AMD Ryzen 7 8840HX vs AMD Ryzen AI 7 345 Comparison

FAQ

Q: Which CPU delivers the higher multi-core performance in the database?

A: The AMD Ryzen 7 8840HX scores 25,265 in Cinebench R23 multi-core, which is 120.4% higher than the AMD Ryzen AI 7 345's score of 11,461. The 8840HX wins all 13 benchmark comparisons recorded in the database.

Q: How large is the single-core performance gap between the two processors?

A: The gap is narrow. The Ryzen 7 8840HX scores 1,857 in Cinebench R23 single-core, only 2.1% ahead of the Ryzen AI 7 345's 1,818. PassMark single-thread results show a similar 2.1% margin, with scores of 3,958 versus 3,875.

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

A: The AMD Ryzen 7 8840HX has 12 cores and 24 threads. The AMD Ryzen AI 7 345 has 6 cores and 12 threads. The 8840HX therefore doubles the core count and thread count of the Ryzen AI 7 345.

Q: How do the two CPUs compare in data encryption workloads?

A: The Ryzen 7 8840HX scores 29,919 in PassMark data encryption, which is 153.3% higher than the Ryzen AI 7 345's 11,814. This is the largest percentage advantage in the PassMark suite, aside from prime number finding.

Q: Which processor has the newer manufacturing process?

A: The AMD Ryzen AI 7 345 uses a 4 nm process at TSMC, while the AMD Ryzen 7 8840HX uses a 5 nm process at the same foundry. The Ryzen AI 7 345 also uses a newer architecture generation (Zen 5 / Zen 5c) compared to the 8840HX's Zen 4.

Q: What is the difference in overall performance percentiles?

A: The Ryzen 7 8840HX sits in the 94th percentile of all CPUs in the database, while the Ryzen AI 7 345 sits in the 81st percentile. The average benchmark score for the 8840HX is 71,797 versus 29,461 for the Ryzen AI 7 345.

Architecture Differences

The two processors come from different architectural generations. The AMD Ryzen 7 8840HX uses Zen 4 architecture under the Dragon Range codename, belonging to the 8000 series. The AMD Ryzen AI 7 345 uses the Krackan Point codename with a hybrid Zen 5 / Zen 5c configuration, part of the Ryzen AI 300 generation. The process node differs: the 8840HX is built on TSMC's 5 nm process, while the Ryzen AI 7 345 uses TSMC's 4 nm process.

Core configuration separates the two clearly. The 8840HX has 12 cores and 24 threads, all based on Zen 4. The Ryzen AI 7 345 has 6 cores and 12 threads, mixing Zen 5 and Zen 5c cores. The transistor count and die size are recorded only for the 8840HX: 13,140 million transistors across a dual-die layout of 2x 71 mm². No such figures are listed for the Ryzen AI 7 345.

Cache hierarchies also differ. The 8840HX provides 64 KB of L1 per core, 1 MB of L2 per core, and a shared 64 MB L3 cache. The Ryzen AI 7 345 provides 80 KB of L1 per core, 1 MB of L2 per core, but only 4 MB of L3 cache. The larger L3 allocation on the 8840HX is a major architectural advantage for multi-threaded workloads that reuse data.

Memory support shows a split. The 8840HX supports DDR5 only, with dual-channel memory and a recorded bandwidth of 83.2 GB/s. The Ryzen AI 7 345 supports both DDR5 and LPDDR5X, also dual-channel, with 89.6 GB/s bandwidth. Neither chip supports ECC memory. PCIe connectivity differs: the 8840HX offers Gen 5 with 28 lanes (CPU only), while the Ryzen AI 7 345 offers Gen 4 with 14 lanes (CPU only).

The integrated graphics also differ. The 8840HX uses a Radeon 610M, while the Ryzen AI 7 345 uses a Radeon 840M. The 8840HX has an unlocked multiplier, whereas the Ryzen AI 7 345 does not. The 8840HX uses AMD Socket FL1, the Ryzen AI 7 345 uses AMD Socket FP8. The thermal design power is 55 W for the 8840HX and 28 W for the Ryzen AI 7 345, indicating different intended power envelopes.

Head-to-Head Benchmarks

The benchmark data shows a complete sweep: the AMD Ryzen 7 8840HX wins all 13 recorded head-to-head comparisons. The largest margin appears in PassMark find prime numbers, where the 8840HX scores 304 versus 62 for the Ryzen AI 7 345, a 390.3% advantage. That workload is highly sensitive to core count and cache, both of which favor the 8840HX.

Data encryption shows a 153.3% lead for the 8840HX (29,919 versus 11,814). Integer math follows at 130.8% (146,506 versus 63,475). Random string sorting delivers a 127.9% margin (57,971 versus 25,435). Extended instructions show 114.8% (36,527 versus 17,003). Multi-thread performance in PassMark is 109.4% higher (41,732 versus 19,927). Data compression is 109% higher (496,427 versus 237,484). Floating point math is 103.5% higher (86,747 versus 42,621). Physics simulation shows a 100.6% margin (2,185 versus 1,089).

