Intel Core i9-14900K vs Intel Core Ultra 9 285HX Comparison

The Intel Core i9-14900K and Intel Core Ultra 9 285HX represent two distinct approaches to high-end processing within the same manufacturer's lineup. The i9-14900K is a desktop part built on Raptor Lake, while the Ultra 9 285HX is a mobile processor on Arrow Lake. The recorded data shows both achieve the 95th percentile among all CPUs, but their benchmark profiles diverge significantly. This analysis breaks down the comparison based strictly on the available measurements.

FAQ

Q: Which processor has more threads, the Core i9-14900K or the Core Ultra 9 285HX?

A: The Core i9-14900K has 32 threads from its 24 cores. The Core Ultra 9 285HX also has 24 cores but only 24 threads, meaning it lacks the hyper-threading capability of its counterpart.

Q: What is the difference in their boost clock speeds?

A: The Core i9-14900K has a boost clock of 6.00 GHz, which is higher than the Core Ultra 9 285HX's boost clock of 5.50 GHz.

Q: How do the two processors compare in terms of process node and foundry?

A: The Core i9-14900K uses a 10 nm process from Intel. The Core Ultra 9 285HX uses a 3 nm process from TSMC, representing a significant difference in manufacturing technology.

Q: Which processor has a higher average benchmark score?

A: The Core i9-14900K has an average benchmark score of 79097, while the Core Ultra 9 285HX has an average score of 76155. This puts the i9-14900K ahead by approximately 3.9%.

Q: What is the difference in L1 and L2 cache sizes per core?

A: The Core i9-14900K has 80 KB of L1 and 2 MB of L2 per core. The Core Ultra 9 285HX has larger per-core caches, with 192 KB of L1 and 3 MB of L2.

Q: Which processor wins in the PassMark integer math test?

A: The Core i9-14900K wins decisively in the PassMark integer math test, scoring 210622 compared to the Core Ultra 9 285HX's 155076, a difference of 35.8%.

Where Each One Wins

The Core i9-14900K dominates the majority of the head-to-head benchmarks, securing 12 wins out of 17 recorded tests. Its victories are concentrated in multi-core rendering, single-core performance, and integer-heavy workloads. The data shows a clear advantage in Cinebench tests, where the i9-14900K leads in all six recorded versions, from a slim 0.3% margin in R15 single-core to a substantial 8.2% margin in R23 multi-core.

The Core Ultra 9 285HX claims 5 wins, all in specific PassMark sub-tests. These wins are notable for their magnitude and point to different strengths. It excels in floating-point math, prime number finding, and extended instruction sets. The Ultra 9 285HX also wins in data encryption and physics simulations, suggesting its architecture handles these specific workloads more efficiently despite the overall lower average score.

Architecture Differences

The architectural divide is stark. The Core i9-14900K is built on the Raptor Lake architecture, specifically the Raptor Lake-R refresh, and uses a 10 nm process node fabricated by Intel. In contrast, the Core Ultra 9 285HX uses the Arrow Lake architecture, specifically Arrow Lake-HX, and is built on a 3 nm process node fabricated by TSMC. This process shrink is a fundamental difference, allowing the mobile chip to pack 17,800 million transistors into a 243 mm² die, while the desktop chip's die size is 257 mm² with no transistor count listed.

The cache hierarchies also differ. The Core i9-14900K has 80 KB of L1 cache and 2 MB of L2 cache per core, while the Core Ultra 9 285HX has 192 KB of L1 and 3 MB of L2 per core. Both share 36 MB of L3 cache. The thread counts differ as well: the i9-14900K offers 32 threads from its 24 cores, while the Ultra 9 285HX offers 24 threads from its 24 cores, indicating the latter does not use simultaneous multithreading.

The integrated graphics differ, with the i9-14900K featuring UHD Graphics 770 and the Ultra 9 285HX featuring Arc Xe-LPG Graphics 64EU. Memory support also varies: the i9-14900K supports both DDR4 and DDR5, while the Ultra 9 285HX supports only DDR5. The Ultra 9 285HX has a listed memory bandwidth of 102.4 GB/s, while the i9-14900K's bandwidth is not listed.

