Intel Core Ultra 7 165H vs Intel Core Ultra 7 255H Comparison

Head-to-Head Benchmarks

The benchmark database pits the Intel Core Ultra 7 165H against the Intel Core Ultra 7 255H across 17 recorded tests. The results split decisively: the 165H wins 6 tests, while the 255H takes 11. The overall average benchmark scores are close, with the 165H at 34083 and the 255H at 33537, a margin of roughly 1.6%. Yet the distribution of wins tells a more complex story than the aggregate suggests.

The most dramatic difference appears in Cinebench multi-core workloads. The 165H dominates these tests with staggering margins. In Cinebench R15 multi-core, the 165H scores 2641 against the 255H's 1515, a 74.3% advantage. The gap narrows somewhat in R20 multi-core, where the 165H posts 9233 versus 6381, a 44.7% lead. In R23 multi-core, the 165H reaches 14551 while the 255H manages 9240, a 57.5% gap. These are not marginal differences; they indicate a fundamental divergence in how the two processors handle heavily threaded rendering workloads.

Single-core Cinebench results flip the narrative. The 165H wins R15 single-core narrowly, 257 to 251, a 2.4% edge. It also wins R20 single-core by a larger margin, 1303 to 900, a 44.8% difference. However, in R23 single-core, the 255H takes the lead with 1843 against 1759, a 4.6% advantage. The inconsistency across Cinebench versions suggests the two chips respond differently to workload scaling.

PassMark tests reveal the 255H's strengths. In data encryption, the 255H scores 23395 versus 17169, a 26.6% lead. Extended instructions show a 27.2% advantage for the 255H, 23755 to 17299. The largest single-test win for either chip comes in find prime numbers, where the 255H scores 303 against the 165H's 118, a 61.1% margin. Floating point math also favors the 255H heavily: 98796 versus 66273, a 32.9% gap.

The 165H retains some PassMark victories. Integer math goes to the 165H at 89415 versus 77975, a 14.7% lead. Data compression slightly favors the 255H, 298850 to 291161, a 2.6% edge. Random string sorting goes to the 255H, 36058 to 33473, a 7.2% margin. PassMark multi-thread scores show the 255H ahead at 30703 versus 25933, a 15.5% advantage, while physics simulation favors the 255H at 2254 versus 1806, a 19.9% gap.

Where Each One Wins

The 165H is the clear choice for Cinebench-based rendering workloads. Its multi-core scores in R15, R20, and R23 are consistently and substantially higher, with margins ranging from 44.7% to 74.3%. For users running CPU-bound 3D rendering, video encoding, or other tasks that scale across the full processor, the data shows a decisive advantage for the 165H.

The 255H wins in single-threaded PassMark tests. Its single-thread score of 4317 compared to 3509 represents an 18.7% improvement. This translates to better responsiveness in lightly threaded applications, such as web browsing, office productivity, and older games that rely on a single core. The higher boost clock of 5.10 GHz versus 5.00 GHz likely contributes to this edge, though the data alone confirms the result.

For security and encryption workloads, the 255H shows a clear lead. Data encryption scores are 26.6% higher, and extended instructions are 27.2% higher. The find prime numbers test, often used to stress integer arithmetic and branch prediction, shows the 255H at 303 versus 118, a 61.1% advantage. This suggests the 255H handles certain algorithmic workloads far more efficiently.

The 255H also wins in general multi-threaded PassMark scenarios. Its multi-thread score of 30703 against 25933 gives a 15.5% edge, despite the 165H's dominance in Cinebench. This divergence indicates that PassMark's multi-thread workload does not scale the same way as Cinebench's rendering pipeline. Physics simulation follows the same pattern, with the 255H ahead by 19.9%.

The 165H holds a notable win in integer math, scoring 14.7% higher. This test measures raw integer arithmetic throughput, and the 165H's higher base clock of 3.80 GHz versus 2.00 GHz may play a role. Users focused on integer-heavy calculations, such as certain scientific simulations or data processing, would see better results from the 165H.

Architecture Differences

The two processors come from different Intel generations and foundries. The 165H uses Meteor Lake architecture, built on Intel's 7 nm process node. The 255H uses Arrow Lake architecture, manufactured by TSMC on a 3 nm node. This process shrink likely explains some of the 255H's efficiency gains, though the benchmark data does not directly measure power consumption.

Core and thread counts differ significantly. Both have 16 cores, but the 165H supports 22 threads while the 255H supports 16 threads. The 165H's additional threads come from hyper-threading, which the 255H does not appear to enable. This explains the 165H's massive lead in Cinebench multi-core tests, as those workloads benefit from additional threads.

Cache hierarchies differ between the two. The 165H has 112 KB of L1 cache per core, 2 MB of L2 cache per core, and 24 MB of shared L3 cache. The 255H has larger per-core caches: 192 KB of L1 and 3 MB of L2, with the same 24 MB of shared L3. The larger L1 and L2 caches on the 255H help explain its strong PassMark single-thread and algorithmic performance.

Clock speeds show a stark contrast. The 165H has a base clock of 3.80 GHz and a boost clock of 5.00 GHz. The 255H has a much lower base clock of 2.00 GHz but a slightly higher boost clock of 5.10 GHz. The lower base clock on the 255H likely contributes to its lower multi-core Cinebench scores, as all-core sustained workloads may not reach the same frequencies as the 165H.