The Cinebench R23 multi-core result is the headline difference: 25,265 versus 11,461, a 120.4% gap. This aligns with the core count difference (12 versus 6) and the larger L3 cache on the 8840HX. The single-core results are much closer. Cinebench R23 single-core shows only a 2.1% lead for the 8840HX (1,857 versus 1,818). PassMark single-thread also shows 2.1% (3,958 versus 3,875). The Ryzen AI 7 345's newer Zen 5 architecture nearly closes the per-core performance gap, but the 8840HX still holds a slight edge.

The database also records a passmark_singlethread entry for both chips, which duplicates the passmark_single_thread result: 3,958 for the 8840HX and 3,875 for the Ryzen AI 7 345, again a 2.1% difference. Across all workloads, the average benchmark score for the 8840HX is 71,797, compared to 29,461 for the Ryzen AI 7 345. The former sits at the 94th percentile of all CPUs; the latter at the 81st percentile.

Specification Differences

| Specification | AMD Ryzen 7 8840HX | AMD Ryzen AI 7 345 |

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

| Cores | 12 | 6 |

| Threads | 24 | 12 |

| Base clock | 2.90 GHz | 2.00 GHz |

| Boost clock | 5.10 GHz | 4.60 GHz |

| TDP | 55 W | 28 W |

| Socket | AMD Socket FL1 | AMD Socket FP8 |

| Architecture | Zen 4 | Zen 5 / Zen 5c |

| Codename | Dragon Range | Krackan Point |

| Process node | 5 nm | 4 nm |

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

| L3 cache | 64 MB (shared) | 4 MB |

| Memory support | DDR5 | DDR5, LPDDR5X |

| Memory bandwidth | 83.2 GB/s | 89.6 GB/s |

| PCIe | Gen 5, 28 Lanes (CPU only) | Gen 4, 14 Lanes (CPU only) |

| Integrated graphics | Radeon 610M | Radeon 840M |

| Unlocked multiplier | Yes | No |

| Part number | 100-000001850 | 100-000002122 |

The release dates differ: the Ryzen AI 7 345 launched on 2025-01-14, while the Ryzen 7 8840HX launched on 2025-04-22. Both are active in production and target the mobile market. No launch MSRP is recorded for either chip.

Where Each One Wins

The AMD Ryzen 7 8840HX wins every recorded benchmark, so its advantages are categorical rather than workload-specific. The largest margins appear in prime number finding (390.3%), data encryption (153.3%), and integer math (130.8%). These tasks scale heavily with core count, thread count, and the 64 MB L3 cache. Multi-core rendering in Cinebench R23 also favors the 8840HX strongly, with a 120.4% lead. For any parallel compute task, the 8840HX is the clear choice based on the database.

The AMD Ryzen AI 7 345 has no benchmark wins, but its narrow 2.1% single-core deficit suggests it is competitive in lightly threaded scenarios. Its higher memory bandwidth (89.6 GB/s versus 83.2 GB/s) and support for LPDDR5X could benefit memory-sensitive workloads, though no direct benchmark in the database isolates that effect. Its lower TDP of 28 W versus 55 W indicates it is designed for a more power-constrained platform. The 4 nm process and newer Zen 5 architecture give it a per-core efficiency story that the 8840HX cannot match on paper.

The 8840HX also holds the overall performance percentile advantage: 94th versus 81st. Its nearest rivals include the Intel Core Ultra 7 265KF (0.2% lower average score) and Intel Xeon 6724P (0.8% lower), placing it at the top of its performance class. The Ryzen AI 7 345 sits alongside the AMD Ryzen 7 3800X (0% delta) and Intel Core i5-13500HX (0.7% higher), a mid-range grouping.

The Verdict

The data points to one conclusion: the AMD Ryzen 7 8840HX is the substantially faster processor in almost every measurable way. Its 12-core, 24-thread configuration with 64 MB of L3 cache delivers a 120.4% lead in multi-core rendering and at least 100% advantages across all multi-threaded PassMark tests. The single-core margin is small (2.1%), but it still favors the 8840HX. Anyone choosing strictly on benchmark performance should take the 8840HX.

The AMD Ryzen AI 7 345 offers a different trade-off. It uses a smaller 4 nm process, supports LPDDR5X memory, and draws only 28 W compared to 55 W. Its 6-core, 12-thread layout with Zen 5 / Zen 5c cores nearly matches the 8840HX in single-core tests, trailing by just 2.1%. It also carries a newer integrated GPU (Radeon 840M versus Radeon 610M) and Gen 4 PCIe, but with half the lanes (14 versus 28). The Ryzen AI 7 345 is better suited to a compact, low-power mobile design where the 8840HX's higher TDP and larger cache footprint would be excessive.

For users who prioritize raw compute throughput, the Ryzen 7 8840HX is the only choice. For those who need a lighter, more efficient processor that still delivers modern single-core performance, the Ryzen AI 7 345 fits that profile, but it cannot compete on multi-threaded workloads. The database records zero benchmark wins for the Ryzen AI 7 345, so any selection of that chip must rely on platform-level factors such as power, memory type, and integrated graphics, not on measured CPU performance.