AMD Ryzen 9 5900 vs Intel Core i9-13900HX Comparison

The Intel Core i9-13900HX and AMD Ryzen 9 5900 are both high-end processors from different eras and market segments, yet they land within 2% of each other in average benchmark score (46098 vs 46971). This comparison pits a 24-core mobile flagship against a 12-core desktop part, and the data reveals a fascinating split: the Intel part dominates heavily in multi-threaded workloads, while the AMD chip counters with some surprising single-core wins that challenge Intel’s architectural advantages. The head-to-head benchmark table shows 13 wins for Intel and 4 for AMD, making the Ryzen’s victories particularly noteworthy given its much lower core count.

Head-to-Head Benchmarks

The most decisive Intel victory comes in floating-point math, where the 13900HX scores 110470 against the 5900’s 69124 — a 59.8% advantage. This is the largest delta in the entire head-to-head set, and it reflects the sheer throughput advantage of having 24 cores versus 12. Similarly, the physics test shows a 55.9% lead for Intel (2645 vs 1697), and the Cinebench R15 multicore result is a 54.7% blowout (4494.5 vs 2906). These are not marginal wins; they indicate that any workload that scales across many threads will heavily favor the Intel part.

The Passmark multithread score reinforces this trend, with Intel ahead by 26.8% (43062 vs 33969). Data compression also favors Intel by 29.1% (531224 vs 411453), and random string sorting shows a 36.4% lead (59199 vs 43386). The integer math test is another Intel win at 21.4% (156175 vs 128641), while data encryption adds a 22.4% edge (32130 vs 26247). Extended instructions go to Intel by 13.7% (30550 vs 26859). In Cinebench R20 multicore, Intel leads by 22.5% (14836 vs 12110), and the single-core R20 test also goes to Intel by the same 22.5% margin (2094 vs 1709).

The AMD Ryzen 9 5900, however, takes the most important single-threaded benchmark. In Cinebench R23 single-core, the 5900 wins by a massive 49.5% (4070 vs 2056). This is a stunning reversal, especially since the Intel chip has a higher boost clock of 5.40 GHz versus 4.70 GHz. The R15 single-core test also goes to AMD by 27.8% (410 vs 296). The 5900 also wins Cinebench R23 multicore by 3.2% (28834 vs 27900), which is remarkable given the 12-core vs 24-core mismatch. Finally, the find prime numbers test goes to AMD by 10.8% (213 vs 190). The Passmark single-thread test, however, goes to Intel by 18.7% (4081 vs 3439), which contradicts the Cinebench single-core results and suggests the two chips have very different strengths depending on the instruction mix.

Architecture Differences

The architectural divide is stark. The Intel Core i9-13900HX is built on Raptor Lake architecture using a 10 nm process at Intel’s own foundry, with a die size of 257 mm². It packs 24 cores and 32 threads, featuring a hybrid design that combines performance and efficiency cores. The cache hierarchy is generous: 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3. It supports both DDR4 and DDR5 memory, has 20 PCIe Gen 5 lanes, and includes integrated UHD Graphics 770. The base clock is 2.20 GHz with a boost of 5.40 GHz, and it has a 55W TDP. It launched in January 2023 with a launch MSRP of $668.

The AMD Ryzen 9 5900 uses Zen 3 architecture (codenamed Vermeer) on a 7 nm process from TSMC, with a dual-chiplet design of 2x 74 mm² and 8,300 million transistors. It offers 12 cores and 24 threads, with 64 KB L1 per core, 512 KB L2 per core, and a large 64 MB shared L3 cache. It supports only DDR4 memory with a dual-channel bus and 51.2 GB/s bandwidth, and uses 20 PCIe Gen 4 lanes. There is no integrated graphics. The base clock is 3.00 GHz with a 4.70 GHz boost, and the TDP is 65W. It launched in January 2021 and has no launch MSRP listed. The 5900 is a desktop part on Socket AM4, while the 13900HX is a mobile part on Intel BGA 1964.

Both chips support ECC memory and have unlocked multipliers. The process node difference (10 nm Intel vs 7 nm TSMC) and the cache layout (2 MB L2 per core for Intel vs 512 KB for AMD) are significant, as is the L3 cache size: 36 MB shared for Intel versus 64 MB for AMD. The AMD chip’s larger L3 cache likely contributes to its strong Cinebench R23 single-core performance.

FAQ

Q: Which processor wins in multi-threaded workloads?

A: The Intel Core i9-13900HX wins 13 of the 17 head-to-head benchmarks, including decisive victories in Passmark multithread (43062 vs 33969, a 26.8% lead) and Cinebench R15 multicore (4494.5 vs 2906, a 54.7% lead). Its 24 cores and 32 threads provide a substantial throughput advantage.

Q: How does the AMD Ryzen 9 5900 beat Intel in single-core Cinebench?

A: The 5900 wins Cinebench R23 single-core by 49.5% (4070 vs 2056) and R15 single-core by 27.8% (410 vs 296), despite having a lower boost clock of 4.70 GHz versus 5.40 GHz. This likely stems from its larger 64 MB L3 cache and Zen 3’s efficient architecture.

