Intel Core i5-12600K vs Intel Core Ultra 5 125H Comparison

The Intel Core i5-12600K and Intel Core Ultra 5 125H represent two distinct approaches to processor design from the same manufacturer, targeting different market segments with different priorities. The data shows a clear performance hierarchy between the two, with the desktop-oriented i5-12600K winning all 17 head-to-head benchmark comparisons against the mobile-focused Ultra 5 125H. Despite the Ultra 5 125H having more cores and threads, the i5-12600K consistently delivers higher scores across every tested workload, from single-threaded tasks to heavily multithreaded rendering. This analysis walks through the architectural foundations, benchmark results, and practical implications of these differences.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core Ultra 5 125H has 14 cores and 18 threads, while the Intel Core i5-12600K has 10 cores and 16 threads. Despite having fewer cores, the i5-12600K wins all 17 head-to-head benchmarks.

Q: How large is the performance gap in multi-core workloads?

A: The i5-12600K leads by 36.6% in Cinebench R23 multi-core (17491 vs 12804.5) and by 37.1% in Cinebench R20 multi-core (9821 vs 7161). The PassMark multithread test shows a 30.8% advantage for the i5-12600K (27608 vs 21100).

Q: What are the single-thread performance differences?

A: The i5-12600K wins single-thread tests by margins ranging from 14.1% in Cinebench R15 (275 vs 241) to 15.8% in Cinebench R23 (1907 vs 1647.5). PassMark single-thread shows a 15.5% lead (3926 vs 3399).

Q: How do the integrated graphics compare?

A: The i5-12600K features UHD Graphics 770, while the Ultra 5 125H includes Arc Xe-LPG 96EU. The FACT PACK does not provide benchmark scores for either integrated GPU, so no performance comparison can be made from this data.

Q: What are the power and platform differences?

A: The i5-12600K has a TDP of 125W and uses Intel Socket 1700, while the Ultra 5 125H has a 28W TDP and uses Intel BGA 2049. The i5-12600K supports DDR4 and DDR5 memory, while the Ultra 5 125H supports DDR5 with memory depending on the motherboard.

Q: Which processor has a higher boost clock?

A: The i5-12600K has a boost clock of 4.90 GHz, compared to 4.50 GHz for the Ultra 5 125H. The base clocks are 3.70 GHz and 3.60 GHz respectively.

Architecture Differences

The architectural divide between these two processors is substantial, reflecting their different design goals. The i5-12600K uses the Alder Lake architecture on a 10 nm process node, while the Ultra 5 125H employs the Meteor Lake architecture on a 7 nm process node. Both are manufactured by Intel, but the die sizes differ significantly: the i5-12600K has a die size of 215 mm², while the Ultra 5 125H does not have a listed die size in the data.

The core configurations reveal a key strategic difference. The i5-12600K has 10 cores and 16 threads, while the Ultra 5 125H has 14 cores and 18 threads. However, the i5-12600K compensates with higher clock speeds: a base clock of 3.70 GHz and boost clock of 4.90 GHz, compared to 3.60 GHz base and 4.50 GHz boost for the Ultra 5 125H. The cache hierarchies also differ, with the i5-12600K providing 80 KB of L1 cache per core, 1.25 MB of L2 cache per core, and 20 MB of shared L3 cache. The Ultra 5 125H offers larger per-core caches at 112 KB L1 and 2 MB L2, but a smaller 18 MB shared L3 cache.

Memory support and PCIe capabilities further differentiate the two. The i5-12600K supports both DDR4 and DDR5 memory in a dual-channel configuration, while the Ultra 5 125H supports DDR5 with the specific memory depending on the motherboard. The Ultra 5 125H has a listed memory bandwidth of 89.6 GB/s, while the i5-12600K does not have a memory bandwidth figure in the data. For PCIe, the i5-12600K uses Gen 4 with 20 lanes (CPU only), while the Ultra 5 125H uses Gen 5. Neither processor supports ECC memory.

The production status for both is active, and both are from Intel, but their market segments are entirely different: the i5-12600K is a Desktop processor, while the Ultra 5 125H is Mobile. The i5-12600K has an unlocked multiplier, while the Ultra 5 125H does not. The release dates also differ, with the i5-12600K released on 2021-11-03 and the Ultra 5 125H released on 2023-12-13.

Head-to-Head Benchmarks

The benchmark data presents a one-sided picture, with the i5-12600K winning all 17 head-to-head comparisons. The largest margins appear in PassMark extended instructions, where the i5-12600K scores 22002 against 13749 for the Ultra 5 125H, a 60% advantage. This suggests a major difference in handling advanced instruction sets. Data compression also shows a wide gap: the i5-12600K scores 344071 versus 236209, a 45.7% lead.

Cinebench results reinforce the pattern. In Cinebench R20 multi-core, the i5-12600K achieves 9821 against 7161, a 37.1% difference. The single-core Cinebench R20 result is even more pronounced at 37.2% (1386 vs 1010). Cinebench R23 multi-core shows a 36.6% lead (17491 vs 12804.5), while the single-core version shows a 15.8% advantage (1907 vs 1647.5). The older Cinebench R15 tests show a 26.4% multi-core lead (2555 vs 2021.5) and a 14.1% single-core lead (275 vs 241).

