Intel Core i9-13900K vs Intel Core Ultra 7 265HX Comparison

Head-to-Head Benchmarks

The head-to-head data splits these two processors into distinct performance territories. The Intel Core i9-13900K wins 12 of the 17 shared benchmark comparisons, while the Intel Core Ultra 7 265HX takes 5. That raw win count, however, obscures the magnitude of the victories. The Ultra 7 265HX dominates in single-core Cinebench workloads with margins that are far larger than anything the i9-13900K manages in its preferred tests.

The most striking result is Cinebench R23 single-core. The Ultra 7 265HX scores 5737 against 2238.5 for the i9-13900K, a 156.3% advantage. This is not a marginal lead; it is a generational leap in single-threaded capability. Cinebench R15 single-core tells a similar story, with the Ultra 7 265HX at 578 versus 318, a 81.8% delta. The i9-13900K does win Cinebench R20 single-core, 2927 to 2409, a 17.7% margin, but that result is an outlier against the broader trend of Ultra 7 superiority in lightly threaded Cinebench tests.

Multi-core Cinebench results are split. Cinebench R15 multicore favors the i9-13900K heavily: 5805.5 to 4096, a 29.4% deficit for the Ultra 7. Cinebench R20 multicore also goes to the i9-13900K, 20740 to 17069, a 17.7% margin. But Cinebench R23 multicore flips the script. The Ultra 7 265HX scores 40642 against 38271.5, a 6.2% win. This suggests the newer architecture scales better under sustained R23 loading despite having fewer threads.

PassMark results are where the i9-13900K builds its overall lead. Data compression is a 35.5% win for the i9-13900K (793645 to 511817). Integer math shows a 38.9% margin (207792 to 126954). Random string sorting goes 87705 to 62458, a 28.8% gap. Multithread performance favors the i9-13900K by 18.1% (58589 to 47985). Data encryption is a 15.3% win (46609 to 39472), extended instructions a 12.3% win (46477 to 40741), and physics a narrower 5.2% win (3140 to 2978).

The Ultra 7 265HX counters with passmark_find_prime_numbers at 406 versus 236, a 72% advantage. Floating point math also goes to the Ultra 7, 161605 to 151562, a 6.6% win. The single-thread PassMark tests are close: the i9-13900K edges ahead 4608 to 4500, a 2.3% margin in both passmark_single_thread and passmark_singlethread.

Overall average benchmark scores place the Ultra 7 265HX at 63173 against 61766 for the i9-13900K. The Ultra 7 sits at the 93rd percentile among all CPUs, while the i9-13900K sits at the 92nd. The nearest rivals for the Ultra 7 include the Intel Core i7-13790F at 63080 (0.1% behind), the AMD Ryzen AI 7 450G at 63331 (0.2% ahead), and the AMD Ryzen AI Embedded P185 at 62839 (0.5% behind). The i9-13900K's nearest rivals include the Intel Core i9-13900T at 61723 (0.1% behind), the Intel Core Ultra 7 270HX Plus at 61834 (0.1% ahead), and the Intel Core i9-13900KF at 61841 (0.1% ahead).

Where Each One Wins

The Intel Core i9-13900K is the choice for throughput-heavy workloads that can exploit its 24 cores and 32 threads. Data compression, integer math, and random string sorting are all areas where it holds decisive double-digit leads. The 35.5% compression advantage and the 38.9% integer math advantage indicate that traditional CPU-bound productivity tasks, particularly those involving large datasets or compilation workloads, will complete noticeably faster on the i9-13900K. Its PassMark multithread score of 58589 versus 47985 reinforces this: the i9-13900K is the stronger general-purpose parallel processor.

The Ultra 7 265HX wins in scenarios that depend on per-core efficiency and modern instruction handling. The 156.3% lead in Cinebench R23 single-core is the defining metric. Any application that is latency-sensitive or poorly threaded will favor the Ultra 7. The 72% win in prime number finding suggests strong integer division and branch prediction performance. Floating point math at 6.6% ahead indicates the Ultra 7 also handles scientific and simulation workloads competitively despite its lower core count.

