AMD Ryzen 5 PRO 8645HS vs AMD Ryzen Embedded 9900X Comparison

The AMD Ryzen 5 PRO 8645HS and AMD Ryzen Embedded 9900X sit in different parts of AMD's lineup: one is an 8000-series mobile processor, the other a 9000-series desktop embedded processor. The database contains measured benchmark scores for the 8645HS, while the 9900X has no recorded benchmark scores. That imbalance defines the comparison.

Head-to-Head Benchmarks

The database records no direct head-to-head benchmark entries for these two CPUs. The head-to-head win counts are 0 for both processors. The only measured scores belong to the 8645HS.

The 8645HS has Cinebench results in R15, R20, and R23. In Cinebench R15, it records 1989 multi-core and 280 single-core. In Cinebench R20, it records 8291 multi-core and 1170 single-core. In Cinebench R23, it records 19742 multi-core and 2787 single-core.

PassMark results for the 8645HS are also recorded. The multithread score is 23569, and the single-thread score is 3858. Integer math scores 72740, floating point math scores 45481, data compression scores 265826, data encryption scores 17387, extended instructions scores 21212, physics scores 1208, random string sorting scores 35472, and find prime numbers scores 73. Within this set, the largest absolute PassMark result is data compression at 265826, while the smallest is find prime numbers at 73.

The aggregate average benchmark score for the 8645HS is 30879, placing it in the 82nd percentile of all CPUs. Its nearest rival data puts that score in context. The 8645HS is 0.4% above the Ryzen 7 8700F, whose average score is 30746. It is 0.5% below the Intel Core i7-13700TE, whose average score is 31028. It is 0.6% below the AMD Ryzen 9 8945HS, whose average score is 31074, and 0.6% below the Intel Core i7-12700F, whose average score is 31081.

For the Ryzen Embedded 9900X, no Cinebench or PassMark scores are recorded. Its average benchmark score is 0, and its percentile rank is 50. The database lists no nearest rival data for the 9900X. There is therefore no measured performance basis for a direct win in either direction.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen Embedded 9900X has 12 cores and 24 threads. The AMD Ryzen 5 PRO 8645HS has 6 cores and 12 threads.

Q: What are the Cinebench scores for the 8645HS?

A: In Cinebench R15, the 8645HS scores 1989 multi-core and 280 single-core. In R20, it scores 8291 multi-core and 1170 single-core. In R23, it scores 19742 multi-core and 2787 single-core.

Q: What PassMark scores are recorded for the 8645HS?

A: The database records multithread 23569, single-thread 3858, integer math 72740, floating point math 45481, data compression 265826, data encryption 17387, extended instructions 21212, physics 1208, random string sorting 35472, and find prime numbers 73.

Q: Does the 9900X have any recorded benchmark scores?

A: No. The database records no benchmark scores for the 9900X. Its average benchmark score is 0, and its percentile rank is 50.

Q: Do both processors support ECC memory?

A: Yes. Both list ECC memory support as true.

Q: Which processor has a larger L3 cache?

A: The 9900X has 64 MB L3 cache. The 8645HS has 16 MB shared L3 cache.

The Verdict

The performance record is lopsided: the 8645HS has measured scores, while the 9900X does not. The 8645HS has Cinebench and PassMark scores, an aggregate average of 30879, and an 82nd percentile rank. The 9900X has an aggregate average of 0 and a 50th percentile rank, with no Cinebench or PassMark scores. Therefore, no benchmark-based performance ranking can be made between them.

The specification record is clearer. The 9900X offers 12 cores, 24 threads, a 4.40 base clock, a 5.60 boost clock, 64 MB L3, PCIe Gen 5 with 24 lanes, and an unlocked multiplier. The 8645HS offers 6 cores, 12 threads, a 4.30 base clock, a 5.00 boost clock, 16 MB L3, PCIe Gen 4 with 20 lanes, and a locked multiplier. The 8645HS has the lower TDP at 45, against 120 for the 9900X.

A selection based on measured data points to the 8645HS. A selection based on desktop embedded specifications points to the 9900X, with the caveat that its performance is unmeasured in this database.

Specification Differences

| Specification | AMD Ryzen 5 PRO 8645HS | AMD Ryzen Embedded 9900X |

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

| Series | 8000 series | 9000 series |

| Cores | 6 | 12 |

| Threads | 12 | 24 |

| Base clock | 4.30 | 4.40 |

| Boost clock | 5.00 | 5.60 |

| TDP | 45 | 120 |

| Socket | AMD Socket FP7 | AMD Socket AM5 |

| Codename | Hawk Point | Granite Ridge |

| Generation | Ryzen 5 (Zen 4 (Hawk Point)) | Ryzen Embedded (Zen 5 (Granite Ridge)) |

| Transistors | 25,000 million | 16,630 million |

| Die size | 178 mm² | 2x 70.6 mm² |

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

| L3 cache | 16 MB (shared) | 64 MB |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 5, 24 Lanes (CPU only) |

| Integrated graphics | Radeon 760M | Radeon Graphics |

| Market segment | Mobile | Desktop |

| Release date | 2024-04-15 | 2025-10-06 |

| Multiplier unlocked | false | true |

| Part number | 100-000001315(FP7r2),100-000001388(FP7) | 100-000000662E |

Architecture Differences

Both processors are built on TSMC's 4 nm process, so the node is not a point of separation. The architecture lineage is different: the database identifies the 8645HS as Zen 4 (Hawk Point) and the 9900X as Zen 5 (Granite Ridge).

Core and cache layouts differ accordingly. The 9900X carries 12 cores and 24 threads; the 8645HS carries 6 cores and 12 threads. L1 cache is 64 KB per core on the 8645HS and 80 KB per core on the 9900X. L3 cache is 16 MB shared on the 8645HS and 64 MB on the 9900X. L2 cache is 1 MB per core on both.

Physical die layout differs. The 8645HS is a 178 mm² die with 25,000 million transistors. The 9900X is a 2x 70.6 mm² die configuration with 16,630 million transistors.

Feature differences complete the architectural picture. The 8645HS uses PCIe Gen 4 with 20 lanes and Radeon 760M integrated graphics. The 9900X uses PCIe Gen 5 with 24 lanes and Radeon Graphics integrated graphics. The 9900X also has an unlocked multiplier, while the 8645HS does not. These architecture differences align with the market positions: Mobile for the 8645HS, Desktop for the 9900X.