CPU Comparison

The Intel Core i5-2500K and the Intel Celeron G6900E are separated by a decade of silicon evolution, yet the benchmark data shows a surprisingly consistent outcome. Across every single test in the head-to-head comparison, the Celeron G6900E finishes ahead. The most dramatic margin is in Geekbench single-core, where the G6900E scores 1561 against the i5-2500K's 805, a massive 48.4% advantage. That gap is not an outlier; it reflects a fundamental generational shift in IPC. Even in multi-threaded workloads, where the i5-2500K has double the cores and threads, the G6900E still wins. In Cinebench R23 multi-core, the G6900E scores 3632 versus 3523, a 3% lead, proving that two modern cores can outwork four older ones.

Head-to-Head Benchmarks

The Celeron G6900E sweeps all seven benchmark comparisons, but the wins are not uniform. The smallest margins appear in the Cinebench suite, where the G6900E's lead hovers around 3%. In Cinebench R15 multi-core, the G6900E posts 366 against the i5-2500K's 354, a 3.3% difference. The same pattern repeats in R20 multi-core (1525 vs 1479, 3% delta) and R23 multi-core (3632 vs 3523, 3% delta). Single-core Cinebench results are similarly close: R20 single-core shows 215 vs 208 (3.3% delta), and R23 single-core shows 512 vs 497 (2.9% delta). These results indicate that in pure rendering workloads, the i5-2500K's four physical cores nearly compensate for its architectural age, keeping the deficit to a few percentage points.

The Geekbench results tell a different story. Multi-core Geekbench gives the G6900E a 2702 score against 2434, a 9.9% lead. That is a more decisive margin than any Cinebench test, suggesting the G6900E's memory and cache architecture scale better in mixed integer workloads. The single-core Geekbench result is the headline: 1561 vs 805, a 48.4% blowout. This is not a marginal victory; it is a generational chasm. The i5-2500K's Sandy Bridge design, with its 32 nm process and older microarchitecture, simply cannot compete on per-thread performance. For any task that relies on a single fast core, web browsing, office apps, light scripting, the G6900E is in a different league. The average benchmark scores reflect this: the i5-2500K averages 1329 across all tests, while the G6900E averages 1321, a 0.6% difference favoring the i5-2500K in the aggregate, despite losing every head-to-head. That oddity stems from the i5-2500K having no single-core R15 score in the data, which skews its average.

Architecture Differences

The two CPUs come from opposite ends of Intel's design timeline. The i5-2500K is built on the 32 nm Sandy Bridge process, a 1,160 million transistor chip with a die size of 216 mm². The G6900E uses the 10 nm Alder Lake-S architecture, which is a far denser and more efficient design. The core counts differ sharply: the i5-2500K has 4 cores and 4 threads, while the G6900E has just 2 cores and 2 threads. Cache layouts reflect the generational leap. The i5-2500K offers 64 KB of L1 and 256 KB of L2 per core, with a shared 6 MB L3. The G6900E has 80 KB of L1 and a much larger 1.25 MB of L2 per core, but only 4 MB of shared L3. The larger per-core L2 on the G6900E helps explain its single-core dominance, as more data can stay closer to the execution units.

Memory support diverges completely. The i5-2500K is limited to DDR3 with a dual-channel bus and a peak bandwidth of 25.6 GB/s. The G6900E supports both DDR4 and DDR5 in dual-channel mode, with no bandwidth figure provided in the data, but the newer memory standards give it a clear platform advantage. PCIe connectivity also differs: the i5-2500K offers Gen 2 with 16 lanes from the CPU, while the G6900E provides Gen 5. That is a major practical difference for storage and GPU upgrades. The i5-2500K features Intel HD 3000 integrated graphics; the G6900E ships with UHD Graphics 710. The G6900E has a 46 W TDP against the i5-2500K's 95 W, making it far more power-efficient per unit of performance. The i5-2500K has an unlocked multiplier, enabling overclocking, while the G6900E is locked. Sockets are incompatible: the i5-2500K uses Intel Socket 1155, the G6900E uses Intel Socket 1700. The i5-2500K is end-of-life, released in January 2011 with a launch MSRP of $216; the G6900E is active, released in January 2022.

FAQ

Q: Which CPU has a higher single-core performance?

A: The Celeron G6900E wins decisively. In Geekbench single-core, it scores 1561 versus the i5-2500K's 805, a 48.4% lead. Cinebench R23 single-core also favors the G6900E, 512 vs 497, a 2.9% margin.

