AMD Ryzen 9 9900X vs Intel Core Ultra X9 378H Comparison

Head-to-Head Benchmarks

The head-to-head data between the AMD Ryzen 9 9900X and the Intel Core Ultra X9 378H shows a clear split between single-thread efficiency and raw multi-thread throughput. The AMD part wins 11 of the 15 recorded comparisons, while the Intel mobile processor takes 4. The largest margin belongs to AMD in passmark_integer_math, where the 9900X scores 181056 against 92603, a 95.5% advantage. That near-doubling of integer throughput is the most decisive gap in the entire dataset.

The Ryzen part also dominates in memory and compression workloads. Passmark data compression shows 683579 for AMD versus 386591 for Intel, a 76.8% lead. Extended instructions follow the same pattern: 55243 versus 31315, a 76.4% delta. Random string sorting goes to AMD by 61.3%, with scores of 72013 and 44648. These three results cluster together, suggesting the AMD chip handles large data movement and instruction-heavy workloads with substantially more headroom.

Multi-threaded rendering benchmarks tell a more nuanced story. In cinebench r23 multicore, the Intel part actually wins by a narrow margin, 32553 versus 32172, a 1.2% delta. That is a surprising result for a 25 W mobile processor against a 120 W desktop chip, and it flips the expected narrative. However, the older cinebench r15 multicore test goes decisively to AMD, 5008 versus 3281, a 52.6% advantage. The discrepancy between the two Cinebench versions suggests the Intel chip scales better in the newer workload, while the AMD part has the edge in the older one.

Single-core results are where Intel builds its case. Cinebench r23 singlecore shows 4595 for Intel against 2253 for AMD, a 51% lead. Cinebench r15 singlecore gives Intel 462 versus 353, a 23.6% advantage. These are large margins, and they indicate that the Intel core design has a significant per-thread performance advantage in rendering workloads. Yet passmark single_thread tells a different story: AMD wins 4672 to 4453, a 4.9% delta. The contradiction between Cinebench and PassMark single-thread results means the winner depends heavily on the specific instruction mix and workload characteristics.

The remaining PassMark tests favor AMD by smaller margins. Floating point math goes to AMD by 4.9% (120083 versus 114500). Data encryption favors AMD by 12% (33421 versus 29840). Find prime numbers goes to AMD by 22.1% (436 versus 357). The physics test is essentially a tie: Intel wins 3404 versus 3381, a 0.7% delta that falls within noise territory. PassMark multithread gives AMD a 42.7% lead, 54643 versus 38298.

The overall average benchmark score in the database places the AMD part at 57498, with a percentile rank of 92 among all CPUs. The Intel part averages 47468, ranking at the 89th percentile. The nearest rivals for AMD include the AMD EPYC 9015 at 57555 (0.1% ahead) and the Intel Core i9-14900 at 58115 (1.1% ahead). The Intel mobile chip sits near the AMD Ryzen 9 PRO 5945 at 47527 and the Intel Core i9-12900F at 47176, showing it competes with previous-generation desktop parts despite its mobile positioning.

Where Each One Wins

The AMD Ryzen 9 9900X claims victory in every PassMark test except physics, and it takes the older Cinebench r15 multicore benchmark. The data shows this processor is built for sustained multi-threaded compute: integer math, floating point math, encryption, compression, sorting, and extended instruction workloads all favor the desktop chip. The 42.7% multithread lead in PassMark reinforces this pattern, as do the 12% encryption and 22.1% prime number margins. For workloads that hammer all cores with mixed data types, the AMD part is the clear choice.

The Intel Core Ultra X9 378H wins in single-core rendering and the modern Cinebench r23 multicore test. The 51% single-core lead in r23 is the standout result, and the 23.6% r15 single-core edge confirms that Intel has the faster individual core in this comparison. The r23 multicore win, despite the 16-core/16-thread configuration lacking simultaneous multithreading, indicates that the Intel chip's per-core efficiency can overcome its thread count disadvantage in at least one major rendering workload. The physics test win, though marginal at 0.7%, adds to Intel's case in simulation-style workloads.

For users focused on Cinebench-style rendering, the Intel part looks competitive or superior. For users running PassMark-style mixed workloads, the AMD part delivers between 4.9% and 95.5% higher scores. The data does not support a single winner across all applications; it supports a workload-dependent split.

Architecture Differences

The two processors represent fundamentally different design philosophies. The AMD Ryzen 9 9900X uses the Zen 5 architecture on the Granite Ridge codename, built on a 4 nm process at TSMC with 16,630 million transistors across a 2x 70.6 mm² die configuration. It has 12 cores and 24 threads, with a base clock of 4.40 GHz and a boost clock of 5.60 GHz. The Intel Core Ultra X9 378H uses the Panther Lake codename from the Panther Lake-H generation, built on Intel's 3 nm process. It has 16 cores and 16 threads, meaning no hyperthreading, with a base clock of 2.00 GHz and a boost clock of 5.00 GHz.

Cache layouts differ sharply. AMD provides 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of L3 cache. Intel provides 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3. The AMD chip's 64 MB L3 cache is more than triple the Intel chip's 18 MB, which helps explain its dominance in data-heavy PassMark tests like compression and random string sorting. Intel's larger per-core L1 and L2 caches may contribute to its single-core rendering wins.

