Intel Core i9-12900HX vs Intel Core Ultra 9 185H Comparison

The Intel Core Ultra 9 185H and Intel Core i9-12900HX are both 16-core mobile processors from Intel, yet they represent distinctly different design philosophies and generations. The Core Ultra 9 185H, built on the Meteor Lake architecture and a 7 nm process, posts an average benchmark score of 35670, placing it in the 85th percentile of all CPUs. The older Core i9-12900HX, from the Alder Lake-HX family on a 10 nm process, achieves an average score of 35003, sitting in the 84th percentile. Despite the newer architecture and slightly higher average score of the Ultra 9, the head-to-head benchmark data tells a different story: the i9-12900HX wins all 17 comparative tests, with deltas ranging from -1.3% to -22.3%. This page analyzes the architectural differences, specification gaps, and benchmark results that define this matchup.

FAQ

Q: Which processor has a higher boost clock speed?

A: The Intel Core Ultra 9 185H has a boost clock of 5.10 GHz, while the Intel Core i9-12900HX boosts to 5.00 GHz. The Ultra 9 also has a significantly higher base clock of 3.90 GHz compared to the i9's 2.30 GHz.

Q: How do the two CPUs compare in Cinebench R23 multi-core performance?

A: The Core i9-12900HX scores 23150 in Cinebench R23 multi-core, which is 22.3% higher than the Core Ultra 9 185H's score of 17984.5. This is the largest performance gap observed in any benchmark between the two.

Q: Which processor supports ECC memory?

A: The Intel Core i9-12900HX supports ECC memory, while the Intel Core Ultra 9 185H does not. This is a notable feature difference for users requiring error-correcting memory in a mobile platform.

Q: What is the difference in their average benchmark scores?

A: The Core Ultra 9 185H has an average benchmark score of 35670, which is 1.9% higher than the Core i9-12900HX's average score of 35003. However, this aggregate metric does not reflect the results of the direct head-to-head comparisons.

Q: Are both processors unlocked for overclocking?

A: No. The Core i9-12900HX has an unlocked multiplier, making it overclockable, while the Core Ultra 9 185H has a locked multiplier and does not support overclocking.

Q: What is the difference in their L3 cache sizes?

A: The Core i9-12900HX has a larger shared L3 cache of 30 MB, compared to the Core Ultra 9 185H's 24 MB shared L3 cache. The i9 also features larger per-core L1 and L2 caches at 80 KB and 1.25 MB, respectively, versus the Ultra 9's 112 KB L1 and 2 MB L2 per core.

Architecture Differences

The two processors are built on fundamentally different Intel architectures. The Core Ultra 9 185H uses the Meteor Lake architecture, fabricated on a 7 nm process by Intel. In contrast, the Core i9-12900HX uses the older Alder Lake architecture, built on a 10 nm process. This generational shift brings significant changes beyond just the process node. The Ultra 9 features an integrated graphics solution based on Arc Xe-LPG with 128 execution units, which is a substantial upgrade over the UHD Graphics 770 found in the i9-12900HX.

The memory support also differs. The Ultra 9 supports only DDR5 memory, with bandwidth listed at 89.6 GB/s, while the i9-12900HX supports both DDR4 and DDR5, with no specific bandwidth figure provided. The PCIe configurations are notably different: the Ultra 9 offers Gen 5 with 8 lanes (CPU only), whereas the i9-12900HX provides Gen 5 with 20 lanes (CPU only). This gives the older chip significantly more PCIe bandwidth for discrete GPUs and other peripherals.

The production status of both is listed as "Active," but their release dates are separated by roughly 19 months. The i9-12900HX was released on 2022-05-09, while the Ultra 9 185H came later on 2023-12-13. The die size of the i9-12900HX is listed as 215 mm², while no die size is available for the Ultra 9. These architectural differences—process node, iGPU, memory support, and PCIe lanes—create distinct platform characteristics that influence performance and system design.

Head-to-Head Benchmarks

The head-to-head benchmark results are unequivocal: the Intel Core i9-12900HX wins every single one of the 17 comparative tests. The most dramatic victory comes in Cinebench R23 multi-core, where the i9 scores 23150 against the Ultra 9's 17984.5, a 22.3% advantage. Similarly, in Cinebench R15 multi-core, the i9's 3566 score beats the Ultra 9's 2801.5 by 21.4%. These multi-core deltas are the largest in the entire dataset, suggesting the i9's 24 threads (versus the Ultra 9's 22) and higher thermal design power of 55W (compared to 45W) provide a substantial advantage in heavily threaded workloads.

