AMD Ryzen 9 9955HX3D vs Intel Core Ultra X7 358H Comparison

FAQ

Q: Which processor has more cores and threads?

A: Both processors have 16 cores, but the AMD Ryzen 9 9955HX3D supports 32 threads, while the Intel Core Ultra X7 358H supports 16 threads.

Q: What are the boost clock speeds of these two chips?

A: The AMD Ryzen 9 9955HX3D boosts up to 5.40 GHz, while the Intel Core Ultra X7 358H boosts up to 4.80 GHz.

Q: How do their average benchmark scores compare?

A: The AMD Ryzen 9 9955HX3D has an average benchmark score of 97,453, placing it in the 96th percentile of all CPUs, while the Intel Core Ultra X7 358H scores 40,967, placing it in the 87th percentile.

Q: Which processor has more L3 cache?

A: The AMD Ryzen 9 9955HX3D has 128 MB of L3 cache, while the Intel Core Ultra X7 358H has 18 MB of shared L3 cache.

Q: Do both processors support ECC memory?

A: No, the AMD Ryzen 9 9955HX3D supports ECC memory, but the Intel Core Ultra X7 358H does not.

Q: What are the TDP ratings for each?

A: The AMD Ryzen 9 9955HX3D has a TDP of 55 W, while the Intel Core Ultra X7 358H has a TDP of 25 W.

Architecture Differences

The AMD Ryzen 9 9955HX3D belongs to the Ryzen 9 series within the 9000 series, built on the Zen 5 architecture with the codename Fire Range. It is manufactured by TSMC on a 4 nm process node and contains 16,630 million transistors across a dual-die design with each die measuring 70.6 mm². The Intel Core Ultra X7 358H is part of the Core Ultra Series 3, built on the Panther Lake codename with Panther Lake-H generation, and is manufactured by Intel on a 3 nm process node. The database does not list transistor count or die size for the Intel part.

Cache configurations differ substantially. The AMD chip provides 80 KB of L1 cache per core and 1 MB of L2 cache per core, with a large 128 MB L3 cache. The Intel chip offers 192 KB of L1 cache per core and 3 MB of L2 cache per core, but only 18 MB of shared L3 cache. This gives the AMD processor a significant total cache advantage, particularly in the L3 tier.

Memory support also diverges. The AMD Ryzen 9 9955HX3D uses DDR5 memory on a dual-channel bus with 89.6 GB/s of bandwidth, while the Intel Core Ultra X7 358H uses LPDDR5X memory on a dual-channel bus with a higher 153.6 GB/s of bandwidth. ECC memory is supported on the AMD chip but not on the Intel chip. PCIe connectivity differs as well: the AMD processor provides Gen 5 with 28 lanes (CPU only), while the Intel processor provides Gen 5 with 4 lanes (CPU only).

The integrated graphics solutions are different. The AMD chip includes a Radeon 610M, while the Intel chip includes an Arc B390. The AMD processor has an unlocked multiplier, whereas the Intel processor does not. The AMD part uses the AMD Socket FL1, and the Intel part uses Intel BGA 2540. Release dates are close, with the AMD chip released in January 2025 and the Intel chip in January 2026. Both processors are marked as Active in production status and target the mobile market segment.

The Verdict

The benchmark data is unambiguous. The AMD Ryzen 9 9955HX3D wins all 15 head-to-head benchmark comparisons against the Intel Core Ultra X7 358H. The scale of the victory varies by workload, but the pattern is consistent across every test category.

The AMD chip's average benchmark score of 97,453 puts it in the 96th percentile of all CPUs, and its nearest rivals are all AMD workstation and server parts: the Ryzen Threadripper PRO 5965WX at 98,504 (1.1% ahead), the Ryzen 9 PRO 9945 at 96,083 (1.4% behind), the EPYC 4565P at 95,764 (1.8% behind), and the EPYC 9175F at 95,615 (1.9% behind). This places it in a performance class well above mainstream mobile processors.

The Intel Core Ultra X7 358H, with an average score of 40,967, sits in the 87th percentile. Its nearest rivals are the AMD Ryzen AI 5 PRO 440 at 41,208 (0.6% ahead), the Intel Core Ultra 7 356H at 41,215 (0.6% ahead), the AMD Ryzen AI 5 PRO 435G at 40,718 (0.6% behind), and the Intel Core Ultra 7 366H at 41,263 (0.7% ahead). The Intel chip is competitive with those mid-range parts but operates in a different tier from the AMD flagship.

