Intel Core i9-14900HX vs Intel Core Ultra 5 245K Comparison

The Intel Core i9-14900HX and the Intel Core Ultra 5 245K represent two distinct approaches to modern x86 design, separated by a generation and aimed at entirely different market segments. The data reveals a fascinating split, with the mobile HX part dominating traditional multi-core throughput while the newer desktop Arrow Lake chip counters with superior single-thread and specialized workload performance. The final tally is nearly even, with the i9-14900HX winning 9 of the 17 head-to-head benchmarks and the Ultra 5 245K taking 8, but the margins tell a more nuanced story than the scoreboard suggests.

Head-to-Head Benchmarks

The most decisive victories belong to the Intel Core i9-14900HX in tasks that scale with raw core count. The largest delta is in PassMark integer math, where the i9 posts a score of 157375 against the Ultra 5's 98524, a commanding 59.7% advantage. This pattern repeats in Cinebench R23 multi-core, where the i9 scores 30055 versus 25066, a 19.9% lead, and in Cinebench R15 multi-core, which shows a similar 18.8% gap (4574 vs 3850). Data compression also favors the i9 heavily, with its score of 539965 beating the Ultra 5's 458817 by 17.7%.

The Intel Core Ultra 5 245K, however, wins where the workload is more specialized or latency-sensitive. Its most striking victory is in PassMark find prime numbers, where it scores 414 against the i9's 193—a massive 53.4% difference that suggests a fundamentally more efficient per-core integer pipeline. It also leads in extended instructions (37617 vs 31247, a 16.9% edge), floating-point math (130678 vs 112273, 14.1% ahead), and physics (3081 vs 2638, 14.4% ahead). In single-threaded tests, the Ultra 5 is clearly faster: PassMark single-thread shows 4714 versus 4175, an 11.4% win, and Cinebench R15 single-core shows 322 versus 310.5, a 3.6% edge.

The closer contests reveal how competitive these parts are despite their different designs. Cinebench R20 multi-core is nearly a tie, with the i9 at 15616 and the Ultra 5 at 15368, a mere 1.6% spread. PassMark multi-thread is similarly tight, with the i9's 43778 edging out 43047 by just 1.7%. The i9 also takes Cinebench R20 single-core (2204 vs 2169, 1.6%) and R23 single-core (2181.5 vs 2132, 2.3%), while the Ultra 5 wins data encryption (33286 vs 32619, 2%) and random string sorting goes to the i9 (60861 vs 55098, 10.5%).

Architecture Differences

The foundational difference is the process node and foundry. The i9-14900HX is built on Intel's 10 nm process at Intel's own fabs, using the Raptor Lake architecture with the Raptor Lake-HX refresh codename. The Ultra 5 245K, in contrast, uses TSMC's 3 nm process and the Arrow Lake architecture with the Arrow Lake-S codename. This node advantage is substantial—the 3 nm process allows the Ultra 5 to pack 17,800 million transistors into a 243 mm² die, while the i9's die is slightly larger at 257 mm² but with no transistor count listed.

Core configurations diverge sharply. The i9-14900HX offers 24 cores and 32 threads, a hybrid arrangement that leverages Hyper-Threading. The Ultra 5 245K has only 14 cores and 14 threads, with no Hyper-Threading, reflecting a design philosophy that prioritizes individual core efficiency over thread count. Cache hierarchies also differ: the i9 has 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3, while the Ultra 5 has 192 KB of L1 per core, 3 MB of L2 per core, and a smaller 24 MB of shared L3. The larger per-core L1 and L2 caches on the Ultra 5 likely contribute to its strong single-thread performance.

Clock speeds tell a similar story. The i9 has a base clock of 2.20 GHz but boosts to 5.80 GHz, while the Ultra 5 starts at a much higher 4.20 GHz base but tops out at 5.20 GHz boost. The i9's higher peak frequency helps in multi-core bursts, but the Ultra 5's higher base clock suggests sustained performance at lower power states. Memory support also differs: the i9 supports both DDR4 and DDR5 in dual-channel mode, while the Ultra 5 is DDR5-only but offers a listed memory bandwidth of 102.4 GB/s. The i9 offers 16 PCIe Gen 5 lanes (CPU only), while the Ultra 5 provides 20 Gen 5 lanes.

Where Each One Wins

The Intel Core i9-14900HX is the clear choice for heavily threaded, throughput-oriented workloads. Its 59.7% lead in integer math, 19.9% edge in Cinebench R23 multi-core, and 17.7% advantage in data compression point to a processor that excels when many cores can be kept busy simultaneously. The 10.5% win in random string sorting and 1.7% edge in PassMark multi-thread further cement its role as a multi-core workhorse. This is a mobile chip that behaves like a desktop-class renderer or compiler engine, and its 32 threads give it a structural advantage in any workload that scales with thread count.

