Intel Core i5-6500T vs Intel Xeon E3-1226 v3 Comparison

FAQ

Q: Which processor has the higher average benchmark score, the Intel Core i5-6500T or the Intel Xeon E3-1226 v3?

A: The Intel Core i5-6500T averages 1362 points, while the Intel Xeon E3-1226 v3 averages 1357 points. The i5-6500T leads by a negligible 0.4% in this aggregate metric, effectively a statistical tie.

Q: How does the Xeon E3-1226 v3 perform in the Cinebench R23 multi-core test compared to the i5-6500T?

A: The Xeon E3-1226 v3 scores 4692 points versus the i5-6500T's 4054 points. This represents a 13.6% advantage for the Xeon, which is its consistent margin across all six head-to-head benchmark comparisons.

Q: Does the Intel Xeon E3-1226 v3 support ECC memory?

A: Yes, the Xeon E3-1226 v3 supports ECC memory, a feature typically reserved for server and workstation platforms. The Intel Core i5-6500T does not support ECC memory.

Q: What are the power consumption figures for these two CPUs?

A: The Intel Core i5-6500T has a TDP of 35 watts, while the Intel Xeon E3-1226 v3 has a TDP of 84 watts. The i5-6500T draws less than half the power of the Xeon.

Q: Which processor has the higher boost clock speed?

A: The Intel Xeon E3-1226 v3 boosts to 3.70 GHz, whereas the Intel Core i5-6500T boosts to 3.10 GHz. The Xeon's base clock is also higher at 3.30 GHz versus 2.50 GHz for the i5.

Q: How many benchmark wins does each processor have in the head-to-head comparison?

A: The Intel Xeon E3-1226 v3 wins all six head-to-head benchmark tests. The Intel Core i5-6500T records zero wins across the Cinebench R15, R20, and R23 multi-core and single-core tests.

Architecture Differences

The two processors come from different architectural generations and process nodes. The Intel Core i5-6500T is built on Skylake architecture using a 14 nm process node, while the Intel Xeon E3-1226 v3 uses the older Haswell-WS architecture on a 22 nm node. This generational gap explains several key differences in their design and feature sets.

The Xeon E3-1226 v3 features a larger die size of 160 mm² compared to the i5-6500T's 122 mm². The Xeon also contains 1,400 million transistors, a figure not listed for the i5-6500T. Cache configurations differ as well: both have 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the Xeon has 8 MB of shared L3 cache versus 6 MB on the i5-6500T.

Memory support is another point of divergence. The i5-6500T supports both DDR3 and DDR4 memory across a dual-channel bus, delivering 34.1 GB/s of memory bandwidth. The Xeon E3-1226 v3 supports only DDR3, also on a dual-channel bus, with 25.6 GB/s of memory bandwidth. The Xeon's ECC memory support is a significant architectural feature that the i5-6500T lacks, reflecting its server/workstation heritage.

Both processors integrate graphics, but with different implementations. The i5-6500T includes HD Graphics 530, while the Xeon E3-1226 v3 includes Intel HD P4600. Both use the same PCIe configuration: Gen 3 with 16 lanes available from the CPU. Neither processor has an unlocked multiplier, and both are classified as end-of-life products from Intel.

Where Each One Wins

The benchmark data is unambiguous: the Intel Xeon E3-1226 v3 wins every single performance test. In the six head-to-head comparisons, the Xeon consistently outperforms the i5-6500T by approximately 13.6% to 13.7% across both single-core and multi-core workloads. This suggests the Xeon holds a clear advantage in CPU-bound tasks, whether those tasks scale across all four cores or rely on a single thread's performance.

The i5-6500T's strengths lie not in raw benchmark scores but in efficiency and platform flexibility. With a TDP of just 35 watts versus the Xeon's 84 watts, the i5-6500T is suited for low-power or thermally constrained builds where the workload is light and energy consumption matters more than peak throughput. Its support for both DDR3 and DDR4 memory offers a wider range of compatible platforms, potentially making it easier to integrate into different system configurations.

The Xeon E3-1226 v3 excels in scenarios where ECC memory is required or preferred, such as entry-level servers, workstations, or data-integrity-sensitive environments. Its higher clock speeds and larger L3 cache provide a measurable performance edge in both multi-threaded rendering and single-threaded tasks, as demonstrated across the Cinebench suite.

