebench R20 multicore shows 4,981 versus 3,376 (47.5% ahead), and R20 single-core shows 703 versus 476 (47.7% ahead). Cinebench R23 multicore continues the pattern with 11,860 versus 8,040, again a 47.5% gap, while R23 single-core is 1,674 versus 1,135, a 47.5% delta. The uniformity of these margins across different Cinebench versions indicates a consistent architectural advantage rather than a workload-specific quirk.

Geekbench results follow the same trajectory. The multicore score is 7,252 for the i3-12100F versus 5,106 for the i5-9400F, a 42% lead. The single-core score is 1,932 versus 1,344, a 43.8% advantage. These are substantial gaps that align with the Cinebench findings.

PassMark's suite reveals where the i5-9400F still competes. In extended instructions, the i5-9400F scores 11,684 against 10,842, a 7.2% win. In random string sorting, it scores 16,298 versus 15,809, a 3% edge. These are the only two tests where the older chip comes out ahead, and both margins are modest compared to the i3-12100F's victories elsewhere.

Elsewhere in PassMark, the i3-12100F dominates. Integer math shows 40,978 versus 26,155, a 56.7% lead. Floating point math is 31,977 versus 22,465, a 42.3% edge. Find prime numbers is 60 versus 38, a 57.9% advantage. Physics is 985 versus 653, a 50.8% lead. Multithread is 14,015 versus 9,455, a 48.2% gap. Data compression is 160,452 versus 132,877, a 20.8% lead. Single-thread is 3,444 versus 2,428, a 41.8% advantage.

The data compression result is notable because the i5-9400F's 132,877 score is respectable in absolute terms, yet the i3-12100F still beats it by over 20%. The single-thread PassMark result of 3,444 versus 2,428 further confirms that the i3-12100F's per-core performance is in a different class.

Specification Differences

The two CPUs differ across nearly every major specification category. The i3-12100F uses a 4-core, 8-thread configuration with a base clock of 3.30 GHz and a boost clock of 4.30 GHz. The i5-9400F uses 6 cores and 6 threads with a base clock of 2.90 GHz and a boost clock of 4.10 GHz. Despite having fewer cores, the i3-12100F has higher clock speeds at both base and boost.

Power ratings differ as well. The i3-12100F has a TDP of 58 watts, while the i5-9400F is rated at 65 watts. The newer chip delivers more performance while drawing less power according to the TDP figures.

Socket compatibility is completely different. The i3-12100F uses Intel Socket 1700, while the i5-9400F uses Intel Socket 1151. This means the two CPUs are not interchangeable in any motherboard.

Memory support also diverges. The i3-12100F supports both DDR4 and DDR5 memory, while the i5-9400F supports only DDR4. Both use dual-channel memory buses. The i5-9400F has a listed memory bandwidth of 42.7 GB/s, while no bandwidth figure is recorded for the i3-12100F.

PCIe capabilities differ by generation. The i3-12100F supports PCIe Gen 5 with 16 lanes from the CPU. The i5-9400F supports PCIe Gen 3 with 16 lanes from the CPU. This gives the i3-12100F access to newer, faster expansion hardware.

Production status separates the two as well. The i3-12100F is Active, while the i5-9400F is End-of-life. The i5-9400F has a recorded release date of January 7, 2019, while no release date is listed for the i3-12100F. The i3-12100F has a launch MSRP of $97; no launch MSRP is recorded for the i5-9400F. Neither CPU has an unlocked multiplier.

Architecture Differences

The architectural gap between these two CPUs is substantial. The i3-12100F is built on the Alder Lake architecture with the Alder Lake-S codename, part of Intel's Core 12th Gen family. The i5-9400F uses the Coffee Lake architecture with the Coffee Lake codename, belonging to the Core i5 Coffee Lake Refresh generation.

Manufacturing process is a major differentiator. The i3-12100F uses a 10 nm process node, while the i5-9400F uses a 14 nm node. Both are fabricated by Intel. The die size for the i3-12100F is listed at 163 mm², while no die size is recorded for the i5-9400F.

Cache hierarchies differ in both size and organization. The i3-12100F has 80 KB of L1 cache per core and 1.25 MB of L2 cache per core, with 12 MB of shared L3 cache. The i5-9400F has 64 KB of L1 cache per core and 256 KB of L2 cache per core, with 9 MB of shared L3 cache. The i3-12100F's larger per-core L2 cache is particularly significant, as it reduces reliance on slower L3 and main memory accesses.

Neither CPU includes integrated graphics, which is expected for F-series parts. Both support non-ECC memory only. The i3-12100F's part number is SRL63, while the i5-9400F has a longer part number string starting with BX80684I59400F.

The architectural differences explain the benchmark results. The 10 nm Alder Lake design brings a newer microarchitecture with higher instructions per clock, which shows up directly in the consistent 41.8% to 47.7% single-thread advantages. The i3-12100F's 8 threads versus 6 on the i5-9400F, combined with higher boost clocks, also explains why it wins multi-threaded tests despite having two fewer physical cores. The i5-9400F's only wins, in extended instructions and random string sorting, point to specific instruction sequences where the older Coffee Lake design still has a measurable edge, but those are isolated cases rather than a general trend.