Users who need maximum multi-threaded throughput, heavy computational workloads, or large data processing will find the AMD Ryzen 9 9955HX3D clearly superior. The Intel Core Ultra X7 358H delivers lower power consumption at 25 W TDP compared to 55 W, and higher memory bandwidth at 153.6 GB/s versus 89.6 GB/s, but the performance gap in the recorded benchmarks is substantial. The data indicates the AMD chip is the choice for raw performance, while the Intel chip may appeal in scenarios where the lower TDP and higher memory bandwidth are priorities.

Specification Differences

The two processors differ in nearly every major specification category.

| Specification | AMD Ryzen 9 9955HX3D | Intel Core Ultra X7 358H |

|---|---|---|

| Series | 9000 series | Core Ultra Series 3 |

| Cores | 16 | 16 |

| Threads | 32 | 16 |

| Base clock | 2.50 GHz | 1.90 GHz |

| Boost clock | 5.40 GHz | 4.80 GHz |

| TDP | 55 W | 25 W |

| Socket | AMD Socket FL1 | Intel BGA 2540 |

| Architecture | Zen 5 | Not listed |

| Codename | Fire Range | Panther Lake |

| Generation | Ryzen 9 (Zen 5 (Fire Range)) | Ultra X7 (Panther Lake-H) |

| Process node | 4 nm | 3 nm |

| Foundry | TSMC | Intel |

| Transistors | 16,630 million | Not listed |

| Die size | 2x 70.6 mm² | Not listed |

| L1 cache | 80 KB (per core) | 192 KB (per core) |

| L2 cache | 1 MB (per core) | 3 MB (per core) |

| L3 cache | 128 MB | 18 MB (shared) |

| Memory support | DDR5 | LPDDR5X |

| Memory bus | Dual-channel | Dual-channel |

| Memory bandwidth | 89.6 GB/s | 153.6 GB/s |

| ECC memory | Yes | No |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 5, 4 Lanes (CPU only) |

| Integrated graphics | Radeon 610M | Arc B390 |

| Multiplier unlocked | Yes | No |

| Part number | 100-000001030 | SA4RAQ9ET |

| Release date | January 2025 | January 2026 |

Head-to-Head Benchmarks

The AMD Ryzen 9 9955HX3D dominates the Intel Core Ultra X7 358H across all 15 benchmark comparisons, with margins ranging from 3.8% to 167.6%.

The largest gap appears in PassMark integer math. The AMD chip scores 222,503 against 83,147 for the Intel chip, a 167.6% advantage. Data compression shows a similar pattern: 785,811 for AMD versus 332,508 for Intel, a 136.3% difference. Extended instructions testing yields 62,813 for AMD versus 27,274 for Intel, a 130.3% margin. Random string sorting produces 83,497 for AMD versus 40,357 for Intel, a 106.9% difference.

Cinebench multi-core results reinforce the pattern. In Cinebench R23 multi-core, the AMD chip scores 38,161.5 versus 18,747 for the Intel chip, a 103.6% lead. Cinebench R15 multi-core shows 6,042.5 for AMD versus 3,027 for Intel, a 99.6% advantage. PassMark multi-thread testing gives 62,674 for AMD versus 33,802 for Intel, an 85.4% margin.

Single-threaded performance is closer but still favors AMD. PassMark single-thread scores are 4,511 for AMD versus 4,124 for Intel, a 9.4% difference. Cinebench R23 single-core shows 2,159.5 for AMD versus 2,080 for Intel, a 3.8% margin, the smallest gap in the entire dataset. Cinebench R15 single-core is 332 for AMD versus 301.5 for Intel, a 10.1% difference.

Other tests show moderate-to-large AMD advantages. Data encryption scores 39,446 for AMD versus 26,046 for Intel, a 51.4% margin. Find prime numbers yields 525 for AMD versus 337 for Intel, a 55.8% difference. Physics testing gives 4,687 for AMD versus 3,021 for Intel, a 55.1% margin. Floating point math produces 144,122 for AMD versus 103,842 for Intel, a 38.8% advantage.

The Intel chip's closest result relative to the AMD competitor is in Cinebench R23 single-core, where it trails by only 3.8%. Every other test shows a double-digit percentage gap. The database records 15 wins for the AMD Ryzen 9 9955HX3D and 0 wins for the Intel Core Ultra X7 358H. The performance hierarchy is clear: the AMD chip sits at the 96th percentile of all CPUs, while the Intel chip sits at the 87th percentile.