Intel Core 3 305 vs Intel Core Ultra 3 205 Comparison

Head-to-Head Benchmarks

The recorded data shows a complete sweep in favor of the Intel Core Ultra 3 205 across all 17 head-to-head benchmark comparisons. The Core 3 305 does not win a single test, making this one of the most one-sided matchups in the database.

Starting with Cinebench results, the Core Ultra 3 205 delivers consistently higher scores. In Cinebench R15 multicore, the Ultra 3 205 scores 2001 against the Core 3 305's 1322, a 33.9% advantage. The single-core R15 test shows 282 versus 186, a 34% gap. Cinebench R20 follows the same pattern: multicore 8339 versus 5511 and single-core 1177 versus 777, both with identical 33.9% and 34% deltas respectively. Cinebench R23 multicore sees the Ultra 3 205 hit 19856 while the Core 3 305 manages 13123, again a 33.9% difference. The R23 single-core result is 2803 against 1852, matching the 33.9% deficit.

PassMark tests reveal even larger disparities in several workloads. Data compression shows the Ultra 3 205 at 260651 versus 146857, a 43.7% margin. Data encryption follows with 18772 against 11019, a 41.3% gap. Extended instructions score 22578 versus 13543, a 40% difference. The find prime numbers test produces the widest relative gap at 57.1%, with the Ultra 3 205 scoring 268 and the Core 3 305 scoring 115.

Floating point math shows 75136 versus 42284, a 43.7% lead. Integer math delivers 54755 against 32295, a 41% margin. Multithread performance is 26167 versus 15439, also 41% ahead. Physics testing shows 2016 versus 1233, a 38.8% advantage. Random string sorting produces 31083 against 17623, a 43.3% gap.

The closest contest appears in single-threaded PassMark tests, where the Ultra 3 205 scores 4575 versus 3977 for the Core 3 305, a narrower 13.1% edge. This smaller delta suggests the Core 3 305 has relatively competitive per-core performance, even though it still trails in every measured category.

The average benchmark score tells the broader story. The Core Ultra 3 205 sits at 31473 average, placing it in the 82nd percentile of all CPUs in the database. The Core 3 305 averages 18302, good for the 72nd percentile. That ten-point percentile gap indicates the Ultra 3 205 belongs in a distinctly higher performance tier.

Architecture Differences

The two processors come from different Intel design lineages. The Core 3 305 uses the Wildcat Lake codename and belongs to the Core 3 generation. The Core Ultra 3 205 uses the Arrow Lake architecture with the Arrow Lake-S codename, part of the Core Ultra Series 2 generation.

Both chips are fabricated on a 3 nm process node, but they use different foundries. The Core 3 305 is manufactured by Intel itself, while the Core Ultra 3 205 is built by TSMC. The Ultra 3 205 also discloses its transistor count at 17,800 million and die size at 243 mm², while the Core 3 305 does not publish either figure.

Core configuration differs substantially. The Core 3 305 has 6 cores and 6 threads, meaning no hyperthreading support. The Core Ultra 3 205 has 8 cores and 8 threads, also without simultaneous multithreading. The two extra physical cores in the Ultra 3 205 contribute directly to its multicore benchmark dominance.

Clock speeds favor the Ultra 3 205 as well. Its base clock runs at 3.80 GHz versus 1.50 GHz for the Core 3 305. Boost clocks are 4.90 GHz and 4.30 GHz respectively. The combination of two additional cores and higher clocks explains the consistent 34% or greater deficits in multi-threaded workloads.

Cache hierarchies show significant divergence. The Core 3 305 lists L1 cache at 192 KB total, L2 at 2.5 MB, and L3 at 6 MB shared. The Core Ultra 3 205 lists L1 at 192 KB per core, L2 at 3 MB per core, and L3 at 15 MB shared. With 8 cores, the Ultra 3 205's per-core cache design gives it approximately 24 MB of L2 aggregate and a much larger shared L3 pool.

Memory architecture differs markedly. The Core 3 305 supports both DDR5 and LPDDR5X memory but only through a single-channel bus, yielding 59.7 GB/s bandwidth. The Core Ultra 3 205 supports DDR5 through a dual-channel bus, delivering 102.4 GB/s. That bandwidth advantage nearly doubles what the Core 3 305 can access, which matters for memory-sensitive workloads.

