AMD Ryzen 3 3100U vs AMD Ryzen Embedded 8645HS Comparison

Head-to-Head Benchmarks

The recorded database does not contain direct head-to-head benchmark comparisons between the AMD Ryzen 3 3100U and the AMD Ryzen Embedded 8645HS. The head-to-head benchmark field is empty, with zero wins recorded for either processor. This means a direct score-by-score comparison cannot be drawn from the available measurements.

However, the Ryzen 3 3100U has a full set of PassMark benchmark results, while the Ryzen Embedded 8645HS has no recorded benchmark scores at all. The 3100U's average benchmark score is 6,247, placing it in the 62nd percentile among all CPUs in the database. Its nearest rivals include the AMD Ryzen Threadripper 1950X with an average score of 6,231 and a delta of 0.3%, the AMD EPYC 7272 at 6,186 with a delta of 1%, the Intel Core i9-10920X at 6,347 with a delta of -1.6%, and the Intel Core i9-7940X at 6,147 with a delta of 1.6%. These deltas indicate the 3100U sits within roughly 1.6% of these high-core-count desktop and server parts, which is a notable outcome for a 2-core mobile processor.

The 3100U's individual scores show a wide spread across workloads. The data compression test yields 38,455, which is the highest single score in its benchmark suite. Floating point math produces 5,854, integer math reaches 8,873, and extended instructions score 2,116. The multithread score is 3,348, while single-thread performance is recorded at 1,592 in both the passmark_single_thread and passmark_singlethread entries, confirming consistency. The find prime numbers test returns only 18, which is the lowest score and indicates a weakness in that specific workload. Random string sorting scores 4,666, data encryption scores 1,972, and physics scores 232.

Because the 8645HS has no benchmark data, the database cannot confirm whether it outperforms the 3100U in any specific test. The only quantitative comparison available is the percentile placement: the 3100U ranks at the 62nd percentile, while the 8645HS ranks at the 50th percentile. This suggests that, based on the database's overall ranking method, the 3100U is positioned higher relative to all CPUs, but this is not a direct head-to-head measurement and should be interpreted cautiously given the 8645HS's absence of recorded scores.

Architecture Differences

The two processors come from different generations and manufacturing nodes. The Ryzen 3 3100U belongs to the 3000 series, uses the Picasso codename, and is built on the Zen+ architecture. It is fabricated on a 12 nm process at GlobalFoundries, with a transistor count of 4,940 million and a die size of 210 mm². The Ryzen Embedded 8645HS belongs to the 8000 series, uses the Hawk Point codename, and is built on the Zen 4 architecture. It is fabricated on a 4 nm process at TSMC, with a transistor count of 25,000 million and a die size of 178 mm². The node shrink from 12 nm to 4 nm and the foundry change from GlobalFoundries to TSMC represent major manufacturing differences.

Core and thread counts differ substantially. The 3100U has 2 cores and 2 threads, meaning no simultaneous multithreading. The 8645HS has 6 cores and 12 threads, indicating simultaneous multithreading support. Clock speeds also differ: the 3100U has a base clock of 1.90 GHz and a boost clock of 3.20 GHz, while the 8645HS operates at a base clock of 4.30 GHz and a boost clock of 5.00 GHz. The 8645HS's base clock alone exceeds the 3100U's boost clock by 1.10 GHz.

Cache hierarchies are different in size and allocation. The 3100U provides 96 KB of L1 cache per core, 512 KB of L2 per core, and 4 MB of shared L3 cache. The 8645HS provides 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3 cache. While the per-core L1 is smaller on the 8645HS, the L2 is double per core and the L3 is four times larger overall. Neither processor has 3D V-Cache.

Memory support and bandwidth diverge sharply. The 3100U supports DDR4 memory on a dual-channel bus, delivering 38.4 GB/s of memory bandwidth, and does not support ECC memory. The 8645HS supports DDR5 memory on a dual-channel bus, delivering 89.6 GB/s of memory bandwidth, and does support ECC memory. The 8645HS offers more than double the memory bandwidth of the 3100U and adds ECC capability, which is relevant for embedded and reliability-focused applications.

PCIe generations also differ. The 3100U uses PCIe Gen 3, while the 8645HS uses PCIe Gen 4 with 20 lanes available to the CPU. Integrated graphics differ as well: the 3100U uses Radeon Vega 8, while the 8645HS uses Radeon 760M. The sockets are incompatible: the 3100U uses AMD Socket FP5, and the 8645HS uses AMD Socket FP8. The 3100U has a TDP of 15 watts, while the 8645HS has a TDP of 45 watts. Neither processor has an unlocked multiplier. The 3100U's part number is YM3100C4T2OFG, while the 8645HS's part number is unknown. The 3100U's release date is recorded as 2026-05-31, while the 8645HS's release date is 2024-04-01.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen Embedded 8645HS has 6 cores and 12 threads, while the AMD Ryzen 3 3100U has 2 cores and 2 threads. The 8645HS provides triple the core count and six times the thread count.

Q: What is the memory bandwidth difference?

A: The 8645HS delivers 89.6 GB/s of memory bandwidth with DDR5 support, while the 3100U delivers 38.4 GB/s with DDR4 support. The 8645HS has more than double the bandwidth.

