Intel Core i5-12600K vs Intel Core i9-12900H Comparison

Head-to-Head Benchmarks

The recorded data shows a clear overall victory for the Intel Core i5-12600K, which takes 17 of the 23 head-to-head benchmark comparisons. The desktop part's wins are often decisive, particularly in threaded workloads where the mobile i9 cannot keep pace. The i5-12600K leads by 19% in 3DMark 16-thread testing (7975 versus 6457), by 17.4% in 8-thread (6144 versus 5074), and by 13% in max-thread (7966 versus 6927). These are substantial margins, suggesting the i5's higher sustained clock behavior and desktop power envelope translate directly into measurable performance advantages in heavily parallel synthetic tests.

The i5-12600K also dominates in Cinebench multi-core results. In Cinebench R23 multi-core, it scores 17491 against the i9-12900H's 15946.5, an 8.8% advantage. Cinebench R20 multi-core shows a smaller 3.3% gap (9821 versus 9501), while R15 multi-core is nearly a tie, with the i9-12900H actually edging ahead by 0.8% (2576.5 versus 2555). This pattern suggests that as the workload scales in duration and complexity, the i5-12600K's advantage grows, likely due to its ability to sustain higher multi-core performance over longer runs.

In single-thread tests, the i5-12600K wins every comparison, though margins are modest. The largest single-thread gap is in PassMark single-thread, where the i5 leads by 5.3% (3926 versus 3717). Cinebench R23 single-core shows a 2.3% edge (1907 versus 1863.5), and 3DMark single-thread is nearly flat at 1.7% (1016 versus 999). The i5's 4.90 GHz boost clock versus the i9's 5.00 GHz does not translate into a win for the mobile part; instead, the desktop chip's superior per-core efficiency at lower clocks appears to carry the day.

The i9-12900H does claim six wins, and they are concentrated in specific workload types. Its most significant victory is in PassMark find prime numbers, where it scores 107 versus 91, a 17.6% advantage. PassMark physics also favors the i9 by 15% (1753 versus 1525), and PassMark integer math shows a 6.9% lead (93828 versus 87776). Floating-point math is a narrow i9 win at 1.1% (67940 versus 67217), and data encryption is essentially a tie, with the i9 ahead by 0.3% (18548 versus 18485). These results indicate that the i9-12900H's higher core count (14 versus 10) and thread count (20 versus 16) provide a genuine edge in certain compute-heavy integer and physics-oriented tasks, even if the overall benchmark average favors the i5.

The remaining head-to-head results are all i5-12600K wins with varying margins. PassMark extended instructions shows a 14.2% gap (22002 versus 18875), data compression an 8% gap (344071 versus 316714), and 4-thread 3DMark a 10.4% gap (3794 versus 3398). The i5 also wins PassMark multithread by 1% (27608 versus 27340), random string sorting by 1.1% (35704 versus 35296), and 2-thread 3DMark by 4.9% (1989 versus 1891). Even where the i9-12900H has more physical cores, the i5-12600K's higher base clock (3.70 GHz versus 2.50 GHz) and desktop-class power delivery seem to overcome the core-count deficit in most workloads.

The database's overall average benchmark scores reflect this split. The i9-12900H has an average score of 28003, placing it at the 80th percentile of all CPUs, while the i5-12600K averages 27578, at the 79th percentile. The i9's nearest rivals include the AMD Ryzen 5 PRO 5655G (average 28032, delta -0.1%) and the Intel Core i5-14500T (average 28065, delta -0.2%). The i5-12600K's nearest rival is the AMD Ryzen 7 5700X, with an identical average score of 27578 and a delta of 0%. These proximity values suggest both chips sit in a tightly contested performance band, where small workload-specific differences matter more than overall averages.

FAQ

Q: Which processor wins more head-to-head benchmark comparisons?

A: The Intel Core i5-12600K wins 17 of 23 comparisons, while the Intel Core i9-12900H wins 6.

Q: Where does the i9-12900H show its biggest advantage over the i5-12600K?

A: The i9-12900H leads by 17.6% in PassMark find prime numbers (107 versus 91) and by 15% in PassMark physics (1753 versus 1525).

Q: How large is the i5-12600K's lead in multi-threaded 3DMark testing?

A: The i5-12600K leads by 19% in 3DMark 16-thread (7975 versus 6457), by 17.4% in 8-thread (6144 versus 5074), and by 13% in max-thread (7966 versus 6927).

Q: Is the i9-12900H ahead in any Cinebench multi-core test?