Q: What is the difference in average benchmark scores?

A: The AMD Ryzen 9 5900 has a higher average benchmark score of 46971 compared to the Intel Core i9-13900HX’s 46098, a difference of about 1.9%. Both chips sit at the 89th percentile among all CPUs.

Q: Which chip has better memory support?

A: The Intel Core i9-13900HX supports both DDR4 and DDR5, while the AMD Ryzen 9 5900 supports only DDR4. The Intel part also uses PCIe Gen 5, whereas the AMD part uses PCIe Gen 4.

Q: Are both processors unlocked for overclocking?

A: Yes, both the Intel Core i9-13900HX and the AMD Ryzen 9 5900 have unlocked multipliers, allowing for manual overclocking. However, the Intel part is a mobile processor, which may limit practical overclocking headroom in laptops.

Q: What is the transistor count difference?

A: The AMD Ryzen 9 5900 has 8,300 million transistors across its two chiplets, while the Intel Core i9-13900HX does not have a published transistor count in the data. The AMD chip’s process node is 7 nm versus Intel’s 10 nm.

Specification Differences

| Specification | Intel Core i9-13900HX | AMD Ryzen 9 5900 |

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

| Cores | 24 | 12 |

| Threads | 32 | 24 |

| Base Clock | 2.20 GHz | 3.00 GHz |

| Boost Clock | 5.40 GHz | 4.70 GHz |

| TDP | 55W | 65W |

| Process Node | 10 nm | 7 nm |

| Foundry | Intel | TSMC |

| Die Size | 257 mm² | 2x 74 mm² |

| L1 Cache | 80 KB (per core) | 64 KB (per core) |

| L2 Cache | 2 MB (per core) | 512 KB (per core) |

| L3 Cache | 36 MB (shared) | 64 MB |

| Memory Support | DDR4, DDR5 | DDR4 |

| Memory Bandwidth | Not listed | 51.2 GB/s |

| PCIe | Gen 5, 20 Lanes | Gen 4, 20 Lanes |

| Integrated Graphics | UHD Graphics 770 | None |

| Socket | Intel BGA 1964 | AMD Socket AM4 |

| Market Segment | Mobile | Desktop |

| Release Date | 2023-01-03 | 2021-01-11 |

Where Each One Wins

The Intel Core i9-13900HX is the clear winner for heavily threaded productivity and content creation. Its 59.8% lead in floating-point math and 55.9% lead in physics make it ideal for scientific computing, 3D rendering, and any simulation workload that leverages many cores. The 29.1% advantage in data compression and 36.4% lead in random string sorting point to strengths in file archiving, database operations, and data processing pipelines. The 22.4% edge in data encryption suggests it handles security-related tasks faster. For users who run parallel compiles, video encoding, or batch photo processing, the 13900HX’s 24 cores and 32 threads provide a significant throughput advantage over the 5900’s 12 cores and 24 threads.

The AMD Ryzen 9 5900 wins in a narrower but important set of scenarios. Its 49.5% lead in Cinebench R23 single-core is a major win for lightly-threaded applications, such as legacy software, certain game engines, or real-time audio processing that relies on a single fast core. The 27.8% lead in R15 single-core reinforces this pattern. The 3.2% win in Cinebench R23 multicore is notable because the 5900 achieves this with half the cores, suggesting exceptional per-core efficiency in that specific benchmark. The 10.8% win in find prime numbers indicates an advantage in integer-heavy, cache-sensitive workloads that fit within its 64 MB L3 cache. For a desktop user who primarily uses single-threaded applications or runs workloads that benefit from a large cache, the 5900 is competitive despite its lower core count.

The Verdict

The data paints a clear picture: the Intel Core i9-13900HX is the superior processor for multi-threaded workloads, winning 13 of 17 head-to-head comparisons and taking decisive leads in math, physics, and compression tests. Its 24 cores and 32 threads provide a raw throughput advantage that the 12-core Ryzen cannot match in most parallel tasks. The Passmark multithread score of 43062 versus 33969 (a 26.8% lead) and the Cinebench R15 multicore lead of 54.7% make it the obvious choice for anyone running heavily parallel workloads, regardless of the platform being mobile.

However, the AMD Ryzen 9 5900 is not obsolete. Its 49.5% single-core victory in Cinebench R23 is a stark reminder that core count is not everything; the 5900’s larger 64 MB L3 cache and Zen 3 design deliver exceptional performance in single-threaded tasks and even a modest 3.2% win in Cinebench R23 multicore. For users with workloads that are cache-sensitive or single-threaded, the 5900 holds its ground.

The average benchmark scores are nearly identical (46971 for AMD vs 46098 for Intel, less than 2% apart), and both sit at the 89th percentile. The choice comes down to workload: pick the Intel Core i9-13900HX for maximum multi-threaded performance, and pick the AMD Ryzen 9 5900 for single-threaded efficiency and a lower-power desktop footprint with a 65W TDP versus 55W. The Intel part’s support for DDR5 and PCIe Gen 5 also gives it a future-proofing edge in platform features, while the AMD part’s larger L3 cache is its key architectural counter.