Intel Core 3 100U vs Intel Core Ultra 5 250KF Plus Comparison

Head-to-Head Benchmarks

The data records 17 benchmark comparisons between the Intel Core 3 100U and the Intel Core Ultra 5 250KF Plus. The Ultra 5 wins all 17. The margins, however, vary dramatically by workload, which reveals the character of each processor.

The largest single-core gap appears in Cinebench R23 single-core, where the Ultra 5 scores 6030 against the Core 3's 1499, a 75.1% deficit for the smaller chip. The same pattern holds across Cinebench R15 and R20 single-core tests, with deltas of 75.3% and 75.2% respectively. This consistency suggests the Ultra 5's clock advantage, not just its core count, drives the single-threaded performance.

Multi-core results show a similar but slightly less severe delta. Cinebench R23 multi-core has the Ultra 5 at 42718 versus 10624, a 75.1% difference. Cinebench R15 and R20 multi-core both sit at 75.1% deltas as well. The near-identical percentages across all Cinebench versions indicate the performance gap scales uniformly with thread count and frequency, not with any test-specific quirk.

PassMark integer math tells a different story. Here the Ultra 5 scores 123030 against 39580, a 67.8% delta, the smallest margin in the entire set. Integer math often responds to raw core count and memory bandwidth, and the Ultra 5's lead narrows because the Core 3's eight threads still execute integer operations efficiently relative to its other weaknesses.

The widest gap belongs to PassMark find prime numbers. The Ultra 5 scores 452 versus 52, an 88.5% delta. Prime number finding is heavily dependent on cache hierarchy and branch prediction, and the Ultra 5's larger L2 and L3 caches appear to dominate. PassMark extended instructions shows an 81.6% delta, with scores of 42880 and 7894, indicating the Ultra 5's newer instruction execution pipeline offers a substantial advantage in AVX and similar workloads.

Floating-point math shows an 82.3% delta (159824 versus 28322), while random string sorting shows 77.4% (67209 versus 15191). Data compression shows 75.3% (553155 versus 136497), and encryption shows 80.3% (41292 versus 8128). The encryption gap is notable because it exceeds the average delta, suggesting the Ultra 5's AES-NI implementation, paired with its higher memory bandwidth of 115.2 GB/s, handles cryptographic workloads disproportionately well.

PassMark multi-thread shows a 75% delta (50146 versus 12522), and physics shows 72.5% (3183 versus 876). The physics result is interesting because it falls below the Cinebench multi-core delta, implying the Ultra 5's advantage in integer-heavy physics calculations is slightly less pronounced than in pure rendering workloads.

Single-thread PassMark scores show the smallest delta of all: 25.4% (4698 versus 3506). This is a crucial data point. While the Ultra 5 still wins decisively, the Core 3's single-thread PassMark score is far closer to the Ultra 5 than any Cinebench single-core result suggests. The PassMark single-thread suite includes memory and disk components, which narrows the CPU-only gap.

The average benchmark score confirms the overall picture: the Ultra 5 averages 66159, while the Core 3 averages 16148. That is a 4.1x difference in aggregate throughput. The percentile ranking places the Ultra 5 at 93rd percentile among all CPUs, versus the Core 3's 70th percentile.

Architecture Differences

The two processors come from entirely different design generations. The Core 3 100U uses Raptor Lake-U architecture on a 10 nm process, fabricated by Intel. The Ultra 5 250KF Plus uses Arrow Lake Refresh architecture on a 3 nm process, fabricated by TSMC. The process node difference alone explains much of the performance and efficiency gap.

Core counts diverge sharply. The Core 3 has 6 cores and 8 threads, meaning it uses a hybrid layout with some cores lacking hyperthreading. The Ultra 5 has 18 cores and 18 threads, a fully homogeneous design with no hyperthreading at all. The Ultra 5's 3x core count directly feeds its multi-core dominance.

Cache sizes scale with the architectural leap. The Core 3 has 80 KB L1 per core, 1.25 MB L2 per core, and 10 MB shared L3. The Ultra 5 has 192 KB L1 per core, 3 MB L2 per core, and 30 MB shared L3. The L3 difference is 3x, matching the core count ratio. The per-core L2 difference is 2.4x, which helps the Ultra 5 in workloads that fit in L2.