PCIe connectivity also separates the two. The Core 3 305 provides Gen 4 with 6 CPU lanes. The Core Ultra 3 205 offers Gen 5 with 20 CPU lanes, giving it both newer and more numerous interconnect paths.

Integrated graphics take different approaches. The Core 3 305 uses Intel Xe3 Graphics with 1 Xe core. The Core Ultra 3 205 uses Arc Xe-LPG Graphics with 16 execution units. The 16EU configuration represents a more substantial graphics block, though the database does not provide graphics benchmark scores.

Power envelopes and sockets reflect their intended platforms. The Core 3 305 draws 15 W TDP and fits Intel BGA 1516, a mobile socket. The Core Ultra 3 205 draws 57 W TDP and uses Intel Socket 1851, a desktop platform. The production status for both is listed as Active.

Release timing differs by roughly nine months. The Core Ultra 3 205 launched on 2025-07-31, while the Core 3 305 appeared on 2026-04-15. The launch MSRP for the Core 3 305 is $309, and the Core Ultra 3 205 has a launch MSRP of $140.

FAQ

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

A: The Intel Core Ultra 3 205 leads in every single-core test. Cinebench R23 single-core shows 2803 versus 1852, a 33.9% advantage. PassMark single-thread shows 4575 versus 3977, a 13.1% edge. The Ultra 3 205's higher boost clock of 4.90 GHz versus 4.30 GHz supports this result.

Q: How much does the Core Ultra 3 205 lead in multi-threaded workloads?

A: Multi-threaded gaps range from 33.9% in Cinebench R15, R20, and R23 multicore tests to 41% in PassMark multithread. The Ultra 3 205 scores 26167 in PassMark multithread while the Core 3 305 scores 15439. The 8-core vs 6-core configuration explains much of this margin.

Q: What is the performance percentile difference between these two processors?

A: The Core Ultra 3 205 sits at the 82nd percentile of all CPUs in the database, while the Core 3 305 sits at the 72nd percentile. This ten-point gap places them in different performance tiers despite both being active products.

Q: Do these processors support ECC memory?

A: Neither processor supports ECC memory according to the database records.

Q: Which processor has higher memory bandwidth?

A: The Core Ultra 3 205 provides 102.4 GB/s through its dual-channel DDR5 bus. The Core 3 305 provides 59.7 GB/s through a single-channel bus that supports DDR5 and LPDDR5X. The Ultra 3 205 delivers roughly 72% more bandwidth.

Q: What are the socket requirements for each processor?

A: The Core 3 305 uses Intel BGA 1516, which is a mobile socket. The Core Ultra 3 205 uses Intel Socket 1851, which is a desktop socket. The Core Ultra 3 205 also supports PCIe Gen 5 with 20 CPU lanes, while the Core 3 305 has PCIe Gen 4 with 6 CPU lanes.

Specification Differences

| Specification | Intel Core 3 305 | Intel Core Ultra 3 205 |

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

| Cores | 6 | 8 |

| Threads | 6 | 8 |

| Base clock | 1.50 GHz | 3.80 GHz |

| Boost clock | 4.30 GHz | 4.90 GHz |

| TDP | 15 W | 57 W |

| Socket | Intel BGA 1516 | Intel Socket 1851 |

| Codename | Wildcat Lake | Arrow Lake-S |

| Generation | Core 3 (Wildcat Lake) | Ultra 3 (Arrow Lake) |

| Foundry | Intel | TSMC |

| Transistors | Not listed | 17,800 million |

| Die size | Not listed | 243 mm² |

| L1 cache | 192 KB | 192 KB per core |

| L2 cache | 2.5 MB | 3 MB per core |

| L3 cache | 6 MB shared | 15 MB shared |

| Memory support | DDR5, LPDDR5X | DDR5 |

| Memory bus | Single-channel | Dual-channel |

| Memory bandwidth | 59.7 GB/s | 102.4 GB/s |

| PCIe | Gen 4, 6 lanes | Gen 5, 20 lanes |

| Integrated graphics | Intel Xe3 Graphics (1 Xe) | Arc Xe-LPG Graphics 16EU |

| Market segment | Mobile | Desktop |

| Release date | 2026-04-15 | 2025-07-31 |

| Launch MSRP | $309 | $140 |

Where Each One Wins

The Intel Core Ultra 3 205 wins in every benchmark category recorded. Cinebench multicore tests show consistent 33.9% leads, and Cinebench single-core tests show 34% leads. PassMark tests show advantages ranging from 13.1% in single-thread performance to 57.1% in the find prime numbers test.