The Intel Core Ultra 5 245K wins in scenarios that reward per-core efficiency and modern instruction handling. Its 53.4% blowout in prime number finding is a strong indicator of superior integer execution per clock, while its 16.9% lead in extended instructions suggests better support for AVX-512 or similar advanced instruction sets. The 14.1% win in floating-point math and 14.4% in physics make it attractive for simulation and scientific computing. Its 11.4% single-thread lead in PassMark means everyday responsiveness and lightly threaded applications will feel snappier on the Ultra 5.

Data encryption is a narrow 2% win for the Ultra 5, showing that modern cryptography workloads slightly favor its architecture. The i9, however, counters with wins in Cinebench R20 single-core (1.6%) and R23 single-core (2.3%), suggesting that its high boost clock can still win certain single-threaded races. The overall pattern is clear: the i9 wins by brute force, the Ultra 5 wins by efficiency.

Specification Differences

The two processors diverge on nearly every specification that matters. The i9-14900HX uses the Intel BGA 1964 socket and is a mobile part, while the Ultra 5 245K uses Intel Socket 1851 and is a desktop part. The i9 has a 55W TDP, while the Ultra 5 draws 125W—the latter being a desktop chip with more thermal headroom. The i9 has a base clock of 2.20 GHz and boost of 5.80 GHz, versus the Ultra 5's 4.20 GHz base and 5.20 GHz boost. Core counts are 24 vs 14, threads are 32 vs 14.

The process node is 10 nm for the i9 and 3 nm for the Ultra 5, with the foundry shifting from Intel to TSMC. The Ultra 5 has a listed transistor count of 17,800 million, while the i9's is null; die sizes are 257 mm² vs 243 mm². L1 cache is 80 KB per core on the i9 versus 192 KB per core on the Ultra 5; L2 is 2 MB per core versus 3 MB per core; L3 is 36 MB shared versus 24 MB shared. Memory support is DDR4/DDR5 for the i9, DDR5-only for the Ultra 5, with the latter offering a listed bandwidth of 102.4 GB/s. PCIe lanes are 16 Gen 5 for the i9 and 20 Gen 5 for the Ultra 5. Integrated graphics are UHD Graphics 770 for the i9 and Arc Xe-LPG Graphics 64EU for the Ultra 5. The i9 launched on 2024-01-07, the Ultra 5 on 2024-10-23. The Ultra 5 has a launch MSRP of $319; the i9 has no listed MSRP.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i9-14900HX has 24 cores and 32 threads, while the Intel Core Ultra 5 245K has 14 cores and 14 threads. The i9 also supports Hyper-Threading, which the Ultra 5 does not.

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

A: The largest delta is in PassMark integer math, where the i9-14900HX beats the Ultra 5 245K by 59.7% (157375 vs 98524). The second-largest is in PassMark find prime numbers, where the Ultra 5 wins by 53.4% (414 vs 193).

Q: Which processor has the higher boost clock?

A: The i9-14900HX boosts to 5.80 GHz, while the Ultra 5 245K boosts to 5.20 GHz. However, the Ultra 5 has a higher base clock at 4.20 GHz versus the i9's 2.20 GHz.

Q: Do these processors support ECC memory?

A: Yes, both the i9-14900HX and the Ultra 5 245K list ECC memory support as true.

Q: How many PCIe Gen 5 lanes does each provide?

A: The i9-14900HX provides 16 Gen 5 lanes (CPU only), while the Ultra 5 245K provides 20 Gen 5 lanes (CPU only).

Q: Which processor has a higher average benchmark score?

A: The i9-14900HX has an average benchmark score of 56004 and sits at the 91st percentile, while the Ultra 5 245K has an average score of 54053 and also sits at the 91st percentile. The i9 edges out the Ultra 5 by about 3.6%.

The Verdict

The data points to distinct buyers for each chip. The Intel Core i9-14900HX is for users who need maximum multi-core throughput in a mobile form factor. Its 32 threads and 24 cores deliver a 19.9% lead in Cinebench R23 multi-core and a 59.7% advantage in integer math, making it the pick for heavy rendering, compilation, or data processing on the go. Its 36 MB of L3 cache and boost clock of 5.80 GHz also help it win most Cinebench single-core tests, though by narrow margins.

The Intel Core Ultra 5 245K is for desktop users who value per-core efficiency and modern features. Its 3 nm process, larger per-core caches (192 KB L1, 3 MB L2), and higher base clock of 4.20 GHz translate to a 11.4% single-thread win in PassMark and a 53.4% lead in prime number finding. The 16.9% edge in extended instructions and 14.1% in floating-point math make it superior for scientific or SIMD-heavy workloads. Its 20 PCIe Gen 5 lanes and 102.4 GB/s memory bandwidth also offer more platform headroom.

Choose the i9-14900HX if your work is thread-hungry and you need a mobile solution. Choose the Ultra 5 245K if you want a desktop processor that wins on efficiency, single-thread speed, and specialized instruction handling. Both sit at the 91st percentile, but they achieve that standing through opposite strategies—one through sheer core count, the other through architectural refinement.