Intel Core Ultra 7 366H vs Intel Core Ultra 9 285 Comparison

The Intel Core Ultra 7 366H and the Intel Core Ultra 9 285 represent two distinct approaches within Intel’s current mobile and desktop lineups. The 366H is a mobile processor built on the Panther Lake architecture, while the 285 is a desktop processor based on Arrow Lake. The database shows a consistent performance gap across all recorded benchmarks, with the desktop part taking every single head-to-head victory. This analysis walks through the recorded measurements, architectural differences, and specification gaps to clarify what the data indicates about each processor.

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the Intel Core Ultra 9 285 across all 17 head-to-head benchmark comparisons. The largest margin appears in the PassMark integer math test, where the 285 scores 164869 against the 366H’s 83695, a difference of 49.2 percent. Floating point math follows closely, with the 285 at 194988 and the 366H at 103615, a 46.9 percent gap. The random string sorting test shows a 45.9 percent difference, with scores of 73651 and 39814 respectively. Data compression also favors the 285 by a wide margin: 602121 versus 327455, a 45.6 percent difference.

Cinebench results follow the same pattern. In Cinebench R23 multicore, the 285 scores 48945 while the 366H scores 28477, a 41.8 percent difference. The single-core Cinebench R23 result shows the 285 at 6909 and the 366H at 4020, also a 41.8 percent gap. The same delta appears across Cinebench R15 and R20, both multicore and single-core variants. The consistency of that 41.8 percent figure across all six Cinebench tests suggests a stable architectural advantage rather than a workload-specific edge.

PassMark multithread shows the 285 at 56602 against the 366H’s 33429, a 40.9 percent difference. Extended instructions show a 40.7 percent gap, with scores of 45357 and 26901. Data encryption shows a 45 percent difference, 46949 versus 25845. The smallest margins appear in PassMark physics, where the 285 leads 3598 to 2880, a 20 percent difference, and PassMark single thread, where the 285 leads 4881 to 4043, a 17.2 percent difference. Find prime numbers shows a 29 percent gap, 459 versus 326.

The overall average benchmark score reinforces this picture. The 285 sits at 75488, while the 366H sits at 41263. The 285 lands in the 95th percentile of all CPUs in the database, while the 366H lands in the 87th percentile. The nearest rival data for the 285 includes the AMD EPYC 8224P at 75582, just 0.1 percent above, and the AMD Ryzen 7 PRO 9755 at 75738, 0.3 percent above. The 366H’s nearest rivals are much closer in absolute terms: the Intel Core Ultra 7 356H at 41215, just 0.1 percent behind, and the AMD Ryzen 9 5900X at 41376, 0.3 percent ahead. This places the 366H in a competitive mobile segment while the 285 operates in a higher performance tier altogether.

FAQ

Q: Which processor wins in single-core performance?

A: The Intel Core Ultra 9 285 wins all single-core tests. In Cinebench R23 single-core it scores 6909 against the 366H’s 4020, a 41.8 percent difference. In PassMark single thread it scores 4881 against 4043, a 17.2 percent difference.

Q: How large is the multicore gap?

A: The 285 leads by 41.8 percent in Cinebench R23 multicore, scoring 48945 versus 28477. In PassMark multithread the gap is 40.9 percent, with scores of 56602 and 33429.

Q: What is the average benchmark score difference?

A: The 285 has an average benchmark score of 75488, while the 366H has 41263. The 285 sits in the 95th percentile of all CPUs, while the 366H sits in the 87th percentile.

Q: Does the 366H win any benchmark?

A: No. The recorded head-to-head data shows 17 wins for the 285 and zero wins for the 366H.

Q: How does the 366H compare to its own nearest rivals?

A: The 366H is nearly even with the Intel Core Ultra 7 356H, which scores 41215, a 0.1 percent difference. The AMD Ryzen 9 5900X scores 41376, 0.3 percent higher.

Q: How does the 285 compare to its nearest rivals?

A: The 285 is within 0.3 percent of the AMD EPYC 8224P, AMD EPYC 4545P, AMD Ryzen 7 PRO 9755X3D, and AMD Ryzen 7 PRO 9755, with all four rivals falling within a narrow band around 75488.

Architecture Differences

The two processors come from different architectural lineages. The Intel Core Ultra 7 366H uses the Panther Lake architecture, part of the Core Ultra Series 3, and is built on a 3 nm process node at Intel. The Intel Core Ultra 9 285 uses the Arrow Lake architecture, part of the Core Ultra Series 2, and is built on a 3 nm process node at TSMC. Both use 3 nm manufacturing, but the foundry differs, which can influence design choices and transistor characteristics.

The 366H has 16 cores and 16 threads, while the 285 has 24 cores and 24 threads. Neither processor uses simultaneous multithreading, so thread counts equal core counts. The 285 has a larger L3 cache at 36 MB shared, compared to 18 MB shared on the 366H. L2 cache also differs: the 366H has 2.5 MB per core, while the 285 has 3 MB per core. L1 cache is identical at 192 KB per core.

The 366H is a mobile part with a 25 watt TDP and an Intel BGA 2540 socket, while the 285 is a desktop part with a 65 watt TDP and an Intel Socket 1851. The 366H uses Intel Xe3 Graphics as its integrated GPU, while the 285 uses Arc Xe-LPG Graphics with 64 execution units. Memory support differs as well: the 366H supports DDR5 and LPDDR5X, while the 285 supports DDR5 only. The 366H does not support ECC memory, while the 285 does.

