AMD Ryzen 9 9900X3D vs Intel Core Ultra X7 358H Comparison

AMD Ryzen 9 9900X3D dominates the Intel Core Ultra X7 358H across every recorded benchmark, with the most extreme gaps appearing in multi-threaded and single-threaded rendering workloads. The AMD part wins all 17 head-to-head tests, while the Intel mobile processor fails to claim a single victory. The average benchmark score of 54,762 for the Ryzen 9 9900X3D against 40,967 for the Core Ultra X7 358H places the AMD chip in the 91st percentile of all CPUs, compared to the 87th percentile for Intel.

Head-to-Head Benchmarks

The largest single margin appears in Cinebench R23 single-core, where the Ryzen 9 9900X3D scores 6,739 versus 2,080 for the Core Ultra X7 358H, a 224% advantage. This result is striking because single-thread performance typically compresses differences between architectures, yet the Zen 5 desktop part more than triples the Intel mobile chip’s output. The R23 multi-core test shows a similar pattern: 47,737 against 18,747, a 154.6% delta. Cinebench R20 single-core delivers 2,830 versus 1,695 (67% ahead), and R20 multi-core gives 20,049 versus 12,011 (66.9% ahead). Cinebench R15 single-core shows 679 versus 301.5 (125.2% ahead), while R15 multi-core lands at 4,811 versus 3,027 (58.9% ahead).

Integer math produces the second-largest gap. PassMark integer math scores 179,727 for the Ryzen 9 9900X3D against 83,147 for the Intel part, a 116.2% difference. Data compression follows closely: 685,074 versus 332,508, a 106% lead. Extended instructions show 55,426 versus 27,274, a 103.2% margin. Random string sorting records 71,864 against 40,357, a 78.1% advantage. Physics simulation scores 5,340 versus 3,021, a 76.8% lead. The passmark multithread test gives 56,154 versus 33,802, a 66.1% difference. Prime number finding shows 544 versus 337, a 61.4% margin.

The narrowest wins still favor AMD decisively. PassMark floating point math shows 119,622 versus 103,842, a 15.2% advantage. Single-thread passmark results are 4,646 versus 4,124, a 12.7% lead. Data encryption records 33,282 versus 26,046, a 27.8% margin. Across all 17 shared tests, the Ryzen 9 9900X3D never falls below a 12.7% lead, and the median advantage sits near 67%. The Intel Core Ultra X7 358H’s nearest rivals in the database (Core Ultra 7 356H, Core Ultra 7 366H, Ryzen AI 5 PRO 440) all sit within 0.7% of its average score, confirming it performs as expected for its mobile class, but that class operates in a different performance tier entirely.

Architecture Differences

The two processors come from fundamentally different design targets. The AMD Ryzen 9 9900X3D uses Zen 5 architecture on the Granite Ridge codename, built on a 4 nm TSMC process with 16,630 million transistors across a dual-die layout of 2x 70.6 mm². It packs 12 cores and 24 threads, with a base clock of 4.40 GHz and a boost clock of 5.50 GHz. The Intel Core Ultra X7 358H belongs to the Core Ultra Series 3, codenamed Panther Lake (Panther Lake-H), manufactured on Intel’s 3 nm process. It provides 16 cores but only 16 threads, meaning no simultaneous multithreading. Base clock sits at 1.90 GHz, boosting to 4.80 GHz.

Cache hierarchies differ substantially. The AMD part allocates 80 KB of L1 per core, 1 MB of L2 per core, and a massive 128 MB of L3 cache. The Intel chip offers 192 KB of L1 per core, 3 MB of L2 per core, but only 18 MB of shared L3. The Ryzen 9 9900X3D’s L3 advantage reaches 110 MB, which directly explains its dominance in data compression and integer workloads. The Intel part’s 16 cores without hyperthreading versus AMD’s 12 cores with 24 threads means the Ryzen chip processes two threads per physical core, while the Intel chip processes one.

Memory bandwidth favors the Intel part: 153.6 GB/s for LPDDR5X dual-channel support versus 89.6 GB/s for DDR5 dual-channel on the AMD side. Yet this bandwidth advantage does not translate into benchmark wins. The AMD processor supports ECC memory, while the Intel chip does not. PCIe lanes also diverge sharply: the Ryzen 9 9900X3D offers Gen 5 with 24 CPU lanes, while the Core Ultra X7 358H provides only Gen 5 with 4 CPU lanes. Integrated graphics differ as well: the AMD part carries Radeon Graphics, while the Intel chip uses Arc B390.

Market positioning explains the design choices. The Ryzen 9 9900X3D targets desktop systems on AMD Socket AM5 with a 120 W TDP and an unlocked multiplier. The Core Ultra X7 358H targets mobile platforms on Intel BGA 2540 with a 25 W TDP and a locked multiplier. The Intel chip’s release date is one year later (January 2026 versus January 2025), yet it still trails in every metric. The AMD part carries a launch MSRP of $599; the Intel part has no listed launch MSRP.

