Intel Core Ultra 7 356H vs Intel Core Ultra 7 366H Comparison

The Intel Core Ultra 7 366H and the Intel Core Ultra 7 356H are two nearly identical Panther Lake-H mobile processors that present a fascinating case of benchmark inconsistency. Both chips share the same core count, cache layout, process node, and even the same 25W TDP, yet the data reveals a split personality: the 366H dominates in some Cinebench tests while the 356H wins the majority of head-to-head matchups. With a combined 17 benchmark comparisons, the 356H takes 12 wins against the 366H’s 5, but the magnitude of those wins varies wildly, making the “better” chip entirely workload-dependent.

Head-to-Head Benchmarks

The most dramatic divergence between these two processors appears in Cinebench R23, where the Intel Core Ultra 7 366H delivers a crushing blow. In the multi-core test, the 366H scores 28,477 against the 356H’s 18,395, a staggering 54.8% advantage. The single-core R23 result is even more lopsided: 4,020 versus 2,040, a 97.1% delta that nearly doubles the 356H’s output. These are not marginal gains; they represent a fundamental performance chasm in this specific workload, suggesting the 366H is capable of sustaining significantly higher clocks or better power delivery under the R23 test conditions.

However, the narrative flips entirely in the older Cinebench R15 and R20 tests. The 356H wins R15 multi-core with a score of 3,055 versus 2,870 (a 6.1% gap), and it also takes R20 multi-core at 12,153 versus 11,960 (1.6% ahead). Even in R20 single-core, the 356H edges out a win with 1,715 versus 1,688, a 1.6% margin. This inconsistency is striking: the same two silicon dies produce opposite results depending on the Cinebench version, likely due to differences in how each test scales with thread scheduling, cache utilization, or power management.

In the Passmark suite, the 356H establishes a more consistent, though narrow, lead across most workloads. Data compression favors the 356H at 336,177 versus 327,455 (2.6% ahead), data encryption goes to the 356H at 26,345 versus 25,845 (1.9%), and extended instructions show the 356H winning at 27,898 versus 26,901 (3.6%). The 356H also takes random string sorting (40,990 vs. 39,814, a 2.9% edge), physics (2,895 vs. 2,880, 0.5%), and the Passmark multi-thread test (33,978 vs. 33,429, 1.6%). Even the single-thread Passmark result goes narrowly to the 356H at 4,072 versus 4,043, a 0.7% difference.

The 366H does manage to claw back wins in a few Passmark sub-tests, though by far smaller margins. Floating point math goes to the 366H at 103,615 versus 103,128 (0.5%), and integer math to the 366H at 83,695 versus 83,111 (0.7%). The find prime numbers test is essentially a tie, with the 356H winning at 327 versus 326 (0.3%). Overall, the average benchmark scores reflect this near-parity: the 366H averages 41,263 while the 356H averages 41,215, a 0.1% difference that puts both chips in the 87th percentile of all CPUs.

FAQ

Q: Which processor has the higher boost clock?

A: The Intel Core Ultra 7 366H has a boost clock of 4.80 GHz, while the Intel Core Ultra 7 356H has a boost clock of 4.70 GHz. The 366H also has a slightly higher base clock at 2.00 GHz versus 1.90 GHz for the 356H.

Q: Why does the 366H win Cinebench R23 but lose Cinebench R15 and R20?

A: The data shows a 54.8% win for the 366H in R23 multi-core and a 97.1% win in R23 single-core, but the 356H wins R15 multi-core by 6.1% and R20 multi-core by 1.6%. This pattern suggests the two chips have different power or thermal behavior under sustained loads, with the 366H apparently better optimized for the newer R23 benchmark’s workload characteristics.

Q: Are these processors identical in core count and cache?

A: Yes, both the Intel Core Ultra 7 366H and the Intel Core Ultra 7 356H have 16 cores, 16 threads, 192 KB of L1 cache per core, 2.5 MB of L2 cache per core, and 18 MB of shared L3 cache. They also share the same 3 nm process node and Panther Lake architecture.

Q: Which chip has a higher average benchmark score?

A: The Intel Core Ultra 7 366H has an average benchmark score of 41,263, which is 0.1% higher than the 356H’s average of 41,215. Both chips sit in the 87th percentile of all CPUs, and the 356H’s nearest rival list shows a -0.1% delta against the 366H.

Q: Does the 356H win more benchmarks than the 366H?

A: Yes, the head-to-head data records 12 wins for the Intel Core Ultra 7 356H and 5 wins for the Intel Core Ultra 7 366H. The 356H’s wins are typically narrow, while the 366H’s wins in Cinebench R23 are exceptionally large.

