AMD Ryzen 9 9950X3D vs Intel Core Ultra 7 356H Comparison

Where Each One Wins

The benchmark split is unambiguous. Across 15 recorded head-to-head tests, the AMD Ryzen 9 9950X3D wins every single discipline. The Intel Core Ultra 7 356H does not claim a single victory in any shared workload, whether single-threaded, multi-threaded, or specialized instruction-level tests.

The AMD processor sits at the 95th percentile of all CPUs in the database, with an average benchmark score of 75,779. The Intel part sits at the 87th percentile with an average score of 41,215. That places the AMD desktop chip roughly 84% higher on average score, a gap that reflects its positioning as a flagship desktop part versus a mobile-focused mainstream processor.

The largest deltas come in integer-heavy and compression workloads. In PassMark integer math, the AMD chip leads by 192.6%. In data compression, it leads by 170.2%. In extended instruction tests, the lead is 161.7%. These are workloads that scale with core count, cache capacity, and memory bandwidth, all areas where the desktop part has substantial physical advantages.

For single-threaded responsiveness, the gap narrows considerably but still favors AMD. The R15 single-core test shows only a 15.5% delta, and the R23 single-core test shows 10.7%. The PassMark single-thread test records a 16.3% delta. The Intel mobile chip is competitive in lightly threaded scenarios, but the AMD part maintains a consistent edge.

The use-case split is therefore straightforward: the Ryzen 9 9950X3D is the choice for any workload that engages multiple cores or exploits large caches. The Core Ultra 7 356H remains a capable mobile processor, but against this particular desktop flagship, it does not win any measured category.

Architecture Differences

The two processors come from fundamentally different design philosophies and market segments. The AMD Ryzen 9 9950X3D is a 16-core, 32-thread desktop part built on the Zen 5 architecture with the Granite Ridge codename. It uses TSMC's 4 nm process and fits the AMD Socket AM5. The Intel Core Ultra 7 356H is a 16-core, 16-thread mobile part built on the Panther Lake architecture, using Intel's own 3 nm process and the BGA 2540 socket.

The thread count difference is notable. Both parts have 16 cores, but AMD enables simultaneous multithreading, yielding 32 threads. Intel does not, so the Core Ultra 7 356H stays at 16 threads. That is a structural disadvantage in heavily threaded workloads, and the benchmark data reflects it.

Cache organization differs sharply. The AMD part provides 80 KB of L1 per core, 1 MB of L2 per core, and 128 MB of L3 cache. The Intel part provides 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3. The AMD chip has far more total cache, which directly benefits workloads that repeatedly access large data sets. The Intel chip has more per-core L1 and L2, which can help in latency-sensitive single-threaded code, but the total cache pool is much smaller.

Memory support also differs. The AMD part uses DDR5 with dual-channel memory and 89.6 GB/s of bandwidth. The Intel part supports both DDR5 and LPDDR5X, also dual-channel, with 115.2 GB/s of bandwidth. The Intel mobile chip actually has a higher rated memory bandwidth, despite being the lower-performance part overall. That bandwidth advantage does not translate into benchmark wins, likely because the core count and cache limitations dominate.

The AMD part supports ECC memory; the Intel part does not. PCIe lane counts differ as well: AMD provides Gen 5 with 24 CPU lanes, Intel provides Gen 5 with 12 CPU lanes. The AMD chip has an unlocked multiplier, the Intel chip does not. Integrated graphics differ, with AMD using Radeon Graphics and Intel using Xe3 Graphics. The AMD part is a desktop component with a 170 W TDP, while the Intel part is a mobile component with a 25 W TDP.

The transistor count and die size for the AMD part are recorded as 16,630 million transistors across 2x 70.6 mm² dies. No transistor count or die size is recorded for the Intel part. The AMD part launched with a $699 MSRP; the Intel part has no recorded launch MSRP.

Head-to-Head Benchmarks

The Cinebench results illustrate the scale of the multi-core advantage. In Cinebench R23 multi-core, the AMD part scores 42,018 against the Intel part's 18,395, a 128.4% delta. In R15 multi-core, the scores are 6,536 versus 3,055, a 113.9% delta. The AMD part more than doubles the Intel chip in both multi-core render tests.