PassMark tests show consistent i5-12600K advantages across various workloads. Floating point math scores 67217 versus 51670, a 30.1% lead, while integer math shows 87776 versus 69986, a 25.4% advantage. The multithread test shows 27608 versus 21100, a 30.8% lead. Random string sorting shows 35704 versus 27435, also a 30.1% advantage. Data encryption shows 18485 versus 14251, a 29.7% lead.

The narrowest margins appear in prime number finding, where the i5-12600K scores 91 versus 88, a 3.4% lead, and in physics, where it scores 1525 versus 1439, a 6% advantage. These smaller gaps suggest that the Ultra 5 125H is comparatively more competitive in these specific workloads, though it still loses. The overall average benchmark scores are extremely close: the i5-12600K averages 27578, while the Ultra 5 125H averages 27507, a difference of only 0.3% according to the nearestRivals data.

The Verdict

The data unequivocally favors the Intel Core i5-12600K across every benchmark category measured. With 17 wins out of 17 head-to-head comparisons, the i5-12600K demonstrates superior performance in both single-threaded and multi-threaded workloads. The margins are substantial in most tests, often exceeding 30%, and the only tests where the Ultra 5 125H comes close are prime number finding (3.4% gap) and physics (6% gap).

The i5-12600K’s advantages stem from its higher clock speeds (4.90 GHz boost vs 4.50 GHz) and likely its desktop-oriented design with a 125W TDP, compared to the Ultra 5 125H’s 28W mobile-focused TDP. The Ultra 5 125H does offer more cores (14 vs 10) and threads (18 vs 16), but this does not translate into a performance advantage in any tested benchmark.

The Ultra 5 125H does have a newer architecture (Meteor Lake on 7 nm vs Alder Lake on 10 nm) and a newer release date (2023-12-13 vs 2021-11-03), but the data shows no performance benefit from these factors. The i5-12600K also offers an unlocked multiplier for overclocking, while the Ultra 5 125H is locked. For any user prioritizing raw performance, the i5-12600K is the clear choice based on this data.

Specification Differences

The two processors differ in nearly every specification category. The i5-12600K has 10 cores and 16 threads, while the Ultra 5 125H has 14 cores and 18 threads. The i5-12600K has a base clock of 3.70 GHz and boost clock of 4.90 GHz, while the Ultra 5 125H has 3.60 GHz base and 4.50 GHz boost. The i5-12600K has a TDP of 125W, while the Ultra 5 125H has 28W.

The sockets are incompatible: the i5-12600K uses Intel Socket 1700, while the Ultra 5 125H uses Intel BGA 2049. The architecture differs (Alder Lake vs Meteor Lake), as does the process node (10 nm vs 7 nm). The die size is 215 mm² for the i5-12600K, with no die size listed for the Ultra 5 125H. Cache configurations differ: the i5-12600K has 80 KB L1 per core, 1.25 MB L2 per core, and 20 MB shared L3, while the Ultra 5 125H has 112 KB L1 per core, 2 MB L2 per core, and 18 MB shared L3.

Memory support differs: the i5-12600K supports DDR4 and DDR5, while the Ultra 5 125H supports DDR5 with the memory depending on the motherboard. The Ultra 5 125H has a listed memory bandwidth of 89.6 GB/s, while the i5-12600K does not. PCIe versions differ: Gen 4 with 20 lanes for the i5-12600K versus Gen 5 for the Ultra 5 125H. Integrated graphics are UHD Graphics 770 for the i5-12600K and Arc Xe-LPG 96EU for the Ultra 5 125H. The market segment is Desktop for the i5-12600K and Mobile for the Ultra 5 125H. The i5-12600K has an unlocked multiplier, while the Ultra 5 125H does not. Release dates are 2021-11-03 for the i5-12600K and 2023-12-13 for the Ultra 5 125H.

Where Each One Wins

The i5-12600K wins in every benchmark category measured, making it the superior choice for performance-oriented tasks. The largest advantages appear in extended instructions (60% lead), data compression (45.7% lead), and multi-core Cinebench tests (36.6-37.1% leads). These results suggest the i5-12600K is particularly strong for content creation, scientific computing, and any workload that leverages advanced instruction sets or heavy parallel processing.

The i5-12600K also shows strong single-thread performance with 14.1-15.8% leads across Cinebench versions and a 15.5% lead in PassMark single-thread. This makes it well-suited for everyday applications, gaming, and productivity tasks that rely on single-core performance. The unlocked multiplier is an additional advantage for enthusiasts who want to push performance further.

The Ultra 5 125H, despite losing all benchmarks, still has a role based on its specifications. With a 28W TDP, it is designed for mobile platforms where power efficiency is critical. The 14 cores and 18 threads provide a high core count for a mobile processor, and the Arc Xe-LPG 96EU integrated graphics may offer better visual performance than the UHD Graphics 770, though no benchmark data confirms this. The Gen 5 PCIe support and 89.6 GB/s memory bandwidth are forward-looking specifications. For users who need a mobile processor with high core counts and modern features, the Ultra 5 125H has merit, but for pure performance, the i5-12600K is the definitive winner based on the data.