PCIe lane counts differ. The 366H provides Gen 5 with 12 lanes from the CPU, while the 285 provides Gen 5 with 20 lanes. Memory bandwidth also differs, with the 366H at 115.2 GB/s and the 285 at 102.4 GB/s, both on dual-channel memory buses. The 285 has a documented transistor count of 17,800 million and a die size of 243 mm², while the database does not list transistor or die size data for the 366H.

Specification Differences

The specification differences between the two processors are substantial. The 366H has 16 cores and 16 threads, while the 285 has 24 cores and 24 threads. Base clocks differ: the 366H runs at 2.00 GHz, while the 285 runs at 2.50 GHz. Boost clocks also differ: the 366H reaches 4.80 GHz, while the 285 reaches 5.60 GHz. TDP is a major separator, with the 366H at 25 watts and the 285 at 65 watts.

The 366H uses the Intel BGA 2540 socket, a mobile package, while the 285 uses Intel Socket 1851, a desktop socket. The 366H belongs to the Core Ultra Series 3, while the 285 belongs to the Core Ultra Series 2. The 366H is part of the Panther Lake-H generation, while the 285 is part of the Arrow Lake generation. The 366H is fabricated at Intel, while the 285 is fabricated at TSMC.

Cache configurations differ. The 366H has 2.5 MB of L2 per core and 18 MB of shared L3. The 285 has 3 MB of L2 per core and 36 MB of shared L3. Memory support differs: the 366H supports DDR5 and LPDDR5X, while the 285 supports DDR5 only. Memory bandwidth is higher on the 366H at 115.2 GB/s, compared to 102.4 GB/s on the 285. ECC support is present on the 285 but absent on the 366H.

The PCIe configuration differs, with 12 CPU lanes on the 366H and 20 on the 285, both Gen 5. The integrated graphics differ, with the 366H using Intel Xe3 Graphics and the 285 using Arc Xe-LPG Graphics with 64 execution units. The 285 has a launch MSRP of $579. The release dates differ, with the 366H released in January 2026 and the 285 released in December 2024. Both processors are listed as active production parts, and neither has an unlocked multiplier.

The Verdict

The recorded data points to a clear performance hierarchy. The Intel Core Ultra 9 285 wins every single benchmark in the head-to-head comparison, with margins ranging from 17.2 percent in PassMark single thread to 49.2 percent in PassMark integer math. The average benchmark score of 75488 versus 41263 places the two processors in different performance classes. The 285 sits in the 95th percentile of all CPUs, while the 366H sits in the 87th percentile.

The 285 is the stronger processor for raw compute. It doubles the core count from 16 to 24, offers a higher boost clock of 5.60 GHz versus 4.80 GHz, and carries double the L3 cache at 36 MB versus 18 MB. The Cinebench results show a consistent 41.8 percent advantage across all tested versions, indicating that the gap is structural rather than workload-dependent. The PassMark results show even larger gaps in integer math, floating point math, data compression, and random string sorting, all exceeding 45 percent.

The 366H is not without its own characteristics. It operates at a much lower TDP of 25 watts versus 65 watts, which suits a mobile form factor. It supports LPDDR5X memory, which the 285 does not, and it has a higher memory bandwidth of 115.2 GB/s versus 102.4 GB/s. Its integrated graphics are listed as Intel Xe3 Graphics, a newer generation designation than the Arc Xe-LPG Graphics on the 285. For a mobile processor, the 366H delivers competitive scores against its nearest rivals, sitting within 0.3 percent of the AMD Ryzen 9 5900X and within 0.1 percent of the Intel Core Ultra 7 356H.

Where Each One Wins

The Intel Core Ultra 9 285 wins in every measured performance category. The largest advantages appear in integer math, where it leads by 49.2 percent, and floating point math, where it leads by 46.9 percent. Data compression and random string sorting both show gaps above 45 percent. Data encryption shows a 45 percent gap. Cinebench multicore and single-core tests all show a 41.8 percent gap. PassMark multithread shows a 40.9 percent gap, and extended instructions show a 40.7 percent gap. The smallest advantages are in physics at 20 percent, single thread at 17.2 percent, and find prime numbers at 29 percent.

The Intel Core Ultra 7 366H does not win any benchmark, but it does offer attributes that matter outside raw throughput. Its 25 watt TDP indicates a power profile suited to mobile systems, while the 285’s 65 watt TDP indicates a desktop-oriented design. The 366H supports LPDDR5X memory, which is typical for mobile platforms, and its memory bandwidth of 115.2 GB/s is actually higher than the 285’s 102.4 GB/s. The 366H also uses a newer integrated GPU generation, Intel Xe3 Graphics, compared to the Arc Xe-LPG Graphics on the 285.

The choice between the two depends on the platform. For desktop workloads where power and cooling are not constraints, the 285 offers substantially higher scores across every recorded test. For mobile workloads where the 25 watt TDP and BGA socket define the system design, the 366H is the only one of the two that fits, and its benchmark scores place it competitively within the mobile segment. The data does not show a scenario where the 366H outpaces the 285, but it does show a mobile processor that holds its own against desktop parts from the previous generation, such as the AMD Ryzen 9 5900X.