Intel Core i3-1005G1 vs Intel Core i5-2500 Comparison

The Intel Core i3-1005G1 and the Intel Core i5-2500 represent two very different eras of Intel's product stack. The i3-1005G1 is a modern, low-power mobile chip built on Ice Lake, while the i5-2500 is a legacy desktop part from the Sandy Bridge generation. The recorded benchmark data shows a clear, consistent winner across every single test, but the reasons behind that victory are rooted in architecture and platform differences that go far beyond a simple core count comparison. This analysis breaks down the data to show where each processor wins, why the newer chip dominates, and who should consider which part based strictly on the recorded measurements.

Where Each One Wins

The head-to-head benchmark results are unambiguous: the Intel Core i3-1005G1 wins all seven recorded tests, with the Intel Core i5-2500 failing to secure a single victory. The i3-1005G1's dominance is most pronounced in single-threaded workloads, where its modern architecture delivers a massive advantage. In Geekbench single-core, the i3-1005G1 scores 1083 against the i5-2500's 670, a 61.6% delta. This is the largest gap between the two in any test and highlights how much single-thread performance has improved across generations.

In multi-core workloads, the gap narrows but still favors the i3-1005G1. The i5-2500 has four physical cores against the i3-1005G1's two, but the newer chip's efficiency and higher instructions per clock make up for the core deficit. In Cinebench R23 multi-core, the i3-1005G1 scores 4070 versus 3479 for the i5-2500, a 17% advantage. The Geekbench multi-core test shows the smallest difference between the two, with the i3-1005G1 scoring 1978 and the i5-2500 scoring 1883, a 5% lead. This makes sense: the older chip's four cores can partially offset the newer chip's architectural edge in a test that scales with core count.

The i3-1005G1 also wins every Cinebench iteration, both R15, R20, and R23, across multi-core and single-core variants. The deltas are remarkably consistent, hovering around 17% for all Cinebench tests except the Geekbench single-core outlier. The i5-2500's only competitive showing is in Geekbench multi-core, where it trails by just 95 points. That result indicates that when a workload can fully utilize all four cores, the older processor remains relevant, but it cannot match the newer chip's per-thread efficiency.

Architecture Differences

The i3-1005G1 is built on Intel's 10 nm process, while the i5-2500 uses the 32 nm node. This process shrink is the foundation of the performance gap. The newer chip's Sunny Cove architecture is designed for high efficiency and high single-thread throughput, while Sandy Bridge, the i5-2500's architecture, is a much older design with lower instructions per clock.

Core counts differ significantly: the i3-1005G1 has 2 cores and 4 threads, while the i5-2500 has 4 cores and 4 threads. Despite having half the physical cores, the i3-1005G1 still wins multi-core tests, which speaks to the efficiency of its architecture and its higher boost clock behavior relative to its base clock. The i3-1005G1 has a base clock of 1200 MHz and a boost clock of 3.40 GHz, while the i5-2500 runs at a base of 3.30 GHz and boosts to 3.70 GHz. The newer chip's ability to boost aggressively from a low base is typical of modern mobile parts.

Cache configurations also differ. The i3-1005G1 has 64 KB L1 and 256 KB L2 per core, with 4 MB of shared L3. The i5-2500 has the same L1 and L2 per core but a larger 6 MB shared L3. The larger L3 on the older chip does not compensate for the architectural deficit in the recorded benchmarks.

Memory support is another major split. The i3-1005G1 uses DDR4 with dual-channel memory and a recorded bandwidth of 51.2 GB/s. The i5-2500 uses DDR3, also dual-channel, but no bandwidth figure is recorded. The newer platform's faster memory contributes to its overall performance advantage.

The i3-1005G1 is a mobile part with a 15 W TDP, while the i5-2500 is a desktop chip with a 95 W TDP. The i5-2500 draws over six times the power yet still loses every benchmark. The i3-1005G1's integrated graphics are UHD Graphics, while the i5-2500 has Intel HD 2000. The i3-1005G1 uses the Intel BGA 1526 socket, while the i5-2500 uses the older Intel Socket 1155. The i3-1005G1 is still in active production, while the i5-2500 is end-of-life.

Head-to-Head Benchmarks

The data shows a clean sweep for the i3-1005G1. In Cinebench R15 multi-core, the i3-1005G1 scores 410 against the i5-2500's 350, a 17.1% advantage. This is the largest Cinebench delta in the entire comparison and shows that even with fewer cores, the newer architecture wins in a rendering workload.

Cinebench R20 multi-core shows a nearly identical story: the i3-1005G1 scores 1709, the i5-2500 scores 1461, a 17% lead. The single-core variant of R20 also goes to the i3-1005G1, with 241 points versus 206, again a 17% margin. This consistency across R15 and R20 suggests the performance gap is stable regardless of the workload's intensity.

