AMD Ryzen 5 40 vs Intel Core Ultra 3 205 Comparison

The AMD Ryzen 5 40 and Intel Core Ultra 3 205 occupy very different corners of the processor market, and the benchmark data confirms a wide performance gulf between them. Across all 15 recorded head-to-head comparisons, the Intel Core Ultra 3 205 takes the win, with the AMD part trailing by margins ranging from roughly 41% to over 92%. These are not close contests; they represent a fundamental difference in performance class, target platform, and design philosophy.

Head-to-Head Benchmarks

The most decisive victory for the Intel Core Ultra 3 205 comes in the Passmark find prime numbers test, where it scores 268 against the Ryzen 5 40's 20, a delta of -92.5%. This test is heavily dependent on integer throughput and clock speed, and the Intel part's higher base and boost clocks, combined with its newer architecture, simply overwhelm the older Zen 2 design.

In multi-threaded workloads, the Intel chip is equally dominant. The Cinebench R23 multi-core result shows the Ultra 3 205 at 19,856 versus 4,841 for the Ryzen 5 40, a -75.6% delta. The Cinebench R15 multi-core test tells the same story: 2,001 for Intel against 790 for AMD, a -60.5% margin. The Passmark multi-thread score of 26,167 for Intel versus 9,341 for AMD (-64.3%) reinforces that the Core Ultra 3 205 delivers more than double the parallel processing capability in most tests.

Single-thread performance also favors Intel, though by a smaller relative margin. The Cinebench R23 single-core result is 2,803 for the Ultra 3 205 versus 1,150 for the Ryzen 5 40, a -59% delta. The Passmark single-thread score shows 4,575 against 2,477, a -45.9% difference. The Cinebench R15 single-core test records 282 for Intel and 165.5 for AMD, a -41.3% margin, which is the smallest gap in the entire dataset. Even so, the Intel processor holds a commanding lead in every single-threaded metric.

The gap narrows somewhat in integer-heavy workloads but remains substantial. Passmark integer math scores 54,755 for Intel versus 31,598 for AMD, a -42.3% delta. Data compression shows 260,651 for Intel against 141,533 for AMD, a -45.7% margin. The Intel part also leads in floating-point math by a wide margin: 75,136 versus 15,194, a -79.8% delta. Extended instructions and data encryption follow the same pattern, with Intel leading by -71.5% and -64.6% respectively. Random string sorting, a memory-latency-sensitive test, shows Intel at 31,083 versus 15,124 for AMD, a -51.3% delta.

Physics simulation, often a proxy for gaming and scientific workloads, heavily favors Intel: 2,016 versus 432, a -78.6% delta. Across all 15 benchmarks, the AMD Ryzen 5 40 records zero wins. The Intel Core Ultra 3 205 wins every single comparison, with an average benchmark score of 31,473 versus 15,882 for the AMD part, placing the Intel chip in the 82nd percentile of all CPUs compared to the 70th percentile for the AMD chip.

Architecture Differences

The two processors are built on fundamentally different architectures and process nodes. The AMD Ryzen 5 40 uses the Zen 2 architecture under the Mendocino codename, fabricated on a 6 nm process at TSMC. The Intel Core Ultra 3 205 uses the Arrow Lake architecture, specifically Arrow Lake-S, on a 3 nm process, also from TSMC. This process advantage alone explains a significant portion of the performance gap, as the smaller node allows for higher clock speeds and better power efficiency.

The core configuration differs substantially. The AMD part has 4 cores and 8 threads, while the Intel part has 8 cores and 8 threads. This means the Intel chip has twice the physical core count but no hyper-threading, while the AMD chip relies on simultaneous multithreading to reach 8 threads from 4 cores. In practice, the Intel part's 8 physical cores outperform the AMD part's 4 cores with SMT across all multi-threaded benchmarks.

Cache hierarchies are also very different. The AMD Ryzen 5 40 has 64 KB of L1 cache per core, 512 KB of L2 per core, and a shared 4 MB L3 cache. The Intel Core Ultra 3 205 has 192 KB of L1 per core, 3 MB of L2 per core, and a shared 15 MB L3 cache. The Intel part's larger per-core L2 and much larger shared L3 cache give it a significant advantage in workloads that repeatedly access the same data.

Clock speeds favor Intel as well. The AMD part has a base clock of 2.80 GHz and a boost clock of 4.30 GHz. The Intel part has a base clock of 3.80 GHz and a boost clock of 4.90 GHz. The higher base clock is particularly important for sustained workloads, while the higher boost clock helps with bursty single-threaded tasks.

Memory support also differs. The AMD Ryzen 5 40 supports LPDDR5 memory with dual-channel configuration and a memory bandwidth of 88.0 GB/s. The Intel Core Ultra 3 205 supports DDR5 memory, also dual-channel, but with a higher memory bandwidth of 102.4 GB/s. Neither part supports ECC memory.

PCIe connectivity is another point of divergence. The AMD part provides PCIe Gen 3 with 4 lanes (CPU only), while the Intel part provides PCIe Gen 5 with 20 lanes (CPU only). This gives the Intel chip significantly more bandwidth and expansion capability for discrete GPUs or NVMe storage.

The integrated graphics differ as well. The AMD Ryzen 5 40 uses a Radeon 610M, while the Intel Core Ultra 3 205 uses Arc Xe-LPG Graphics with 16 execution units. The Intel part's newer graphics architecture is expected to offer better media and compute performance, though no direct graphics benchmarks are in the database.