Clock speeds favor the Ultra 5 as well. Base clock is 4.20 GHz versus 1.20 GHz, and boost clock is 5.30 GHz versus 4.70 GHz. The base clock gap is enormous, reflecting the mobile versus desktop positioning. The boost clock gap is smaller but still significant at 0.6 GHz.

Memory support differs. The Core 3 supports both DDR4 and DDR5 in dual-channel configuration, while the Ultra 5 supports DDR5 only, also dual-channel. The Ultra 5's memory bandwidth is listed at 115.2 GB/s, a figure not recorded for the Core 3. ECC memory support is absent on the Core 3 but present on the Ultra 5, which aligns with the Ultra 5's desktop and workstation aspirations.

PCIe connectivity shows a generational jump. The Core 3 uses PCIe Gen 4 with 8 lanes from the CPU. The Ultra 5 uses PCIe Gen 5 with 20 lanes. That is both a bandwidth and lane count increase, enabling more expansion cards and faster storage.

Integrated graphics separate the two completely. The Core 3 includes UHD Graphics 64EU, while the Ultra 5 has no integrated graphics at all. The Core 3's iGPU makes it a self-contained mobile solution, whereas the Ultra 5 requires a discrete GPU.

The Ultra 5 lists 17,800 million transistors on a 243 mm² die. No transistor or die size data exists for the Core 3. The Ultra 5 also has an unlocked multiplier, while the Core 3 does not, meaning the Ultra 5 supports overclocking.

Socket and market segment differ fundamentally. The Core 3 uses Intel BGA 1744, a soldered mobile socket, and targets the mobile market. The Ultra 5 uses Intel Socket 1851, a desktop socket, and targets desktop systems. The Core 3's TDP is 15 watts, while the Ultra 5's TDP is 125 watts, an 8.3x difference in power envelope.

Release dates are nearly two years apart. The Core 3 launched on January 7, 2024, while the Ultra 5 launched on March 10, 2026. Both remain in active production.

Where Each One Wins

The Core 3 100U wins no benchmark in the recorded data. Its only advantages are qualitative: it has integrated graphics, supports both DDR4 and DDR5, and draws far less power at 15 watts TDP. For systems that need a GPU without a discrete card, or for platforms constrained to mobile sockets, the Core 3 is the only choice between the two.

The Ultra 5 250KF Plus wins every measured performance test. Its largest margins come in prime number finding, extended instructions, floating-point math, and encryption, where the deltas exceed 80%. These workloads benefit from the Ultra 5's larger caches, newer instruction support, and higher memory bandwidth.

The Ultra 5's smallest margin is in PassMark single-thread, at 25.4%. Even here, the score of 4698 versus 3506 represents a clear win, but the relative closeness suggests the Core 3's single-core architecture is not as far behind as the Cinebench numbers imply. The Core 3's boost clock of 4.70 GHz is respectable, and its Raptor Lake cores retain competitive single-thread IPC.

For multi-threaded rendering, the Ultra 5's Cinebench R23 score of 42718 positions it near CPUs like the AMD Ryzen 9 7950X3D, which the database lists at an average score of 65914 with a delta of 0.4% relative to the Ultra 5. The Core 3's Cinebench R23 score of 10624 places it near the Intel Core i7-1260U, which has an average score of 16320, a delta of 1.1% relative to the Core 3. These nearest rival comparisons show that the Core 3 competes in the mobile ultrabook class, while the Ultra 5 competes in the high-end desktop class.

The data implies a clear use-case split. The Core 3 suits light mobile workloads: office tasks, media playback, and any scenario where battery life and low heat matter. Its integrated graphics eliminate the need for a discrete GPU. The Ultra 5 suits desktop workloads that demand maximum throughput: video rendering, scientific computation, data compression, and encryption-heavy tasks. Its lack of integrated graphics forces a discrete GPU, but its 20 PCIe Gen 5 lanes provide ample bandwidth for high-end graphics cards.

The Verdict

The benchmark data leaves no ambiguity in raw performance. The Intel Core Ultra 5 250KF Plus outperforms the Intel Core 3 100U in every single recorded test, with deltas ranging from 25.4% to 88.5%. The average benchmark score difference, 66159 versus 16148, confirms a processor that is roughly four times faster in aggregate.

However, the two chips serve entirely different markets. The Core 3 is a mobile processor with a 15 watt TDP, integrated graphics, and a BGA socket. The Ultra 5 is a desktop processor with a 125 watt TDP, no integrated graphics, and a socketed LGA design. No user would realistically choose between them for the same build, because they are not interchangeable.