Single-core performance also favors the i9, though by narrower margins. In Cinebench R23 single-core, the i9 scores 1912.5 versus 1810.5 for the Ultra 9, a 5.3% delta. The Cinebench R20 single-core test shows an 11.9% gap (1660 vs 1462), while Cinebench R15 single-core shows a smaller 4.9% difference (278 vs 264.5). PassMark single-thread results are close, with the i9 at 3745 and the Ultra 9 at 3697, a mere 1.3% difference. This pattern indicates the i9 has a consistent, if sometimes modest, edge in lightly threaded scenarios.

The PassMark suite reveals the i9's dominance across various workloads. In integer math, the i9 scores 113416 versus 98302, a 13.3% win. Floating-point math shows a 13.2% advantage (84410 vs 73270). Data compression is 15.3% higher (400636 vs 339489), and data encryption is 13.5% higher (22932 vs 19827). Extended instructions see a 16.6% gap (24315 vs 20272). Even in physics simulation, the i9 wins by 2.8% (2012 vs 1956). The smallest gap in the entire set is in PassMark single-thread at 1.3%, while the largest is in Cinebench R23 multi-core at 22.3%. The i9's wins are consistent across all 17 benchmarks, making it the definitive performance leader in this direct comparison.

Specification Differences

The two processors differ on several key specification fields. The Core Ultra 9 185H has 16 cores and 22 threads, while the Core i9-12900HX has 16 cores and 24 threads. Base clocks differ significantly: 3.90 GHz for the Ultra 9 versus 2.30 GHz for the i9. Boost clocks are closer, at 5.10 GHz and 5.00 GHz, respectively. The thermal design power (TDP) differs, with the Ultra 9 rated at 45W and the i9 at 55W. The socket types are different: Intel BGA 2049 for the Ultra 9 and Intel BGA 1964 for the i9.

Cache configurations vary. The Ultra 9 has 112 KB L1 per core and 2 MB L2 per core, while the i9 has 80 KB L1 and 1.25 MB L2 per core. The shared L3 cache is 24 MB on the Ultra 9 and 30 MB on the i9. Memory support differs: the Ultra 9 supports only DDR5, while the i9 supports both DDR4 and DDR5. The Ultra 9 has a memory bandwidth of 89.6 GB/s, while no figure is listed for the i9. ECC memory support is present on the i9 but absent on the Ultra 9. PCIe lanes differ, with the Ultra 9 offering Gen 5, 8 Lanes (CPU only) versus Gen 5, 20 Lanes (CPU only) for the i9.

Integrated graphics differ substantially: the Ultra 9 features Arc Xe-LPG Graphics 128EU, while the i9 has UHD Graphics 770. The multiplier is unlocked on the i9 but locked on the Ultra 9. The launch MSRP is $640 for the Ultra 9 and $606 for the i9. The process node is 7 nm for the Ultra 9 and 10 nm for the i9. The part numbers are SRN23 for the Ultra 9 and SRLGK for the i9. The i9 has a listed die size of 215 mm², while no die size is available for the Ultra 9.

Where Each One Wins

The Intel Core i9-12900HX wins decisively in raw performance across all benchmark categories. For users prioritizing maximum multi-threaded throughput, the i9's 24 threads and 55W TDP deliver 22.3% higher Cinebench R23 multi-core scores and 21.4% higher R15 multi-core scores. Its 13.3% advantage in integer math and 13.2% in floating-point math make it the clear choice for compute-heavy tasks like video rendering, 3D modeling, and scientific simulations. The i9's larger 30 MB L3 cache and 20 PCIe Gen 5 lanes also provide a platform advantage for high-bandwidth workloads and multi-GPU configurations. Additionally, the i9's unlocked multiplier offers overclocking headroom that the Ultra 9 completely lacks. ECC memory support further positions the i9 for workstation-class reliability.

The Intel Core Ultra 9 185H, despite losing all direct comparisons, has its own merits. Its 7 nm process node and newer Meteor Lake architecture represent a more modern platform. The integrated Arc Xe-LPG Graphics 128EU is significantly more capable than the UHD Graphics 770, making the Ultra 9 a better option for systems that rely on the iGPU for light gaming or media acceleration without a discrete graphics card. The Ultra 9's higher base clock of 3.90 GHz helps in bursty, low-threaded tasks, though the benchmark data shows the i9 still edges it out in single-thread tests by 1.3% to 11.9%. The Ultra 9's lower 45W TDP could also be advantageous in thermally constrained chassis, potentially allowing for quieter or thinner laptop designs. Its 89.6 GB/s memory bandwidth is a listed specification, though the i9's bandwidth is not provided for comparison. In summary, the i9-12900HX is the performance king in this matchup, while the Ultra 9 185H offers a more modern architecture and superior integrated graphics for specific use cases.