AMD Ryzen 9 7845HX vs Intel Core i9-13900HX Comparison

The AMD Ryzen 9 7845HX and Intel Core i9-13900HX are both flagship mobile processors, yet they achieve their high scores through fundamentally different strategies. The data shows a clear split: Intel wins the majority of head-to-head tests (13 wins to AMD’s 8), but AMD’s victories are often by larger margins, particularly in specialized workloads. The Ryzen 9 7845HX leads in multi-threaded PassMark, extended instruction throughput, and prime number finding, while the Core i9-13900HX dominates in floating-point math, single-threaded tasks, and most 3DMark threading tests. Neither chip is universally faster; the right choice depends entirely on the specific workload.

Where Each One Wins

The Intel Core i9-13900HX is the pick for general-purpose and single-threaded performance. It wins every 3DMark test except the 16-thread and 8-thread variants, taking the single-thread crown with a score of 1102 against AMD’s 1025 (a 7% advantage). In Cinebench, Intel’s lead is consistent: it wins both R15 multicore (4494.5 vs 4320) and R23 multicore (27900 vs 26876), along with a substantial 9.9% edge in R23 single-core (2056 vs 1852). The Core i9 also dominates floating-point math, scoring 110470 vs 94287, a 14.6% gap, and physics simulations (2645 vs 2346, an 11.3% lead). For everyday responsiveness, gaming, and lightly-threaded applications, the 13900HX is demonstrably faster.

The AMD Ryzen 9 7845HX wins where raw core count and efficient multi-threading matter. Its most striking victory is in PassMark’s extended instructions test, where it scores 41020 versus Intel’s 30550—a massive 34.3% advantage. It also crushes Intel in prime number finding (329 vs 190, a 73.2% delta) and leads in overall PassMark multithread (45010 vs 43062). Data compression (543539 vs 531224) and encryption (32789 vs 32130) go to AMD by 2.3% and 2.1% respectively. This pattern indicates a processor that excels in scientific computing, cryptographic workloads, and heavily parallel integer tasks, even though it has fewer cores than its rival.

Architecture Differences

The two chips are built on opposite design philosophies. The Ryzen 9 7845HX uses AMD’s Zen 4 architecture on a 5 nm TSMC process, with a die size of 2x 71 mm² and 13,140 million transistors. It packs 12 cores and 24 threads, with a base clock of 3.00 GHz and boost of 5.20 GHz. Its cache layout is generous: 64 KB L1 and 1 MB L2 per core, plus a massive 64 MB shared L3 cache. This large L3 is a key reason for its strong performance in data-heavy tasks.

The Core i9-13900HX uses Intel’s Raptor Lake architecture on a 10 nm process, with a single 257 mm² die. It features 24 cores and 32 threads—double the physical cores of the AMD chip—with a lower 2.20 GHz base clock but a higher 5.40 GHz boost. Intel’s cache is also per-core: 80 KB L1 and 2 MB L2, but the shared L3 is just 36 MB, nearly half of AMD’s. Memory support differs too: Intel supports both DDR4 and DDR5, while AMD is DDR5-only. Both are dual-channel, but AMD lists a memory bandwidth of 83.2 GB/s, while Intel’s is not provided. Both support ECC memory, both use Gen 5 PCIe, but AMD has 28 lanes versus Intel’s 20. The integrated graphics differ, with AMD’s Radeon 610M against Intel’s UHD Graphics 770. Both CPUs are unlocked for overclocking.

FAQ

Q: Which processor has more cores?

A: The Intel Core i9-13900HX has 24 cores and 32 threads, while the AMD Ryzen 9 7845HX has 12 cores and 24 threads.

Q: Is the AMD chip faster in any multi-core test?

A: Yes. The Ryzen 9 7845HX wins PassMark multithread (45010 vs 43062) and the 3DMark 16-thread test (10068 vs 8929, a 12.8% lead), despite having fewer cores.

Q: How do they compare in single-core performance?

A: Intel leads in every single-threaded benchmark. The 13900HX scores 1102 in 3DMark single-thread vs 1025, and 2056 in Cinebench R23 single-core vs 1852 (a 9.9% advantage).