The market segments are distinct: the AMD part is a mobile processor on AMD Socket FT6, while the Intel part is a desktop processor on Intel Socket 1851. The TDPs reflect this: 15 watts for the AMD mobile part versus 57 watts for the Intel desktop part. The AMD part has a smaller die size at 100 mm², while the Intel part has a larger die at 243 mm². The Intel part also has a transistor count of 17,800 million, a figure not provided for the AMD part.

FAQ

Q: Which processor has the higher multi-core performance?

A: The Intel Core Ultra 3 205 wins every multi-threaded benchmark. In Cinebench R23 multi-core, it scores 19,856 versus 4,841 for the AMD Ryzen 5 40, a -75.6% delta. The Passmark multi-thread score is 26,167 for Intel versus 9,341 for AMD, a -64.3% delta.

Q: Is the AMD Ryzen 5 40 more efficient despite lower performance?

A: The AMD part has a TDP of 15 watts compared to 57 watts for the Intel part. The AMD chip is designed for mobile use with a 6 nm process, while the Intel chip is a desktop part on a 3 nm process. The database does not include power consumption measurements, so efficiency ratios cannot be calculated.

Q: What is the single-thread performance gap?

A: The Intel Core Ultra 3 205 leads by -59% in Cinebench R23 single-core (2,803 versus 1,150), by -45.9% in Passmark single-thread (4,575 versus 2,477), and by -41.3% in Cinebench R15 single-core (282 versus 165.5). The gap is smallest in the R15 test.

Q: Which processor has more cache?

A: The Intel Core Ultra 3 205 has a shared 15 MB L3 cache, 3 MB of L2 per core, and 192 KB of L1 per core. The AMD Ryzen 5 40 has a shared 4 MB L3 cache, 512 KB of L2 per core, and 64 KB of L1 per core.

Q: Do both processors support ECC memory?

A: No. Neither the AMD Ryzen 5 40 nor the Intel Core Ultra 3 205 supports ECC memory.

Q: Which processor has a higher memory bandwidth?

A: The Intel Core Ultra 3 205 has a memory bandwidth of 102.4 GB/s with DDR5 support. The AMD Ryzen 5 40 has 88.0 GB/s with LPDDR5 support. Both are dual-channel configurations.

Specification Differences

The table below lists only the fields where the two processors differ according to the database.

| Specification | AMD Ryzen 5 40 | Intel Core Ultra 3 205 |

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

| Series | None | Core Ultra Series 2 |

| Manufacturer | AMD | Intel |

| Cores | 4 | 8 |

| Threads | 8 | 8 |

| Base Clock | 2.80 GHz | 3.80 GHz |

| Boost Clock | 4.30 GHz | 4.90 GHz |

| TDP | 15 W | 57 W |

| Socket | AMD Socket FT6 | Intel Socket 1851 |

| Architecture | Zen 2 | Arrow Lake |

| Codename | Mendocino | Arrow Lake-S |

| Generation | Ryzen 5 (Zen 2 Mendocino) | Ultra 3 (Arrow Lake) |

| Process Node | 6 nm | 3 nm |

| Foundry | TSMC | TSMC |

| Transistors | Not provided | 17,800 million |

| Die Size | 100 mm² | 243 mm² |

| L1 Cache | 64 KB per core | 192 KB per core |

| L2 Cache | 512 KB per core | 3 MB per core |

| L3 Cache | 4 MB shared | 15 MB shared |

| Memory Support | LPDDR5 | DDR5 |

| Memory Bandwidth | 88.0 GB/s | 102.4 GB/s |

| PCIe | Gen 3, 4 Lanes (CPU only) | Gen 5, 20 Lanes (CPU only) |

| Integrated Graphics | Radeon 610M | Arc Xe-LPG Graphics 16EU |

| Market Segment | Mobile | Desktop |

| Release Date | 2025-09-30 | 2025-07-31 |

| Part Number | Unknown | SRVFC |

| Launch MSRP | Not provided | $140 |

Where Each One Wins

The Intel Core Ultra 3 205 wins in every benchmark category recorded in the database. It is faster in all single-threaded and multi-threaded tests, all Passmark sub-tests, and all Cinebench versions. The Intel part's 8 physical cores, higher clock speeds, larger cache, and newer 3 nm process give it an across-the-board advantage in compute performance.

The AMD Ryzen 5 40 has no benchmark wins in this dataset. Its advantages are contextual rather than performance-based. It is a mobile processor with a 15 W TDP, making it suitable for thin-and-light laptops where power draw and heat dissipation are primary constraints. It uses LPDDR5 memory, which is common in mobile designs, and it has a much smaller die size at 100 mm², which may reduce manufacturing cost per wafer. The AMD part also uses PCIe Gen 3 with 4 lanes, which is sufficient for basic mobile I/O.

The Intel Core Ultra 3 205 is a desktop processor with a 57 W TDP and a $140 launch MSRP. It provides PCIe Gen 5 with 20 lanes, allowing for high-bandwidth expansion. Its 17,800 million transistors and 243 mm² die size reflect a much more complex design. The Intel part's higher memory bandwidth of 102.4 GB/s and larger L3 cache of 15 MB make it better suited for memory-intensive desktop workloads.

The data shows a clear segmentation: the AMD Ryzen 5 40 serves the low-power mobile market, while the Intel Core Ultra 3 205 serves the mainstream desktop market. The performance gap is expected given the different TDP budgets, core counts, and process nodes. The Intel part's 82nd percentile ranking versus the AMD part's 70th percentile confirms that the Intel chip sits in a higher overall performance tier. For any workload where raw compute throughput matters, the Intel Core Ultra 3 205 is the choice. The AMD part's role is limited to power-constrained mobile environments where its 15 W TDP is a requirement.