Cinebench R23 multicore is a notable middle ground. The Ultra 7 wins by 6.2% despite having fewer cores and threads. This indicates that the Arrow Lake architecture extracts more performance per thread under sustained rendering loads, at least in this specific benchmark. Users running Cinebench R23 as their primary render test would prefer the Ultra 7, while users running R15 or R20 would prefer the i9-13900K.

Single-thread PassMark is nearly a tie, with the i9-13900K ahead by only 2.3%. This is the closest benchmark in the entire comparison and suggests that for generic single-threaded office workloads, the two are effectively interchangeable. The i9-13900K also wins physics by 5.2%, a modest margin that keeps it relevant for physics simulation tasks.

Architecture Differences

The two processors come from different Intel design eras. The Ultra 7 265HX uses Arrow Lake architecture, specifically the Arrow Lake-HX codename, built on a 3 nm process at TSMC. The i9-13900K uses Raptor Lake architecture, codename Raptor Lake-S, built on a 10 nm process at Intel's own foundries. This process difference is central to the performance split: the 3 nm node enables higher single-core efficiency, while the 10 nm node allows for a larger, more power-hungry core configuration.

The Ultra 7 265HX has 20 cores and 20 threads, meaning no hyperthreading. The i9-13900K has 24 cores and 32 threads, meaning hyperthreading is active on its efficiency cores. The i9-13900K's additional threads contribute directly to its PassMark multithread and integer math wins. The Ultra 7 compensates with a different cache structure: 192 KB of L1 per core and 3 MB of L2 per core, versus 80 KB of L1 per core and 2 MB of L2 per core on the i9-13900K. The i9-13900K has a larger shared L3 cache at 36 MB versus 30 MB on the Ultra 7.

The Ultra 7 265HX integrates Arc Xe-LPG Graphics with 64 execution units. The i9-13900K integrates UHD Graphics 770. Both processors have unlocked multipliers, so overclocking is possible on either, though the mobile BGA socket of the Ultra 7 limits practical overclocking compared to the desktop LGA 1700 platform.

The i9-13900K supports both DDR4 and DDR5 memory, while the Ultra 7 supports DDR5 only. The i9-13900K also supports ECC memory; the Ultra 7 does not. The Ultra 7 has a higher PCIe lane count for the CPU at 20 Gen 5 lanes versus 16 Gen 5 lanes on the i9-13900K. The Ultra 7's memory bandwidth is listed at 102.4 GB/s, while the i9-13900K has no recorded bandwidth figure in the database.

The transistor counts differ as well. The Ultra 7 265HX has 17,800 million transistors on a 243 mm² die. The i9-13900K has no recorded transistor count but a slightly larger die at 257 mm². This density difference reflects the 3 nm process advantage.

Specification Differences

The core and thread counts are the most obvious divergence. The Ultra 7 265HX offers 20 cores and 20 threads. The i9-13900K offers 24 cores and 32 threads. Base clocks differ: 2.60 GHz for the Ultra 7 versus 3.00 GHz for the i9-13900K. Boost clocks favor the i9-13900K at 5.80 GHz versus 5.30 GHz for the Ultra 7. Thermal design power is dramatically different: 55 W for the Ultra 7 versus 125 W for the i9-13900K.

The sockets are incompatible. The Ultra 7 uses Intel BGA 2114, a mobile socket. The i9-13900K uses Intel Socket 1700, a desktop socket. Market segments reflect this: the Ultra 7 is a mobile processor, the i9-13900K is a desktop processor. The i9-13900K has a recorded launch MSRP of $589. The Ultra 7 has no recorded launch MSRP.

The process node, foundry, and architecture names all differ as described above. The i9-13900K supports both DDR4 and DDR5 memory, while the Ultra 7 supports DDR5 only. ECC memory support exists on the i9-13900K but not on the Ultra 7. The integrated graphics differ: Arc Xe-LPG Graphics 64EU on the Ultra 7, UHD Graphics 770 on the i9-13900K. PCIe lanes differ: 20 Gen 5 lanes on the Ultra 7, 16 Gen 5 lanes on the i9-13900K.