Q: Does the i5-2500K's extra core count help in multi-threaded tasks?

A: Not enough to win. Despite having 4 cores and 4 threads versus the G6900E's 2 cores and 2 threads, the i5-2500K loses every multi-core benchmark. In Cinebench R23 multi-core, the G6900E scores 3632 against 3523, a 3% lead.

Q: What is the power consumption difference?

A: The G6900E has a 46 W TDP, while the i5-2500K has a 95 W TDP. The G6900E draws less than half the power budget, making it substantially more efficient for sustained loads.

Q: Can the i5-2500K be overclocked?

A: Yes. The i5-2500K has an unlocked multiplier, so it can be overclocked. The G6900E has a locked multiplier and cannot be overclocked.

Q: Which CPU supports newer memory?

A: The G6900E supports DDR4 and DDR5 memory. The i5-2500K only supports DDR3. The G6900E also has a dual-channel memory bus, while the i5-2500K uses dual-channel DDR3 with a 25.6 GB/s bandwidth.

Q: How do their average benchmark scores compare?

A: The i5-2500K has an average benchmark score of 1329, while the G6900E scores 1321. The i5-2500K is 0.6% ahead in the aggregate, despite losing every head-to-head test, due to a missing R15 single-core score on the G6900E.

The Verdict

The data is unambiguous: the Celeron G6900E outperforms the i5-2500K in every direct benchmark. The i5-2500K's sole statistical advantage is its 0.6% higher average benchmark score, which is an artifact of incomplete data. For any new build, the G6900E is the better processor. Its single-core performance is nearly double in Geekbench, and it maintains a lead even in multi-threaded rendering workloads despite having half the cores. The G6900E also offers modern platform features, DDR5 support, PCIe Gen 5, a 46 W TDP, that the i5-2500K cannot match. The i5-2500K retains one niche: overclocking. With an unlocked multiplier, it can be pushed beyond its 3.70 GHz boost clock, potentially closing some gaps, but the data as tested shows no scenario where it wins. The i5-2500K is end-of-life, while the G6900E is active and supported. For a practical builder, the choice is the G6900E unless you specifically require the i5-2500K's legacy socket or overclocking headroom.

Specification Differences

| Specification | Intel Core i5-2500K | Intel Celeron G6900E |

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

| Cores | 4 | 2 |

| Threads | 4 | 2 |

| Base Clock | 3.30 GHz | 3.00 GHz |

| Boost Clock | 3.70 GHz | None |

| TDP | 95 W | 46 W |

| Socket | Intel Socket 1155 | Intel Socket 1700 |

| Architecture | Sandy Bridge | Alder Lake |

| Process Node | 32 nm | 10 nm |

| Transistors | 1,160 million | Not specified |

| Die Size | 216 mm² | Not specified |

| L1 Cache | 64 KB (per core) | 80 KB (per core) |

| L2 Cache | 256 KB (per core) | 1.25 MB (per core) |

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

| Memory Support | DDR3 | DDR4, DDR5 |

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

| Memory Bandwidth | 25.6 GB/s | Not specified |

| PCIe | Gen 2, 16 Lanes (CPU only) | Gen 5 |

| Integrated Graphics | Intel HD 3000 | UHD Graphics 710 |

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

| Release Date | 2011-01-08 | 2022-01-03 |

| Launch MSRP | $216 | Not specified |

| Multiplier Unlocked | Yes | No |

Where Each One Wins

The G6900E wins everywhere in the benchmark data. It takes all seven head-to-head tests, including the multi-core Cinebench suite where the i5-2500K's core count advantage might have been expected to show. The G6900E is the clear choice for any workload measured: rendering, general computing, and single-threaded tasks. Its single-core Geekbench score of 1561 versus 805 makes it the superior option for applications that are latency-sensitive or depend on one fast thread. The i5-2500K's only theoretical win condition is overclocking, which the data does not cover. With an unlocked multiplier, a user could push it beyond stock clocks to narrow or potentially reverse some gaps, but the stock results show no such victory. The i5-2500K also has a higher base clock (3.30 GHz vs 3.00 GHz) and a boost clock (3.70 GHz) that the G6900E lacks entirely, but these do not translate into benchmark wins. For a modern system, the G6900E is the pick. For a retro build or a platform that requires Socket 1155, the i5-2500K remains a capable option, but it is strictly inferior in the measured tests. The G6900E's lower TDP and newer platform features make it the more practical recommendation for any new purchase.