Q: What memory and PCIe capabilities do these chips share?

A: Both support DDR5 and LPDDR5X memory in a dual-channel configuration with a memory bandwidth of 115.2 GB/s. They also both use Gen 5 PCIe with 12 lanes (CPU only) and lack ECC memory support.

Architecture Differences

The two processors are architecturally indistinguishable on paper. Both are built on the Panther Lake architecture, which is Intel’s codename for this generation, and both are manufactured on Intel’s 3 nm process node at Intel’s own foundry. They belong to the same Core Ultra Series 3 family and are classified as Ultra 7 (Panther Lake-H) generation parts. The integrated graphics are identical as well, with both chips featuring Intel Xe3 Graphics.

The core configuration is a perfect match: 16 cores and 16 threads, with no hyperthreading evident in the data, and a cache hierarchy that is exactly the same. Each core gets 192 KB of L1 cache and 2.5 MB of L2 cache, while the entire chip shares 18 MB of L3 cache. Both chips use the Intel BGA 2540 socket, are unlocked-multiplier-free, and have a production status of Active. They were both released on the same date, 2026-01-04, and carry part numbers SA4R9Q9EL for the 366H and SA4RGQ9EU for the 356H.

The only architectural difference that emerges from the data is the clock speed profile. The 366H runs at a base clock of 2.00 GHz and boosts to 4.80 GHz, while the 356H runs at 1.90 GHz base and boosts to 4.70 GHz. This 100 MHz advantage for the 366H in both base and boost clocks is the sole differentiator in the silicon characteristics, which makes the benchmark results all the more puzzling—the chip with the higher clocks should theoretically win everywhere, yet it loses the majority of tests.

Specification Differences

Comparing the specification sheets for the Intel Core Ultra 7 366H and the Intel Core Ultra 7 356H yields only a handful of differences, all related to clock speeds and part numbering. The base clock differs by 100 MHz: the 366H is rated at 2.00 GHz while the 356H is rated at 1.90 GHz. Similarly, the boost clock differs by 100 MHz: 4.80 GHz for the 366H versus 4.70 GHz for the 356H.

The part numbers are distinct, with the 366H using SA4R9Q9EL and the 356H using SA4RGQ9EU. Every other specification field is identical between the two chips: 16 cores, 16 threads, 25W TDP, Intel BGA 2540 socket, Panther Lake architecture, 3 nm process node, 192 KB L1 per core, 2.5 MB L2 per core, 18 MB shared L3, dual-channel DDR5/LPDDR5X memory support with 115.2 GB/s bandwidth, Gen 5 PCIe with 12 lanes, Intel Xe3 Graphics, no ECC memory, no unlocked multiplier, and the same 2026-01-04 release date.

It is importantly neither chip has a launch MSRP listed in the data, so no pricing information is available for comparison. The lack of any other differentiating specification means that the clock speed delta is the only hardware reason for the performance differences observed in the benchmarks, which makes the 366H’s massive R23 wins and the 356H’s broad but narrow wins a matter of workload-specific behavior rather than fundamental hardware variation.

Where Each One Wins

The Intel Core Ultra 7 366H is the clear winner for tasks that stress the newer Cinebench R23 rendering engine. Its 54.8% lead in multi-core and 97.1% lead in single-core R23 scores make it the obvious choice for anyone running that specific benchmark or similarly structured workloads. The 366H also shows a slight edge in Passmark floating point math (0.5%) and integer math (0.7%), suggesting it handles pure arithmetic and scientific computation marginally better. If a user’s primary software is built around the R23 test’s patterns—which often correlates with modern 3D rendering and content creation—the 366H is the superior part despite its lower overall win count.

The Intel Core Ultra 7 356H, on the other hand, is the more consistent all-rounder. It wins 12 of the 17 head-to-head comparisons, including the newer Passmark multi-thread test, data compression, encryption, extended instructions, and random string sorting. Its wins are narrow, ranging from 0.3% to 6.1%, but they cover a broader spectrum of everyday tasks. The 356H also wins the older Cinebench R15 and R20 tests, which might matter for legacy software compatibility. For general productivity, file compression, and database-style workloads, the 356H’s benchmark profile suggests it is the safer bet.

The verdict is not clean-cut. The average benchmark scores are separated by just 0.1%, and both chips sit at the 87th percentile, meaning they are statistically equivalent in overall performance. The 366H is a specialist that excels in a narrow but potentially critical workload, while the 356H is a generalist that wins more often but by smaller margins. Users should match the chip to their specific application mix: choose the 366H for Cinebench-heavy rendering tasks, and the 356H for a balanced mobile workload where consistent, if modest, wins across many tests translate to a smoother experience in varied software.