Q: Which CPU is better for floating-point math?

A: Intel is significantly better, scoring 110470 in PassMark floating-point math compared to AMD’s 94287, a 14.6% difference.

Q: Do both support DDR5 memory?

A: Yes, both support DDR5, but the Intel chip also supports DDR4, while the AMD chip is DDR5-only.

Q: What is the largest benchmark gap between the two?

A: The biggest gap is in PassMark find prime numbers, where AMD leads by 73.2% (329 vs 190). The next largest is PassMark extended instructions, where AMD leads by 34.3% (41020 vs 30550).

Specification Differences

| Specification | AMD Ryzen 9 7845HX | Intel Core i9-13900HX |

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

| Cores | 12 | 24 |

| Threads | 24 | 32 |

| Base Clock | 3.00 GHz | 2.20 GHz |

| Boost Clock | 5.20 GHz | 5.40 GHz |

| Process Node | 5 nm (TSMC) | 10 nm (Intel) |

| Die Size | 2x 71 mm² | 257 mm² |

| Transistors | 13,140 million | Not provided |

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

| L2 Cache | 1 MB (per core) | 2 MB (per core) |

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

| Memory Support | DDR5 | DDR4, DDR5 |

| Memory Bandwidth | 83.2 GB/s | Not provided |

| PCIe Lanes | Gen 5, 28 Lanes | Gen 5, 20 Lanes |

| Integrated Graphics | Radeon 610M | UHD Graphics 770 |

| Socket | AMD Socket FL1 | Intel BGA 1964 |

| Launch MSRP | Not provided | $668 |

Head-to-Head Benchmarks

The most decisive Intel win is in PassMark floating-point math, where it scores 110470 against AMD’s 94287, a 14.6% margin. This is complemented by a 11.3% lead in PassMark physics (2645 vs 2346) and a 7% lead in 3DMark single-thread (1102 vs 1025). In Cinebench R23, Intel leads by 3.7% in multicore (27900 vs 26876) and a more substantial 9.9% in single-core (2056 vs 1852). The 3DMark results show Intel ahead in 2-thread (2143 vs 1988), 4-thread (4012 vs 3807), and max-thread (11738 vs 11108), but AMD takes the 8-thread test (7140 vs 6857) and the 16-thread test by a large 12.8% (10068 vs 8929).

AMD’s counterattack is concentrated in specific integer and encryption workloads. The 73.2% lead in find prime numbers (329 vs 190) is the largest delta on the board. The 34.3% advantage in extended instructions (41020 vs 30550) shows a major architectural strength for AMD. In PassMark multithread, AMD wins by 4.5% (45010 vs 43062), and it also takes random string sorting (63223 vs 59199, a 6.8% lead). Data compression and encryption go to AMD by 2.3% and 2.1%, respectively. Interestingly, Intel wins PassMark integer math by a razor-thin 0.7% (156175 vs 155118) and Cinebench R15 single-core by only 0.3% (296 vs 295), showing that AMD is competitive even when it loses.

The Verdict

The data points to a clear conclusion: choose the Intel Core i9-13900HX if your priority is broad, consistent performance across typical workloads. Intel wins 13 of 21 head-to-head benchmarks, including all single-threaded tests, all Cinebench variants, and the majority of 3DMark results. Its 24 cores and 32 threads, despite a lower base clock, provide superior floating-point throughput and physics performance. For gaming, office work, and single-threaded applications, the 13900HX is the faster processor.

Choose the AMD Ryzen 9 7845HX if your work is dominated by specific multi-threaded, integer-heavy, or encryption tasks. AMD’s 12-core, 24-thread design with a 64 MB L3 cache delivers decisive wins in extended instructions, prime number finding, data compression, and encryption. Its 34.3% and 73.2% margins in those tests are far larger than any Intel lead elsewhere. The Ryzen also wins PassMark multithread and the 3DMark 16-thread test, suggesting it scales better in certain highly parallel scenarios despite fewer physical cores. Both chips sit at the 89th percentile of all CPUs, but they are not interchangeable; the optimal pick hinges on whether the workload favors Intel’s brute-force core count or AMD’s efficient Zen 4 architecture.