The Verdict

Benchmark data indicates the AMD Ryzen 9 9900X3D is the superior processor for every workload recorded in the database. The 224% single-core Cinebench R23 lead and the 154.6% multi-core lead are not marginal wins; they represent a generational and class-based gap. The Intel Core Ultra X7 358H, despite having 16 cores to AMD’s 12, cannot overcome the lack of multithreading and the much smaller L3 cache. The 25 W TDP of the Intel part suggests a power-constrained mobile design, while the 120 W TDP of the AMD part reflects an unrestricted desktop part. For any user comparing these two directly, the Ryzen 9 9900X3D wins every benchmark category, from rendering to integer math to encryption. The Intel chip’s higher memory bandwidth and newer process node do not compensate for the core count and cache deficits. The data shows no scenario where the Core Ultra X7 358H outperforms the Ryzen 9 9900X3D.

FAQ

Q: Which processor has more cores?

A: The Intel Core Ultra X7 358H has 16 cores, while the AMD Ryzen 9 9900X3D has 12 cores. However, the AMD chip has 24 threads versus 16 threads for the Intel part, because Intel does not enable simultaneous multithreading on this model.

Q: How large is the cache difference?

A: The AMD Ryzen 9 9900X3D has 128 MB of L3 cache, while the Intel Core Ultra X7 358H has 18 MB of shared L3. The AMD part also uses 80 KB L1 and 1 MB L2 per core, versus 192 KB L1 and 3 MB L2 per core for Intel.

Q: What is the biggest benchmark margin?

A: The largest recorded delta is in Cinebench R23 single-core, where the AMD Ryzen 9 9900X3D scores 6,739 versus 2,080 for the Intel Core Ultra X7 358H, a 224% advantage.

Q: Does the Intel part have any benchmark win?

A: No. Across all 17 head-to-head tests, the AMD Ryzen 9 9900X3D wins every single one. The Intel Core Ultra X7 358H records zero wins.

Q: Which processor has higher memory bandwidth?

A: The Intel Core Ultra X7 358H supports LPDDR5X with 153.6 GB/s bandwidth, while the AMD Ryzen 9 9900X3D supports DDR5 with 89.6 GB/s. Despite this, the Intel part loses all memory-sensitive benchmarks like data compression.

Q: What are the power ratings?

A: The AMD Ryzen 9 9900X3D has a 120 W TDP, while the Intel Core Ultra X7 358H has a 25 W TDP. The Intel part is designed for mobile use, and the AMD part for desktop use.

Where Each One Wins

The AMD Ryzen 9 9900X3D wins every recorded benchmark, so the analysis focuses on the magnitude of its advantages. The largest leads appear in multi-threaded rendering: Cinebench R23 multi-core shows a 154.6% delta, and Cinebench R23 single-core shows a 224% delta. Data-heavy workloads also favor AMD heavily: data compression scores 685,074 versus 332,508, a 106% lead, and integer math scores 179,727 versus 83,147, a 116.2% lead. Extended instructions and random string sorting follow with 103.2% and 78.1% advantages respectively.

The Intel Core Ultra X7 358H comes closest in floating point math, where it trails by only 15.2%, and in single-thread passmark, where the gap narrows to 12.7%. These two tests represent the Intel chip’s best relative performance, likely due to its higher per-core L2 cache (3 MB versus 1 MB) and its 3 nm process. However, even in these closest contests, the AMD part still wins by double digits. The Intel chip’s 153.6 GB/s memory bandwidth does not produce a win in any bandwidth-sensitive test, suggesting the 18 MB L3 cache becomes the bottleneck for data reuse.

For users prioritizing maximum multi-threaded throughput, single-thread responsiveness, or cache-heavy integer workloads, the Ryzen 9 9900X3D delivers between 15.2% and 224% more performance depending on the test. The Core Ultra X7 358H offers no recorded scenario where it takes the lead, so the only reason to select it would be the mobile form factor (BGA 2540 socket, 25 W TDP) rather than any performance attribute. The data confirms the desktop-class AMD part outclasses the mobile-class Intel part in every measurable way.

Specification Differences

| Specification | AMD Ryzen 9 9900X3D | Intel Core Ultra X7 358H |

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

| Cores | 12 | 16 |

| Threads | 24 | 16 |

| Base clock | 4.40 GHz | 1.90 GHz |

| Boost clock | 5.50 GHz | 4.80 GHz |

| TDP | 120 W | 25 W |

| Socket | AMD Socket AM5 | Intel BGA 2540 |

| Codename | Granite Ridge | Panther Lake |

| Process node | 4 nm | 3 nm |

| Foundry | TSMC | Intel |

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

| ECC memory | Yes | No |

| PCIe lanes | Gen 5, 24 lanes | Gen 5, 4 lanes |

| Integrated graphics | Radeon Graphics | Arc B390 |

| Market segment | Desktop | Mobile |

| Release date | January 2025 | January 2026 |

| Unlocked multiplier | Yes | No |

| Transistors | 16,630 million | Not listed |

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

| Launch MSRP | $599 | Not listed |