Intel Core Ultra 7 356H vs Intel Core Ultra X7 358H Comparison

Both processors in this comparison are 16-core, 16-thread mobile parts built on Intel's 3 nm Panther Lake architecture, shipping in the same BGA 2540 package with a 25 W TDP and an identical 1.90 GHz base clock. The Intel Core Ultra 7 356H and Intel Core Ultra X7 358H are separated by only 0.6% in average benchmark score (41215 vs 40967), placing both at the 87th percentile of all CPUs. Despite the near-identical aggregate performance, the head-to-head data reveals a fascinating split: the 356H wins 9 of 17 benchmarks while the 358H wins 8, but the margins tell a more nuanced story. The 356H tends to dominate in a cluster of related workloads, while the 358H counters with wins in raw compute and physics-oriented tasks, making the choice between them depend heavily on the specific application mix.

Where Each One Wins

The Intel Core Ultra 7 356H establishes its territory in memory and data manipulation tasks. Its wins in passmark data compression (336177 vs 332508, +1.1%), data encryption (26345 vs 26046, +1.1%), and random string sorting (40990 vs 40357, +1.6%) suggest an edge in workloads that shuffle large datasets through the cache hierarchy. The pattern continues with extended instructions (27898 vs 27274, +2.3%), the largest single-core advantage in the entire comparison. The 356H also takes the older Cinebench R15 and R20 tests, both multi-core (3055 vs 3027, +0.9%; 12153 vs 12011, +1.2%) and single-core (303 vs 301.5, +0.5%; 1715 vs 1695, +1.2%), plus the passmark multithread score (33978 vs 33802, +0.5%). This adds up to a processor that feels more responsive in everyday productivity and data-centric scenarios.

The Intel Core Ultra X7 358H, meanwhile, claims the more modern Cinebench R23 results, winning multi-core (18747 vs 18395, +1.9%) and single-core (2080 vs 2040, +1.9%) with identical margins. Its other victories are in passmark physics (3021 vs 2895, +4.2%, the largest delta in the entire comparison), floating point math (103842 vs 103128, +0.7%), find prime numbers (337 vs 327, +3%), and single-thread (4124 vs 4072, +1.3%). The integer math score is a virtual tie at 83147 vs 83111, with a deltaPct of 0. The 358H's wins cluster around raw computational throughput and floating-point-heavy tasks, suggesting it may have a slight edge in scientific or simulation workloads that stress the execution units directly.

Architecture Differences

Both chips share the Panther Lake codename, 3 nm process node, Intel foundry, and 192 KB of L1 cache per core. The first major divergence appears in L2 cache: the 356H provides 2.5 MB per core while the 358H offers 3 MB per core, a 20% increase that likely contributes to the 358H's wins in physics and prime number calculations. L3 cache is identical at 18 MB shared, and both support dual-channel memory with ECC disabled. The memory story differs significantly: the 356H supports both DDR5 and LPDDR5X, while the 358H is limited to LPDDR5X only. More importantly, the memory bandwidth jumps from 115.2 GB/s on the 356H to 153.6 GB/s on the 358H, a 33% advantage for the latter. This bandwidth difference could explain why the 358H performs better in floating-point math, which often benefits from faster data feeding.

The PCIe configurations also diverge sharply. The 356H exposes Gen 5 with 12 lanes (CPU only), while the 358H offers Gen 5 with just 4 lanes (CPU only). This means the 356H has triple the PCIe connectivity, which could matter for users planning to connect multiple high-speed devices. Integrated graphics differ as well: the 356H uses Intel Xe3 Graphics, while the 358H steps up to Arc B390. Both are unlocked multipliers? No, both are locked (multiplierUnlocked: false). The boost clock favors the 358H at 4.80 GHz versus 4.70 GHz, a 2.1% difference that aligns with its single-thread wins. Both CPUs launched on the same date (2026-01-04), carry active production status, and belong to the Core Ultra Series 3 family, though the 356H is generation "Ultra 7 (Panther Lake-H)" and the 358H is "Ultra X7 (Panther Lake-H)".

The Verdict

Looking strictly at the benchmark data, the Intel Core Ultra 7 356H is the better choice for users whose workloads involve data compression, encryption, string sorting, or extended instruction sets. Its wins in Cinebench R15 and R20, plus the passmark multithread score, indicate strong performance in legacy and mixed-thread applications. The 356H also offers triple the PCIe lanes (12 vs 4) and broader memory support (DDR5 and LPDDR5X vs LPDDR5X only), making it more flexible for system builders who need connectivity options.