For a mobile laptop or a compact system that relies on integrated graphics, the Core 3 is the only viable option between the two. Its 70th percentile ranking shows it is a capable mid-range mobile processor, competitive with the Intel Core i7-10850H and Core i5-10600KF in aggregate score.

For a desktop system with a discrete GPU, the Ultra 5 is the clear choice. Its 93rd percentile ranking places it among the top CPUs in the database, alongside the AMD Ryzen 9 7950X3D and Intel Core 9 273PQE. The 30 MB L3 cache, 115.2 GB/s memory bandwidth, and PCIe Gen 5 support provide a platform that can handle demanding workloads without bottlenecking.

The data also shows that the Ultra 5's single-thread advantage is real but not overwhelming in every test. The 25.4% delta in PassMark single-thread suggests that for lightly threaded applications, the Core 3 is not as far behind as multi-core tests imply. But for any workload that scales across cores, the Ultra 5's 18 cores versus 6 cores creates an insurmountable gap.

The Core 3's 0.3% delta versus the Intel Core i7-10850H and 0.5% versus the Core i5-10600KF shows it sits in a competitive mobile tier. The Ultra 5's 0.1% delta versus the Core 9 273PQE and 0.4% versus the Ryzen 9 7950X3D shows it sits in the upper echelon of desktop CPUs. The verdict is straightforward: the Ultra 5 wins on every performance metric, but the Core 3 wins on integration and power efficiency, making the choice dependent entirely on platform and workload.

FAQ

Q: Which processor has a higher single-core score in Cinebench R23?

A: The Intel Core Ultra 5 250KF Plus scores 6030, while the Intel Core 3 100U scores 1499, a 75.1% difference in favor of the Ultra 5.

Q: Does the Core 3 100U have integrated graphics?

A: Yes, the Core 3 100U includes UHD Graphics 64EU. The Core Ultra 5 250KF Plus has no integrated graphics and requires a discrete GPU.

Q: What is the difference in core count between the two processors?

A: The Core 3 100U has 6 cores and 8 threads. The Core Ultra 5 250KF Plus has 18 cores and 18 threads.

Q: Which processor supports ECC memory?

A: The Core Ultra 5 250KF Plus supports ECC memory. The Core 3 100U does not.

Q: What are the release dates for both processors?

A: The Core 3 100U was released on January 7, 2024. The Core Ultra 5 250KF Plus was released on March 10, 2026.

Q: What is the TDP of each processor?

A: The Core 3 100U has a TDP of 15 watts. The Core Ultra 5 250KF Plus has a TDP of 125 watts.

Q: Which processor has a higher boost clock?

A: The Core Ultra 5 250KF Plus boosts to 5.30 GHz, while the Core 3 100U boosts to 4.70 GHz.

Q: What is the largest benchmark delta between the two?

A: The largest delta is in PassMark find prime numbers, where the Ultra 5 scores 452 versus 52, an 88.5% difference.

Specification Differences

| Specification | Intel Core 3 100U | Intel Core Ultra 5 250KF Plus |

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

| Cores | 6 | 18 |

| Threads | 8 | 18 |

| Base Clock | 1.20 GHz | 4.20 GHz |

| Boost Clock | 4.70 GHz | 5.30 GHz |

| TDP | 15 W | 125 W |

| Socket | Intel BGA 1744 | Intel Socket 1851 |

| Architecture | Raptor Lake | Arrow Lake Refresh |

| Process Node | 10 nm | 3 nm |

| Foundry | Intel | TSMC |

| Transistors | Not listed | 17,800 million |

| Die Size | Not listed | 243 mm² |

| L1 Cache | 80 KB (per core) | 192 KB (per core) |

| L2 Cache | 1.25 MB (per core) | 3 MB (per core) |

| L3 Cache | 10 MB (shared) | 30 MB (shared) |

| Memory Support | DDR4, DDR5 | DDR5 |

| Memory Bandwidth | Not listed | 115.2 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 4, 8 Lanes (CPU only) | Gen 5, 20 Lanes (CPU only) |

| Integrated Graphics | UHD Graphics 64EU | N/A |

| Market Segment | Mobile | Desktop |

| Launch MSRP | $426 | $184 |

| Multiplier Unlocked | No | Yes |

| Release Date | 2024-01-07 | 2026-03-10 |