Memory support diverges as well. AMD uses DDR5 with dual-channel access and 89.6 GB/s bandwidth, plus ECC support. Intel uses LPDDR5X with dual-channel access and 153.6 GB/s bandwidth, without ECC. The Intel chip's memory bandwidth is 71.4% higher, which may factor into its Cinebench r23 multicore result despite the smaller cache. PCIe connectivity also differs: AMD offers Gen 5 with 24 lanes from the CPU, while Intel offers Gen 5 with only 4 lanes from the CPU, reflecting the mobile versus desktop design targets.

The power envelope is a major differentiator. AMD's TDP is 120 W, while Intel's is 25 W. The Intel chip delivers competitive or superior results in several benchmarks while consuming a fraction of the power budget, which points to a much higher performance-per-watt profile in the recorded data. The AMD chip is unlocked for overclocking and uses the AMD Socket AM5, while the Intel chip is a locked, BGA 2540 mobile part. Integrated graphics differ: AMD includes Radeon Graphics, while Intel includes the Arc B390. The release dates also differ, with AMD launching on 2024-08-14 and Intel on 2026-04-03, putting the Intel part roughly a year and a half newer.

The Verdict

The recorded data supports a clear conditional verdict. For multi-threaded mixed workloads, the AMD Ryzen 9 9900X is the stronger processor. The 95.5% integer math lead, 76.8% compression lead, 76.4% extended instructions lead, and 42.7% multithread lead are too large to ignore. The 92nd percentile ranking and 57498 average score place it above the Intel part's 89th percentile and 47468 average. The desktop chip also offers 24 threads against 16, 64 MB of L3 against 18 MB, and ECC memory support, all of which appear in the data as structural advantages.

For single-core rendering and the specific Cinebench r23 workload, the Intel Core Ultra X9 378H takes the lead. The 51% single-core r23 margin and the 1.2% multicore r23 win show that Intel's newer core design, on a 3 nm process, delivers exceptional per-thread performance. The 25 W TDP makes that performance even more notable. Users prioritizing the newest Cinebench rendering tests would see better results from the Intel part.

The database does not declare an overall winner. It shows two processors optimized for different environments: one desktop chip with massive thread count and cache for sustained compute, one mobile chip with high single-core speed and efficiency for power-constrained tasks. The choice depends on which benchmark family matches the intended workload.

FAQ

Q: Which processor has the higher average benchmark score?

A: The AMD Ryzen 9 9900X averages 57498, while the Intel Core Ultra X9 378H averages 47468. AMD also ranks at the 92nd percentile versus Intel's 89th.

Q: How large is AMD's lead in integer math?

A: The AMD chip scores 181056 in passmark_integer_math against Intel's 92603, a 95.5% advantage, the largest delta in the head-to-head dataset.

Q: Where does Intel win by the biggest margin?

A: Intel's largest win is in cinebench r23 singlecore, scoring 4595 against AMD's 2253, a 51% lead. Intel also wins r15 singlecore by 23.6% and r23 multicore by 1.2%.

Q: Do the two processors use different memory types?

A: Yes. AMD supports DDR5 with 89.6 GB/s bandwidth and ECC memory. Intel supports LPDDR5X with 153.6 GB/s bandwidth and no ECC support.

Q: What are the core and thread counts?

A: AMD has 12 cores and 24 threads. Intel has 16 cores and 16 threads, so Intel has more physical cores but no simultaneous multithreading.

Q: How do the power ratings compare?

A: AMD has a 120 W TDP, while Intel has a 25 W TDP, a 95 W difference in the recorded specifications.

Specification Differences

| Field | AMD Ryzen 9 9900X | Intel Core Ultra X9 378H |

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

| Cores | 12 | 16 |

| Threads | 24 | 16 |

| Base Clock | 4.40 GHz | 2.00 GHz |

| Boost Clock | 5.60 GHz | 5.00 GHz |

| TDP | 120 W | 25 W |

| Socket | AMD Socket AM5 | Intel BGA 2540 |

| Architecture | Zen 5 | (not specified) |

| Codename | Granite Ridge | Panther Lake |

| Generation | Ryzen 9 (Zen 5, Granite Ridge) | Ultra X9 (Panther Lake-H) |

| Process Node | 4 nm | 3 nm |

| Foundry | TSMC | Intel |

| Transistors | 16,630 million | (not specified) |

| Die Size | 2x 70.6 mm² | (not specified) |

| L1 Cache | 80 KB per core | 192 KB per core |

| L2 Cache | 1 MB per core | 2.5 MB per core |

| L3 Cache | 64 MB | 18 MB shared |

| Memory Support | DDR5 | LPDDR5X |

| Memory Bandwidth | 89.6 GB/s | 153.6 GB/s |

| ECC Memory | Yes | No |

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

| Integrated Graphics | Radeon Graphics | Arc B390 |

| Market Segment | Desktop | Mobile |

| Multiplier Unlocked | Yes | No |

| Release Date | 2024-08-14 | 2026-04-03 |

| Launch MSRP | $499 | (not specified) |