The Intel Core Ultra X7 358H, on the other hand, is preferable for physics simulations, prime number calculations, and floating-point math. Its Cinebench R23 victories, both multi-core and single-core, suggest better performance in the latest rendering workloads. The 358H's larger L2 cache (3 MB vs 2.5 MB per core) and 33% higher memory bandwidth (153.6 GB/s vs 115.2 GB/s) provide a theoretical foundation for its compute-oriented wins. The single-thread score (4124 vs 4072, +1.3%) and higher boost clock (4.80 vs 4.70 GHz) also make it the pick for lightly-threaded responsiveness.

The average benchmark scores are nearly identical (41215 vs 40967, a 0.6% gap), so neither chip represents a clear overall winner. The 356H wins more individual tests (9 vs 8) but by smaller average margins, while the 358H's wins include two of the largest deltas (physics at -4.2% and prime numbers at -3%). For most users, the choice should hinge on specific application priorities: data-centric productivity points to the 356H, while compute-heavy scientific or simulation work favors the 358H.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core Ultra X7 358H boosts to 4.80 GHz, while the Intel Core Ultra 7 356H tops out at 4.70 GHz.

Q: Do both CPUs support the same memory types?

A: No. The 356H supports both DDR5 and LPDDR5X, while the 358H supports only LPDDR5X.

Q: What is the memory bandwidth difference between the two?

A: The 358H has 153.6 GB/s bandwidth, which is 33% higher than the 356H's 115.2 GB/s.

Q: Which chip wins in physics benchmarks?

A: The Intel Core Ultra X7 358H wins passmark physics with a score of 3021, compared to 2895 for the 356H, a delta of 4.2%.

Q: Are the L2 cache sizes different?

A: Yes. The 356H has 2.5 MB per core, while the 358H has 3 MB per core.

Q: Which processor has more PCIe lanes?

A: The Intel Core Ultra 7 356H has 12 Gen 5 lanes (CPU only), while the 358H has only 4 Gen 5 lanes.

Head-to-Head Benchmarks

The largest win for the Intel Core Ultra 7 356H comes in passmark extended instructions, where it scores 27898 versus 27274 for the 358H, a 2.3% advantage. This is closely followed by random string sorting (40990 vs 40357, +1.6%) and Cinebench R20 multi-core (12153 vs 12011, +1.2%). The 356H also takes Cinebench R15 multi-core (3055 vs 3027, +0.9%), data compression (336177 vs 332508, +1.1%), data encryption (26345 vs 26046, +1.1%), Cinebench R20 single-core (1715 vs 1695, +1.2%), Cinebench R15 single-core (303 vs 301.5, +0.5%), and passmark multithread (33978 vs 33802, +0.5%). These nine wins demonstrate consistency across diverse workloads, with no single test where the 356H loses by more than 1.9%.

The Intel Core Ultra X7 358H counters with the biggest margin of the entire comparison: passmark physics at 3021 versus 2895, a 4.2% gap. It also excels in find prime numbers (337 vs 327, +3%), Cinebench R23 multi-core (18747 vs 18395, +1.9%), Cinebench R23 single-core (2080 vs 2040, +1.9%), and passmark single-thread (4124 vs 4072, +1.3%). Floating point math goes to the 358H by a slim 0.7% (103842 vs 103128), and integer math is effectively tied at 83147 vs 83111 (0% deltaPct). The 358H's eight wins include the two most decisive victories, suggesting that in workloads where it excels, it does so more decisively than the 356H does in its specialty areas.

Specification Differences

The two processors diverge in several key specifications. The boost clock differs: 4.70 GHz for the 356H versus 4.80 GHz for the 358H. L2 cache per core is 2.5 MB for the 356H and 3 MB for the 358H. Memory support varies, with the 356H accepting both DDR5 and LPDDR5X while the 358H only accepts LPDDR5X. Memory bandwidth is 115.2 GB/s for the 356H and 153.6 GB/s for the 358H. PCIe configurations differ significantly: the 356H has Gen 5 with 12 lanes (CPU only), while the 358H has Gen 5 with 4 lanes (CPU only). Integrated graphics differ as well: the 356H uses Intel Xe3 Graphics, while the 358H uses Arc B390. The generation naming also differs, with "Ultra 7 (Panther Lake-H)" for the 356H and "Ultra X7 (Panther Lake-H)" for the 358H, though both share the same Part Number family (SA4RGQ9EU for the 356H, SA4RAQ9ET for the 358H). Identical specs include 16 cores, 16 threads, 1.90 GHz base clock, 25 W TDP, Intel BGA 2540 socket, 3 nm process node, 192 KB L1 cache per core, 18 MB shared L3 cache, dual-channel memory bus, no ECC support, false multiplier unlock, mobile market segment, active production status, and a release date of 2026-01-04.