Cinebench R23 reinforces the pattern. Multi-core has the i3-1005G1 at 4070 and the i5-2500 at 3479, a 17% delta. Single-core R23 has the newer chip at 574 versus 491, a 16.9% lead. These numbers show that the i3-1005G1's advantage is not a fluke of one test but a systemic feature of its architecture.

The Geekbench results are where the biggest divergence appears. In single-core, the i3-1005G1 scores 1083, which is 61.6% higher than the i5-2500's 670. This is the single largest performance gap in the entire dataset and demonstrates the massive generational improvement in single-thread performance. The multi-core Geekbench test shows the smallest gap: 1978 for the i3-1005G1 versus 1883 for the i5-2500, a 5% difference. This test is the only one where the i5-2500 comes close, and it highlights that the older chip's four cores can still compete when the workload scales well.

Overall, the i3-1005G1 records an average benchmark score of 1265, placing it in the 35th percentile of all CPUs. The i5-2500 averages 1220, placing it in the 34th percentile. The difference in average score is 45 points, which is small, but the head-to-head deltas tell a more complete story.

The Verdict

The data is clear: the Intel Core i3-1005G1 is the superior processor in every recorded benchmark. It wins all seven head-to-head tests, with the smallest margin being 5% in Geekbench multi-core and the largest being 61.6% in Geekbench single-core. The i5-2500 cannot claim a single victory.

The i3-1005G1 is the right choice for anyone who prioritizes single-thread performance, modern efficiency, and a platform that is still in active production. Its 10 nm process, DDR4 memory support, and 15 W TDP make it a far more practical option for modern workloads. The i5-2500, with its 95 W TDP and DDR3 memory, is a relic of a different era. It only makes sense if you have a legacy Socket 1155 motherboard and need a quad-core part for basic multi-threaded tasks, but even then, the benchmark data shows it loses in every category.

The i5-2500's only redeeming quality is its four physical cores, which keep it competitive in the Geekbench multi-core test. But that single close result does not outweigh the 17% to 61.6% deficits in every other test. For any new build, the i3-1005G1 is the only rational choice based on the recorded data. For an existing Sandy Bridge system, the i5-2500 is still functional, but it is objectively slower in every measured workload.

FAQ

Q: Which processor wins in single-core performance?

A: The Intel Core i3-1005G1 wins decisively. In Geekbench single-core, it scores 1083 against the i5-2500's 670, a 61.6% advantage. In Cinebench R23 single-core, it scores 574 versus 491, a 16.9% lead.

Q: Does the i5-2500's four cores beat the i3-1005G1's two cores in multi-core tests?

A: No. Despite having twice the physical cores, the i5-2500 loses all multi-core tests. In Cinebench R23 multi-core, the i3-1005G1 scores 4070 against the i5-2500's 3479, a 17% advantage. The smallest multi-core gap is in Geekbench, where the i3-1005G1 leads 1978 to 1883.

Q: What is the biggest performance difference between the two?

A: The largest gap is in Geekbench single-core, where the i3-1005G1 outperforms the i5-2500 by 61.6%. This is nearly four times larger than the smallest recorded delta of 5%.

Q: Which processor has a higher base clock?

A: The i5-2500 has a higher base clock at 3.30 GHz, while the i3-1005G1 runs at 1.20 GHz. However, the i3-1005G1 boosts to 3.40 GHz, which is close to the i5-2500's 3.70 GHz boost, and still wins all benchmarks.

Q: Are these processors in the same performance percentile?

A: They are very close. The i3-1005G1 sits in the 35th percentile of all CPUs, while the i5-2500 sits in the 34th percentile. Their average benchmark scores are 1265 and 1220, respectively.

Q: Which processor is still being manufactured?

A: The Intel Core i3-1005G1 is listed as active in production, while the Intel Core i5-2500 is end-of-life. This means the i3-1005G1 is the only one of the two that is currently available as a new part.

Specification Differences

| Specification | Intel Core i3-1005G1 | Intel Core i5-2500 |

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

| Cores | 2 | 4 |

| Threads | 4 | 4 |

| Base Clock | 1200 MHz | 3.30 GHz |

| Boost Clock | 3.40 GHz | 3.70 GHz |

| TDP | 15 W | 95 W |

| Socket | Intel BGA 1526 | Intel Socket 1155 |

| Architecture | Ice Lake | Sandy Bridge |

| Process Node | 10 nm | 32 nm |

| Die Size | 123 mm² | 216 mm² |

| Transistors | Not recorded | 1,160 million |

| L3 Cache | 4 MB (shared) | 6 MB (shared) |

| Memory Support | DDR4 | DDR3 |

| Memory Bandwidth | 51.2 GB/s | Not recorded |

| PCIe | Gen 3 | Gen 3, 16 Lanes (CPU only) |

| Integrated Graphics | UHD Graphics | Intel HD 2000 |

| Market Segment | Mobile | Desktop |

| Production Status | Active | End-of-life |

| Release Date | 2019-07-31 | 2011-01-08 |