Specification Differences

| Specification | Intel Core i5-6500T | Intel Xeon E3-1226 v3 |

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

| Base Clock | 2.50 GHz | 3.30 GHz |

| Boost Clock | 3.10 GHz | 3.70 GHz |

| TDP | 35 W | 84 W |

| Socket | Intel Socket 1151 | Intel Socket 1150 |

| Architecture | Skylake | Haswell |

| Codename | Skylake | Haswell-WS |

| Generation | Core i5 (Skylake) | Xeon E3 (Haswell-WS) |

| Process Node | 14 nm | 22 nm |

| Die Size | 122 mm² | 160 mm² |

| Transistors | Not listed | 1,400 million |

| L3 Cache | 6 MB (shared) | 8 MB (shared) |

| Memory Support | DDR3, DDR4 | DDR3 |

| Memory Bandwidth | 34.1 GB/s | 25.6 GB/s |

| ECC Memory | No | Yes |

| Integrated Graphics | HD Graphics 530 | Intel HD P4600 |

| Market Segment | Desktop | Server/Workstation |

| Release Date | 2015-07-01 | 2014-05-10 |

| Launch MSRP | Not listed | $213 |

Both processors share identical core and thread counts (4 cores, 4 threads), L1 and L2 cache sizes, dual-channel memory bus, PCIe configuration, and lack of an unlocked multiplier. The differences above highlight how the Xeon trades power efficiency for clock speed and server-oriented features.

Head-to-Head Benchmarks

The head-to-head results form a consistent pattern: the Intel Xeon E3-1226 v3 outperforms the Intel Core i5-6500T by roughly the same margin in every test. Starting with Cinebench R15 multi-core, the Xeon scores 472 against the i5's 408, a 13.6% advantage. The single-core R15 test shows the same 13.6% gap, with scores of 66 and 57 respectively.

Moving to Cinebench R20, the Xeon maintains its dominance. In multi-core, the Xeon scores 1970 versus the i5's 1702, again a 13.6% difference. The single-core R20 test shows the Xeon at 278 and the i5 at 240, a slightly larger 13.7% margin. This near-identical percentage across different workloads suggests the Xeon's advantage is uniform rather than workload-specific.

The most modern test in the comparison, Cinebench R23, follows the same trajectory. The Xeon's multi-core score of 4692 beats the i5's 4054 by 13.6%. In single-core, the Xeon scores 662 against the i5's 572, another 13.6% gap.

The average benchmark scores tell a different story. The i5-6500T averages 1362 points across its full benchmark suite, which includes Geekbench multi-core (2843) and single-core (1016) results. The Xeon averages 1357 points but lacks these Geekbench entries in its data set. Within the nearest rivals, the i5-6500T and Xeon E3-1226 v3 sit within 0.4% of each other's average scores, with the i5 slightly ahead. This positions them as near-peers in overall performance, despite the Xeon's consistent wins in the Cinebench suite.

The Verdict

The choice between these two processors depends entirely on the priority of performance versus efficiency. The Intel Xeon E3-1226 v3 wins every benchmark test in the head-to-head comparison, with a consistent 13.6% to 13.7% margin across Cinebench R15, R20, and R23 in both single-core and multi-core workloads. For users who need maximum CPU throughput, regardless of power consumption, the Xeon is the clear pick. Its ECC memory support adds further appeal for server or workstation use cases where data integrity is critical.

The Intel Core i5-6500T, despite losing all six benchmarks, offers a dramatically lower power envelope at 35 watts versus 84 watts. It also supports both DDR3 and DDR4 memory, providing more flexibility in system building. For users who prioritize low power draw, quieter operation, or smaller form factors, the i5-6500T's efficiency advantage may outweigh its performance deficit. Its average benchmark score of 1362 is essentially identical to the Xeon's 1357, indicating that in a broader performance context, the two are far closer than the Cinebench results suggest.

The data shows no scenario where the i5-6500T wins a performance test. Users should select the Xeon E3-1226 v3 if raw compute performance, ECC memory support, or server-grade features are required. Users should select the i5-6500T if power efficiency, newer process technology, or DDR4 memory compatibility takes precedence. Both processors are end-of-life products with no unlocked multipliers, so overclocking is not a consideration for either.