Release dates are separated by over two years. The i9-13900K was released on 2022-09-26. The Ultra 7 265HX was released on 2025-01-12. Both are currently marked as active production. Part numbers are SRVFH for the Ultra 7 and SRMBH for the i9-13900K.

FAQ

Q: Which processor has better single-core performance?

A: The Intel Core Ultra 7 265HX. In Cinebench R23 single-core, it scores 5737 versus 2238.5 for the i9-13900K, a 156.3% advantage. In Cinebench R15 single-core, it leads 578 to 318, an 81.8% margin. The i9-13900K wins Cinebench R20 single-core 2927 to 2409, but the overall single-core picture strongly favors the Ultra 7.

Q: Which processor wins in multi-core workloads?

A: It depends on the benchmark. The i9-13900K wins Cinebench R15 multicore (5805.5 to 4096, a 29.4% lead) and Cinebench R20 multicore (20740 to 17069, a 17.7% lead). The Ultra 7 265HX wins Cinebench R23 multicore (40642 to 38271.5, a 6.2% lead). PassMark multithread favors the i9-13900K at 58589 versus 47985.

Q: How do their thread counts compare?

A: The i9-13900K has 24 cores and 32 threads. The Ultra 7 265HX has 20 cores and 20 threads. The i9-13900K benefits from hyperthreading on its efficiency cores, which contributes to its wins in integer math and data compression.

Q: What is the thermal design power difference?

A: The Ultra 7 265HX has a TDP of 55 W. The i9-13900K has a TDP of 125 W. This makes the Ultra 7 significantly more power-efficient on paper, though the i9-13900K's higher power budget enables higher boost clocks and more sustained multithreaded throughput.

Q: Which processor supports ECC memory?

A: The i9-13900K supports ECC memory. The Ultra 7 265HX does not. The i9-13900K also supports both DDR4 and DDR5 memory, while the Ultra 7 supports DDR5 only.

Q: How do their overall benchmark averages compare?

A: The Ultra 7 265HX has an average benchmark score of 63173, placing it at the 93rd percentile of all CPUs. The i9-13900K has an average benchmark score of 61766, placing it at the 92nd percentile. The Ultra 7's nearest rival is the Intel Core i7-13790F at 63080 (0.1% behind), while the i9-13900K's nearest rival is the Intel Core i9-13900T at 61723 (0.1% behind).

The Verdict

The Intel Core Ultra 7 265HX is the pick for users who prioritize single-core performance and power efficiency. The 156.3% lead in Cinebench R23 single-core is the single largest performance gap in this comparison. Its 55 W TDP, 3 nm process node, and 20 Gen 5 PCIe lanes make it the more modern and portable option. The 6.2% win in Cinebench R23 multicore shows that it can hold its own in at least one major rendering workload despite its lower core count. The 72% win in prime number finding and the 6.6% win in floating point math round out a profile that favors latency-sensitive and efficiency-focused tasks.

The Intel Core i9-13900K is the pick for users who need maximum parallel throughput in traditional desktop workloads. Its 32 threads drive wins in data compression (35.5%), integer math (38.9%), random string sorting (28.8%), and PassMark multithread (18.1%). The 125 W TDP and desktop Socket 1700 platform indicate it is designed for systems where power draw is not a constraint. The 36 MB L3 cache and support for both DDR4 and DDR5 memory give it flexibility in existing desktop builds. Its launch MSRP is $589, and it remains an active production part.

The data does not declare a single winner. The Ultra 7 265HX wins the efficiency and single-core battle while losing the raw multithreaded throughput battle. The i9-13900K wins most shared benchmarks but loses the two most dramatic single-core tests. Users should choose based on workload: the Ultra 7 for modern, single-threaded, power-conscious mobile systems; the i9-13900K for heavily threaded desktop productivity. The 93rd versus 92nd percentile ranking and the close average scores (63173 versus 61766) confirm that these are peers in overall capability, separated by workload type rather than absolute performance.