Specification Differences

The two processors diverge on nearly every core specification. The Core i9-14900K has a base clock of 3.20 GHz and a boost clock of 6.00 GHz, while the Core Ultra 9 285HX has a base clock of 2.80 GHz and a boost clock of 5.50 GHz. The TDP difference is significant: the i9-14900K has a TDP of 125, while the Ultra 9 285HX has a TDP of 55, reflecting their desktop and mobile design targets.

The sockets are incompatible. The Core i9-14900K uses Intel Socket 1700, while the Core Ultra 9 285HX uses Intel BGA 2114. The PCIe support also differs, with the i9-14900K offering Gen 5 with 16 lanes (CPU only) and the Ultra 9 285HX offering Gen 5 with 20 lanes (CPU only). Both support ECC memory and have unlocked multipliers.

The release dates are distinct: the i9-14900K launched on 2023-10-16, while the Ultra 9 285HX launched on 2025-01-12. The i9-14900K has a launch MSRP of $589, while the Ultra 9 285HX has no listed MSRP. The part numbers are SRN48 for the i9-14900K and SRVFJ for the Ultra 9 285HX.

Head-to-Head Benchmarks

The largest win for the Core i9-14900K comes in PassMark integer math, where it scores 210622 against the Ultra 9 285HX's 155076, a 35.8% advantage. This is a massive gap that highlights the desktop chip's strength in general-purpose integer workloads. The next biggest win is in data compression, where the i9-14900K scores 792694 versus 631885, a 25.4% lead. In Cinebench R23 multi-core, the i9-14900K scores 39399.5 against 36429.5, an 8.2% margin. It also leads in Cinebench R15 multi-core by 7.9% (6103 vs 5656.5) and in random string sorting by 12.7% (86971 vs 77196).

The Core Ultra 9 285HX's largest win is in PassMark find prime numbers, where it scores 460 against the i9-14900K's 231, a 49.8% advantage. This is a remarkable turnaround in a specific computational task. It also wins in floating-point math, scoring 194998 against 152975, a 21.6% lead. In extended instructions, the Ultra 9 285HX scores 49148 versus 45154, an 8.1% advantage. It leads in physics with 3476 versus 3140, a 9.7% margin, and in data encryption with 48567 versus 46813, a 3.6% margin.

In single-core tests, the i9-14900K holds a narrower edge. It wins Cinebench R15 single-core by 0.3% (324.5 vs 323.5), Cinebench R20 single-core by 2.8% (2935 vs 2856), and Cinebench R23 single-core by 3.4% (2262.5 vs 2187.5). PassMark single-thread results show a 1.7% lead for the i9-14900K (4697 vs 4618). The overall PassMark multithread score also favors the i9-14900K, at 58674 versus 56902, a 3.1% difference.

The Verdict

The data points to a clear split based on use case and platform. The Core i9-14900K is the stronger all-around performer for desktop users who prioritize multi-core rendering, general productivity, and single-threaded responsiveness. Its wins in all Cinebench versions, integer math, and data compression make it the obvious choice for workloads that rely on these metrics. The 35.8% lead in integer math is particularly decisive for compilation, scripting, and many content creation tasks.

The Core Ultra 9 285HX, despite being a mobile part, shows superior performance in specific computational areas. Its 49.8% advantage in prime number finding and 21.6% lead in floating-point math suggest it is better suited for scientific computing, financial modeling, or any application that heavily uses floating-point operations. Its wins in encryption and physics also indicate strengths in security-related and simulation workloads.

For a desktop user building a high-end system, the Core i9-14900K is the choice based on its higher average benchmark score of 79097 and its dominance in the majority of tests. For a mobile user who needs a laptop processor with a lower TDP of 55 and specific floating-point strengths, the Core Ultra 9 285HX offers a compelling alternative. The i9-14900K wins 12 of the 17 head-to-head benchmarks, but the Ultra 9 285HX wins the tests where it matters most for certain specialized applications. The decision hinges on whether the user needs the broad multi-core and integer performance of the desktop chip or the specialized floating-point and encryption capabilities of the mobile chip.