The Core Ultra 3 205 particularly excels in compute-heavy workloads. Data compression, floating point math, integer math, and extended instructions all show margins between 40% and 43.7%. The find prime numbers test, which stresses integer arithmetic and branch prediction, shows the largest relative gap at 57.1%.

The Core 3 305's closest performance comes in single-threaded PassMark results, where its 3977 score trails the Ultra 3 205's 4575 by only 13.1%. This indicates the Wildcat Lake design has competitive per-core execution efficiency, even though its lower clock speeds and fewer cores prevent it from closing the overall gap.

The Core 3 305's advantages lie outside raw compute benchmarks. Its 15 W TDP makes it suitable for power-constrained mobile designs. The BGA 1516 socket indicates a soldered mobile implementation. Memory flexibility includes both DDR5 and LPDDR5X support. Its integrated Xe3 Graphics uses a newer graphics architecture generation, though no graphics benchmarks are recorded.

The Core Ultra 3 205 offers a desktop platform with substantially higher memory bandwidth, PCIe Gen 5 connectivity, and 20 CPU lanes. Its dual-channel memory bus provides 102.4 GB/s versus 59.7 GB/s for the single-channel Core 3 305. The larger 15 MB shared L3 cache and per-core L2 design give it a structural advantage in workloads that benefit from larger caches.

The percentile data reinforces the performance separation. The Ultra 3 205's 82nd percentile places it near the Intel Core 7 240H, AMD Ryzen 9 5980HX, Intel Core Ultra 5 225H, and Intel Core i5-13500, all with average scores within 0.1% of its 31473. The Core 3 305's 72nd percentile aligns it with the Intel Core i3-14100, Intel Core 5 330, Intel Core 7 360, and AMD Ryzen 5 2600E, all within 0.4% of its 18302 average.

The Verdict

The benchmark data indicates the Intel Core Ultra 3 205 is the clearly superior processor in every measured performance category. It wins all 17 head-to-head tests, holds the higher percentile ranking at 82 versus 72, and delivers average benchmark scores of 31473 against 18302 for the Core 3 305.

For workloads that depend on CPU compute, the choice is unambiguous. Cinebench rendering, PassMark math operations, data compression, encryption, and physics simulations all favor the Core Ultra 3 205 by margins of at least 33.9% and often more than 40%. The 8-core, 8-thread Arrow Lake design with its 4.90 GHz boost clock and dual-channel memory subsystem provides the foundation for these results.

The Core 3 305 serves a different purpose. Its 15 W TDP, mobile BGA 1516 socket, and support for LPDDR5X memory position it for thin-and-light laptops where power efficiency matters more than peak throughput. Its 6-core Wildcat Lake design still delivers a 72nd percentile average score, which places it in company with the Intel Core i3-14100 and AMD Ryzen 5 2600E. Single-threaded PassMark performance at 3977 is within 13.1% of the Ultra 3 205, showing respectable per-core capability for daily tasks.

The Core Ultra 3 205 targets desktop users who need sustained multi-core performance. Its 57 W TDP and Socket 1851 platform support higher power delivery and better cooling. The PCIe Gen 5 interface with 20 lanes provides future-proofing for storage and expansion. The Arc Xe-LPG Graphics with 16 EU offers a more capable integrated graphics solution than the 1 Xe core in the Core 3 305.

Users selecting between these processors should consider the platform requirements first. The Core 3 305 requires a mobile motherboard with BGA 1516, while the Core Ultra 3 205 requires a desktop motherboard with Socket 1851. There is no overlap in compatibility. The launch MSRP of $309 for the Core 3 305 and $140 for the Core Ultra 3 205 reflects their different market positions, though the Core Ultra 3 205 delivers dramatically higher benchmark scores at a lower launch MSRP.

The database records show no scenario where the Core 3 305 outperforms the Core Ultra 3 205 in compute benchmarks. For maximum CPU performance, the Core Ultra 3 205 is the only choice supported by the data. For mobile systems where power draw is the primary constraint, the Core 3 305 provides a 15 W alternative with competitive single-threaded efficiency, though it concedes substantial multi-core capability.