Single-core Cinebench results are closer. In R23 single-core, AMD scores 2,259 against Intel's 2,040, a 10.7% delta. In R15 single-core, AMD scores 350 against Intel's 303, a 15.5% delta. The AMD architecture holds a single-thread advantage, but it is modest compared with the multi-thread gap.

PassMark integer math shows the biggest separation: 243,209 for AMD versus 83,111 for Intel, a 192.6% delta. Data compression follows at 908,421 versus 336,177, a 170.2% delta. Extended instructions show 73,011 versus 27,898, a 161.7% delta. Random string sorting shows 95,423 versus 40,990, a 132.8% delta. These are all workloads where the combination of 32 threads, large L3 cache, and higher clock speeds gives the AMD part a commanding lead.

Floating-point math is the closest of the heavy compute workloads: 159,724 versus 103,128, a 54.9% delta. Prime number finding shows 613 versus 327, an 87.5% delta. Physics simulation shows 5,670 versus 2,895, a 95.9% delta. Data encryption shows 44,536 versus 26,345, a 69% delta.

The PassMark multi-thread score is 70,255 for AMD versus 33,978 for Intel, a 106.8% delta. PassMark single-thread is 4,737 versus 4,072, a 16.3% delta. The single-thread score is the same figure recorded twice under two test names, confirming consistency.

The AMD part also holds a lead in 3DMark tests, though those are not part of the shared head-to-head set. The recorded scores for AMD are 16,374 in 16-thread, 2,549 in 2-thread, 4,963 in 4-thread, 9,259 in 8-thread, 17,184 in max-thread, and 1,292 in single-thread. No corresponding Intel scores are recorded in the shared set, so a direct comparison is not possible from the database.

FAQ

Q: Which processor has more threads?

A: The AMD Ryzen 9 9950X3D has 32 threads from 16 cores. The Intel Core Ultra 7 356H has 16 threads from 16 cores. The AMD part uses simultaneous multithreading to double its thread count.

Q: How large is the cache difference?

A: The AMD part has 128 MB of L3 cache, 1 MB of L2 per core, and 80 KB of L1 per core. The Intel part has 18 MB of shared L3, 2.5 MB of L2 per core, and 192 KB of L1 per core. The AMD chip has substantially more total cache.

Q: Does the Intel part support ECC memory?

A: No. The Intel Core Ultra 7 356H does not support ECC memory. The AMD Ryzen 9 9950X3D does support ECC memory.

Q: Which processor has higher memory bandwidth?

A: The Intel part has a rated memory bandwidth of 115.2 GB/s. The AMD part has a rated memory bandwidth of 89.6 GB/s. Both use dual-channel memory buses, but Intel supports LPDDR5X in addition to DDR5.

Q: What is the thermal design power for each?

A: The AMD Ryzen 9 9950X3D has a 170 W TDP. The Intel Core Ultra 7 356H has a 25 W TDP. The Intel mobile chip is designed for much lower power draw.

Q: Are the processors in the same socket?

A: No. The AMD part uses AMD Socket AM5. The Intel part uses Intel BGA 2540. They are not interchangeable.

Specification Differences

| Specification | AMD Ryzen 9 9950X3D | Intel Core Ultra 7 356H |

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

| Cores | 16 | 16 |

| Threads | 32 | 16 |

| Base clock | 4.30 GHz | 1.90 GHz |

| Boost clock | 5.70 GHz | 4.70 GHz |

| TDP | 170 W | 25 W |

| Socket | AMD Socket AM5 | Intel BGA 2540 |

| Architecture | Zen 5 | Panther Lake |

| Codename | Granite Ridge | Panther Lake |

| Process node | 4 nm (TSMC) | 3 nm (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 | 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 | $699 | Not recorded |

| Transistors | 16,630 million | Not recorded |

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

| Average benchmark score | 75,779 | 41,215 |

| Percentile vs all CPUs | 95 | 87 |

The base clock difference is substantial: 4.30 GHz versus 1.90 GHz. The boost clock difference is smaller: 5.70 GHz versus 4.70 GHz. The AMD part runs at a much higher idle and sustained frequency, which contributes to its single-thread advantage. The Intel part compensates with a smaller process node and lower TDP, but the benchmark data shows that the AMD part maintains a lead in every recorded shared test.