A: Yes, in Cinebench R15 multi-core the i9-12900H scores 2576.5 versus 2555, a 0.8% advantage. In R20 and R23 multi-core, the i5-12600K leads by 3.3% and 8.8% respectively.

Q: What are the average benchmark scores and percentiles for each chip?

A: The i9-12900H has an average benchmark score of 28003 (80th percentile), while the i5-12600K averages 27578 (79th percentile).

Q: Which chip has a higher boost clock, and does it win single-thread tests?

A: The i9-12900H has a 5.00 GHz boost clock versus the i5-12600K's 4.90 GHz, yet the i5-12600K wins every single-thread comparison, including a 5.3% edge in PassMark single-thread.

The Verdict

The data supports a clear recommendation for different use cases. The Intel Core i5-12600K is the stronger overall performer in the benchmark suite, winning 74% of head-to-head comparisons and leading in all single-thread tests, all 3DMark multi-thread tests, and the majority of Cinebench multi-core runs. Users prioritizing raw threaded throughput in synthetic workloads, particularly 3DMark and newer Cinebench versions, should select the i5-12600K. Its 19% lead in 3DMark 16-thread and 8.8% lead in Cinebench R23 multi-core are decisive margins that would likely translate into better performance in rendering, video encoding, and other heavily threaded applications.

The Intel Core i9-12900H is the better choice for workloads that stress integer math, prime number computation, and physics simulation. Its 17.6% lead in PassMark find prime numbers and 15% lead in PassMark physics are substantial, and its 6.9% advantage in integer math suggests a genuine strength in compute-intensive integer tasks. The i9 also holds a narrow edge in floating-point math (1.1%) and data encryption (0.3%), making it a viable option for mixed scientific or financial workloads. However, its overall average benchmark score of 28003 versus 27578 for the i5 is a modest 1.5% difference, and it sits at a comparable percentile (80 versus 79). Given that the i5-12600K wins more total tests and often by larger margins, the data favors the desktop chip for most users. The i9-12900H's wins, while real, are concentrated in fewer workload categories.

Specification Differences

The two processors differ in several fundamental specifications. The Intel Core i9-12900H has 14 cores and 20 threads, while the Intel Core i5-12600K has 10 cores and 16 threads. Base clocks differ significantly: the i9-12900H runs at 2.50 GHz, while the i5-12600K runs at 3.70 GHz. Boost clocks are closer, with the i9 at 5.00 GHz and the i5 at 4.90 GHz. Thermal design power differs substantially: the i9-12900H is rated at 45 W, while the i5-12600K is rated at 125 W. The i9 uses an Intel BGA 1744 socket, while the i5 uses Intel Socket 1700. The i9's market segment is Mobile, while the i5 is Desktop. The i5 has an unlocked multiplier, while the i9 does not. The i9's integrated graphics are Iris Xe 96EU, while the i5 uses UHD Graphics 770. The i5 has a launch MSRP of $289; the i9 has no recorded launch MSRP. The i9 was released on 2022-01-03, while the i5 was released on 2021-11-03. The part numbers differ: SRLD4 for the i9, SRL4T for the i5.

Architecture Differences

Both processors belong to Intel's Core 12th Gen series and use the Alder Lake architecture, but they come from different product line segments. The i9-12900H is based on Alder Lake-H, the mobile high-performance variant, while the i5-12600K is based on Alder Lake-S, the desktop variant. Both are built on Intel's 10 nm process node and manufactured by Intel. Die sizes are nearly identical: 217 mm² for the i9 and 215 mm² for the i5. Cache configurations differ in L3: the i9 has 24 MB shared L3 cache, while the i5 has 20 MB shared L3 cache. L1 and L2 caches are the same on a per-core basis: 80 KB L1 per core and 1.25 MB L2 per core. Both support DDR4 and DDR5 memory in a dual-channel configuration, with PCIe Gen 4 and 20 CPU-only lanes. Neither supports ECC memory. The i9-12900H has 14 cores and 20 threads, while the i5-12600K has 10 cores and 16 threads, which explains the i9's advantage in certain integer and physics workloads. The i5's Alder Lake-S desktop design pairs a higher base clock with a much higher TDP, which the benchmark results indicate translates into better sustained multi-core performance in most tests despite having fewer cores. The i9's mobile Alder Lake-H design prioritizes power efficiency, yet its higher core count still allows it to win in specific compute-intensive tasks. The integrated graphics difference (Iris Xe 96EU versus UHD Graphics 770) does not appear in the benchmark data, so no performance comparison is possible from the recorded measurements.