Memory support differs in scope. The 165H supports DDR5 with capacity depending on the motherboard, while the 255H supports both DDR5 and LPDDR5X. Memory bandwidth is higher on the 255H at 102.4 GB/s versus 89.6 GB/s. The 255H also supports ECC memory, which the 165H does not. Both use dual-channel memory buses.

PCI Express connectivity is a major differentiator. The 165H offers Gen 5 with 8 lanes, while the 255H offers Gen 5 with 20 lanes. This gives the 255H substantially more bandwidth for GPUs and NVMe storage, though the benchmark data does not measure I/O performance directly.

Integrated graphics differ as well. The 165H uses Arc Xe-LPG with 128 execution units, while the 255H uses Arc Graphics 140T. The benchmark data does not include GPU-specific tests, so relative graphics performance cannot be assessed from these numbers.

FAQ

Q: Which processor is faster in Cinebench multi-core tests?

A: The Intel Core Ultra 7 165H wins decisively. It leads by 74.3% in R15 multi-core, 44.7% in R20 multi-core, and 57.5% in R23 multi-core.

Q: Does the 255H win any single-core tests?

A: Yes. The 255H wins Cinebench R23 single-core with 1843 against 1759, a 4.6% edge. It also wins PassMark single-thread with 4317 versus 3509, an 18.7% advantage.

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

A: The largest margin is in Cinebench R15 multi-core, where the 165H scores 2641 versus the 255H's 1515, a 74.3% difference. The second largest is in PassMark find prime numbers, where the 255H leads by 61.1%.

Q: How do their average benchmark scores compare?

A: The 165H has an average benchmark score of 34083, while the 255H averages 33537. The 165H is roughly 1.6% higher on average, despite losing more individual tests.

Q: Which processor has better memory bandwidth?

A: The 255H has higher memory bandwidth at 102.4 GB/s, compared to the 165H's 89.6 GB/s. The 255H also supports LPDDR5X memory in addition to DDR5.

Q: Do both processors have the same number of cores?

A: Yes, both have 16 cores. However, the 165H supports 22 threads while the 255H supports 16 threads, indicating the 165H enables hyper-threading.

The Verdict

The data paints a clear picture for specific use cases. The Intel Core Ultra 7 165H is the superior choice for heavily threaded rendering workloads. Its Cinebench multi-core scores are 44.7% to 74.3% higher across all three versions tested. Any user whose primary workload involves CPU rendering, video encoding, or other tasks that scale with thread count should select the 165H without hesitation.

The Intel Core Ultra 7 255H wins the majority of individual tests, 11 out of 17, but its wins are concentrated in areas that may matter less for typical heavy workloads. It excels in single-threaded performance, encryption, extended instructions, and algorithmic tasks like prime number finding. The 255H also leads in PassMark multi-thread despite losing Cinebench multi-core, indicating its strengths in mixed or parallel integer workloads.

For general productivity and everyday use, the 255H's 18.7% single-thread advantage makes it the better choice. Its higher boost clock of 5.10 GHz and larger per-core caches contribute to snappier performance in applications that do not fully utilize all cores. The 255H also offers ECC memory support and significantly more PCIe lanes, 20 versus 8, making it more versatile for professional workstations.

The 165H's higher base clock of 3.80 GHz versus 2.00 GHz helps it maintain strong performance in sustained all-core workloads. Its 22 threads provide a substantial advantage in thread-scalable applications. Users who prioritize raw multi-threaded throughput should ignore the 255H's higher win count and focus on the Cinebench results.

The overall average benchmark scores are nearly identical, with the 165H at 34083 and the 255H at 33537. The 165H also holds a slightly higher percentile ranking at 84 versus 83 for the 255H. These aggregate figures suggest the processors are broadly comparable in overall performance, with the choice depending on workload profile.

Specification Differences

The two processors differ in several key specifications. The 165H belongs to Core Ultra Series 1 with Meteor Lake architecture, while the 255H belongs to Core Ultra Series 2 with Arrow Lake architecture. The 165H uses Intel's 7 nm process, while the 255H uses TSMC's 3 nm process.

Core counts match at 16, but thread counts differ: the 165H has 22 threads, the 255H has 16. Base clocks are 3.80 GHz for the 165H and 2.00 GHz for the 255H. Boost clocks are 5.00 GHz and 5.10 GHz respectively.

Cache sizes differ per core. The 165H has 112 KB L1 and 2 MB L2 per core. The 255H has 192 KB L1 and 3 MB L2 per core. Both share 24 MB L3 cache.

Memory support differs. The 165H supports DDR5 with motherboard-dependent capacity. The 255H supports DDR5 and LPDDR5X. Memory bandwidth is 89.6 GB/s for the 165H and 102.4 GB/s for the 255H. ECC memory is supported only on the 255H.

PCIe connectivity differs significantly. The 165H offers Gen 5 with 8 lanes, while the 255H offers Gen 5 with 20 lanes. Integrated graphics are Arc Xe-LPG 128EU for the 165H and Arc Graphics 140T for the 255H.

Release dates differ by over a year. The 165H launched on December 13, 2023, while the 255H launched on January 12, 2025. The 165H has a launch MSRP of $460; no launch MSRP is recorded for the 255H. Both use Intel BGA 2049 sockets and are currently active in production.