Q: Does the Ryzen Embedded 8645HS support ECC memory?

A: Yes, the 8645HS supports ECC memory. The Ryzen 3 3100U does not support ECC memory.

Q: What are the process nodes for each processor?

A: The 3100U is built on a 12 nm process at GlobalFoundries, while the 8645HS is built on a 4 nm process at TSMC. The 8645HS also has a much higher transistor count at 25,000 million compared to 4,940 million.

Q: Which processor has a higher boost clock?

A: The 8645HS has a boost clock of 5.00 GHz, compared to the 3100U's boost clock of 3.20 GHz. The 8645HS's base clock of 4.30 GHz is also higher than the 3100U's boost clock.

Q: Are the benchmark scores available for both processors?

A: No. The 3100U has a full set of PassMark scores with an average of 6,247, while the 8645HS has no recorded benchmark scores in the database.

The Verdict

The data indicates a clear generational and performance-class separation between these two processors. The Ryzen 3 3100U is a low-power mobile part with 2 cores, a 15-watt TDP, and a 12 nm Zen+ design. Its benchmark results show respectable scores for its class, particularly in data compression at 38,455 and integer math at 8,873. Its 62nd percentile ranking among all CPUs, despite having only 2 threads, suggests efficiency in the workloads it does handle.

The Ryzen Embedded 8645HS is a higher-power embedded part with 6 cores, 12 threads, a 45-watt TDP, and a 4 nm Zen 4 design. It offers substantially more compute resources, higher clock speeds, more cache, faster memory, and ECC support. However, the database contains no benchmark scores for this processor, so its actual performance cannot be quantified from the recorded data. The 50th percentile ranking is unverified against measured scores.

For workloads where the 3100U has recorded wins, such as data compression and floating point math, the data supports its capability in those areas. For the 8645HS, the absence of measurements means any performance claim would be speculative. The database shows that the 3100U is positioned higher in percentile ranking, but this must be weighed against the 8645HS's architectural advantages, which are substantial on paper.

Specification Differences

| Specification | AMD Ryzen 3 3100U | AMD Ryzen Embedded 8645HS |

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

| Series | 3000 series | 8000 series |

| Cores | 2 | 6 |

| Threads | 2 | 12 |

| Base Clock | 1.90 GHz | 4.30 GHz |

| Boost Clock | 3.20 GHz | 5.00 GHz |

| TDP | 15 W | 45 W |

| Socket | AMD Socket FP5 | AMD Socket FP8 |

| Architecture | Zen+ (Picasso) | Zen 4 (Hawk Point) |

| Process Node | 12 nm | 4 nm |

| Foundry | GlobalFoundries | TSMC |

| Transistors | 4,940 million | 25,000 million |

| Die Size | 210 mm² | 178 mm² |

| L1 Cache | 96 KB (per core) | 64 KB (per core) |

| L2 Cache | 512 KB (per core) | 1 MB (per core) |

| L3 Cache | 4 MB (shared) | 16 MB (shared) |

| Memory Support | DDR4 | DDR5 |

| Memory Bus | Dual-channel | Dual-channel |

| Memory Bandwidth | 38.4 GB/s | 89.6 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 3 | Gen 4, 20 Lanes (CPU only) |

| Integrated Graphics | Radeon Vega 8 | Radeon 760M |

| Market Segment | Mobile | Mobile |

| Production Status | Active | Active |

| Release Date | 2026-05-31 | 2024-04-01 |

| Multiplier Unlocked | No | No |

| Part Number | YM3100C4T2OFG | Unknown |

Where Each One Wins

The Ryzen 3 3100U wins in scenarios where low power consumption and compact design matter. Its 15-watt TDP is one third of the 8645HS's 45-watt TDP, making it suitable for thin-and-light mobile systems where thermal and battery constraints are primary. Its benchmark scores, including the 38,455 data compression result, demonstrate that it can handle compression and integer workloads without requiring significant power. The 62nd percentile ranking suggests it performs well relative to the broader CPU population, even with only 2 threads. Its 210 mm² die size, while larger than the 8645HS's 178 mm², is paired with a much lower transistor count, which may simplify manufacturing costs in volume.

The Ryzen Embedded 8645HS wins in scenarios that demand higher throughput and reliability. Its 6 cores and 12 threads provide triple the parallel execution capacity. The base clock of 4.30 GHz and boost clock of 5.00 GHz give it a decisive clock-speed advantage. The 16 MB L3 cache is four times larger, and the 89.6 GB/s memory bandwidth is more than double. ECC memory support makes it appropriate for embedded systems where data integrity is critical. The 4 nm process at TSMC, with 25,000 million transistors, represents a more advanced fabrication technology. PCIe Gen 4 with 20 CPU lanes offers faster peripheral connectivity compared to the 3100U's PCIe Gen 3. The 8645HS also has a smaller die size at 178 mm², which may offer better transistor density.

The 3100U is the only one of the two with recorded benchmark results, so it wins in the category of verified performance data. The 8645HS has no scores in the database, leaving its measured performance unconfirmed. For users prioritizing proven benchmark numbers, the 3100U has the advantage. For users prioritizing architectural capability, the 8645HS is the clear choice based on specifications alone.