AMD Ryzen 9 9900X3D vs Intel Core Ultra 7 356H Comparison

The Verdict

The benchmark data presents an unambiguous outcome. The AMD Ryzen 9 9900X3D wins all 17 head-to-head comparisons recorded in the database, with the Intel Core Ultra 7 356H failing to claim a single victory. The average benchmark score for the AMD part is 54,762, placing it in the 91st percentile of all CPUs, while the Intel mobile chip averages 41,215, sitting in the 87th percentile. The gap is substantial across every tested workload, from single-threaded tasks to heavily parallelized multi-core renders.

These two processors serve fundamentally different market segments. The Ryzen 9 9900X3D is a desktop part on AMD Socket AM5 with a 120 TDP and an unlocked multiplier, aimed at high-performance desktop builds. The Core Ultra 7 356H is a mobile processor on Intel BGA 2540 with a 25 TDP and a locked multiplier, designed for laptops. The data shows that the desktop part dominates in raw performance, but the mobile chip delivers that level of capability within a significantly lower power envelope. The choice between them is not about which is faster, as the database clearly shows the AMD part is faster across the board. The choice is strictly about platform: desktop users should select the 9900X3D, while mobile users have only the Intel option available in this comparison.

Architecture Differences

The architectural split between these two processors is wide. The AMD Ryzen 9 9900X3D uses the Zen 5 architecture under the Granite Ridge codename, built on a 4 nm process at TSMC. It integrates 16,630 million transistors across a dual-chiplet design with a die size of 2x 70.6 mm². The Intel Core Ultra 7 356H uses the Panther Lake architecture, also its codename, manufactured on a 3 nm process at Intel's own foundry. The database does not list transistor counts or die sizes for the Intel part.

Core configuration differs significantly. The AMD chip has 12 cores and 24 threads, while the Intel chip has 16 cores but only 16 threads, meaning the Intel part does not support simultaneous multithreading. The AMD part compensates with a much larger L3 cache: 128 MB versus 18 MB shared on the Intel side. Per-core cache also differs, with Intel listing 192 KB of L1 per core and 2.5 MB of L2 per core, compared to 80 KB L1 and 1 MB L2 per core on the AMD side. The AMD processor features Radeon Graphics as integrated graphics, while the Intel chip uses Intel Xe3 Graphics.

Memory architecture shows another divergence. Both support DDR5, but the Intel part adds LPDDR5X support for mobile power efficiency. The AMD chip offers a memory bandwidth of 89.6 GB/s, while the Intel part lists 115.2 GB/s, a higher figure despite the mobile positioning. ECC memory support is present on the AMD desktop part but absent on the Intel mobile chip. PCIe lane counts also differ: the AMD CPU provides 24 Gen 5 lanes, while the Intel part provides 12 Gen 5 lanes. The AMD chip's base clock is 4.40 GHz with a boost of 5.50 GHz, whereas the Intel chip runs at 1.90 GHz base and 4.70 GHz boost.

Head-to-Head Benchmarks

The largest victory for the AMD Ryzen 9 9900X3D comes in Cinebench R23 single-core, where it scores 6,739 against 2,040 for the Intel part, a delta of 230.3%. That is the single biggest percentage gap in the entire comparison. Cinebench R23 multi-core shows a 159.5% advantage, with scores of 47,737 versus 18,395. These are not modest leads; they represent more than double and more than triple the performance respectively.

Cinebench R15 and R20 tell a similar story. In R15 multi-core, the AMD part scores 4,811 versus 3,055, a 57.5% lead. In R15 single-core, the gap widens to 124.1%, with 679 versus 303. R20 multi-core shows 20,049 versus 12,153, a 65% delta, and R20 single-core also shows exactly 65%, with 2,830 versus 1,715.

PassMark workloads reveal where the AMD chip excels most. Integer math shows a 116.2% lead, scoring 179,727 versus 83,111. Data compression shows a 103.8% advantage, with 685,074 versus 336,177. Extended instructions score 55,426 versus 27,898, a 98.7% delta. Random string sorting shows 71,864 versus 40,990, a 75.3% gap. Finding prime numbers scores 544 versus 327, a 66.4% lead. The multithread test shows 56,154 versus 33,978, a 65.3% advantage. Physics simulation scores 5,340 versus 2,895, an 84.5% delta.

The narrowest wins for the AMD part come in floating-point math and single-thread tests. PassMark floating-point math shows 119,622 versus 103,128, a 16% lead. PassMark single-thread shows 4,646 versus 4,072, a 14.1% advantage. Data encryption shows 33,282 versus 26,345, a 26.3% delta. Even in these closer contests, the AMD desktop part maintains a clear edge.

Specification Differences

| Specification | AMD Ryzen 9 9900X3D | Intel Core Ultra 7 356H |

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

| Cores | 12 | 16 |

| Threads | 24 | 16 |

| Base Clock | 4.40 GHz | 1.90 GHz |

| Boost Clock | 5.50 GHz | 4.70 GHz |

| TDP | 120 | 25 |

| Socket | AMD Socket AM5 | Intel BGA 2540 |

| Architecture | Zen 5 | 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) | 2.5 MB (per core) |

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

| Memory Support | DDR5 | DDR5, LPDDR5X |

| Memory Bandwidth | 89.6 GB/s | 115.2 GB/s |

| ECC Memory | Yes | No |

| PCIe Lanes | Gen 5, 24 Lanes (CPU only) | Gen 5, 12 Lanes (CPU only) |

| Integrated Graphics | Radeon Graphics | Intel Xe3 Graphics |

| Market Segment | Desktop | Mobile |

| Multiplier Unlocked | Yes | No |

| Release Date | 2025-01-05 | 2026-01-04 |

| Launch MSRP | $599 | Not listed |

FAQ

Q: Which processor wins more benchmark comparisons?

A: The AMD Ryzen 9 9900X3D wins all 17 head-to-head comparisons recorded in the database. The Intel Core Ultra 7 356H wins zero.

Q: How large is the performance gap in multi-core workloads?

A: In Cinebench R23 multi-core, the AMD part scores 47,737 versus 18,395 for the Intel part, a 159.5% advantage. In Cinebench R20 multi-core, the AMD part leads by 65%, scoring 20,049 versus 12,153.

Q: Is the Intel chip competitive in single-threaded performance?

A: The Intel chip is closer in single-threaded tests but still loses. PassMark single-thread shows 4,646 versus 4,072, a 14.1% delta. Cinebench R23 single-core shows a much larger gap of 230.3%, with 6,739 versus 2,040.

Q: What are the core and thread counts for each processor?

A: The AMD Ryzen 9 9900X3D has 12 cores and 24 threads. The Intel Core Ultra 7 356H has 16 cores and 16 threads, meaning it lacks simultaneous multithreading.

Q: Which processor offers more cache?

A: The AMD part has 128 MB of L3 cache, while the Intel part has 18 MB of shared L3. Per-core L1 and L2 caches are larger on the Intel side: 192 KB L1 and 2.5 MB L2 versus 80 KB L1 and 1 MB L2 on the AMD side.

Q: How do the two processors compare in memory bandwidth?

A: The Intel Core Ultra 7 356H lists 115.2 GB/s of memory bandwidth, higher than the AMD Ryzen 9 9900X3D's 89.6 GB/s. The Intel part also supports LPDDR5X in addition to DDR5, while the AMD part supports DDR5 only.