Intel Core i5-7400T vs Intel Xeon E3-1226 v3 Comparison

The Intel Xeon E3-1226 v3 and the Intel Core i5-7400T are both quad-core, quad-thread processors, but the benchmark data shows they are not equal in performance. The Xeon E3-1226 v3, despite being an older Haswell-era part, wins every single head-to-head benchmark in the Cinebench suite. The i5-7400T, a Kaby Lake chip with a much lower TDP and clock speed, cannot match the raw output of the Xeon. This is a clear case where architecture generation matters less than the specific positioning of the parts: the Xeon is a server/workstation chip with a higher power envelope, while the i5-7400T is a power-sipping desktop part.

Head-to-Head Benchmarks

The data is unambiguous: the Intel Xeon E3-1226 v3 is the faster processor in every single benchmark recorded. Across the entire Cinebench suite, the Xeon consistently outperforms the Core i5-7400T by a margin of approximately 17.7% to 17.9%. There are zero wins for the i5-7400T in the six head-to-head comparisons, making the overall performance hierarchy clear.

In Cinebench R15, the Xeon scores 472 points in the multi-core test versus the i5-7400T’s 401 points, a 17.7% advantage. The single-core delta in the same test is slightly larger: the Xeon’s 66 points beat the i5-7400T’s 56 points by 17.9%. This pattern holds exactly when moving to newer test versions. In Cinebench R20, the multi-core score is 1970 for the Xeon and 1672 for the i5-7400T, a 17.8% gap. The single-core R20 scores are 278 and 236, respectively, again a 17.8% difference.

The most recent test suite, Cinebench R23, shows the same consistency. The Xeon produces a multi-core score of 4692 against the i5-7400T’s 3981, a 17.9% lead. Single-core R23 results are 662 for the Xeon and 562 for the i5-7400T, another 17.8% gap. The near-identical deltas across all tests indicate that the performance difference is not workload-specific; it is a fundamental throughput advantage that scales uniformly across single-threaded and multi-threaded tasks. The average benchmark score reinforces this: the Xeon sits at 1357, while the i5-7400T is at 1348.

Looking at the broader competitive landscape, the Xeon’s average score places it essentially neck-and-neck with the Intel Core i5-6500T (1362, delta -0.3%) and the Intel Core i5-8365UE (1362, delta -0.4%). The i5-7400T’s average score is also closely matched with the Intel Xeon W-2104 (1350, delta -0.1%). However, when the two are compared directly, the Xeon E3-1226 v3 has an average score that is 0.6% higher than the i5-7400T. This statistical edge, combined with the decisive wins in every Cinebench test, shows that the Xeon is the superior performer for raw compute, even though both processors occupy the same 36th percentile relative to all CPUs.

Where Each One Wins

The benchmark results grant the Intel Xeon E3-1226 v3 a total of six wins, while the Intel Core i5-7400T records zero wins. This is a complete sweep. The Xeon’s victories span every category that Cinebench tests, covering both single-core and multi-core performance across three different software versions (R15, R20, and R23). There is no scenario in the data where the i5-7400T comes out ahead.

For users prioritizing maximum processing speed in rendering or CPU-intensive calculations, the Xeon E3-1226 v3 is the clear choice. Its consistent 17.8% lead in multi-core tests means tasks that scale across cores will finish substantially faster. The single-core advantage of roughly 17.8% also matters for applications that rely heavily on one thread, such as older games or lightly threaded productivity software. The i5-7400T, in contrast, offers no performance advantage in any measured metric.

The i5-7400T’s only implicit strength is its much lower thermal design power. The Xeon has a TDP of 84 watts, while the i5-7400T has a TDP of just 35 watts. This makes the i5-7400T a more suitable candidate for compact, low-noise, or passively cooled systems where heat output is a primary concern. However, this efficiency comes at the cost of the significant performance deficit seen in the benchmarks. If the workload is purely about speed, the i5-7400T has no wins to offer. If the workload is about fitting into a strict power budget, the i5-7400T becomes the only viable option, but that is a system design choice, not a performance victory.

Architecture Differences

The two processors come from different Intel architectures and are built for different platforms. The Xeon E3-1226 v3 is based on the Haswell architecture, specifically the Haswell-WS codename, and uses a 22 nm process node. It integrates 1,400 million transistors on a 160 mm² die. The Core i5-7400T is a Kaby Lake part built on a 14 nm process. The fact pack does not list transistor count or die size for the i5-7400T. The Xeon uses the Intel Socket 1150, while the i5-7400T uses the Intel Socket 1151, meaning they are not interchangeable on the same motherboard.

Cache configuration differs notably. Both have 64 KB of L1 cache per core and 256 KB of L2 cache per core. The key difference is in the L3 cache: the Xeon has 8 MB shared, while the i5-7400T has 6 MB shared. This 2 MB difference in shared cache can help the Xeon in workloads that benefit from a larger pool of cached data. The i5-7400T’s base clock is 2.40 GHz with a boost clock of 3.00 GHz, whereas the Xeon runs at a base of 3.30 GHz and boosts to 3.70 GHz. The Xeon’s higher clocks are a direct contributor to its benchmark dominance.

Memory support is another area of divergence. The Xeon supports DDR3 memory with a dual-channel bus and a maximum bandwidth of 25.6 GB/s. The i5-7400T supports DDR4 memory, also dual-channel, but with a higher maximum bandwidth of 38.4 GB/s. The i5-7400T’s newer memory standard offers more theoretical bandwidth, but this does not translate into a benchmark win. Additionally, the Xeon supports ECC memory, which is a critical feature for error-correcting workloads in server environments; the i5-7400T does not. Integrated graphics also differ: the Xeon has Intel HD P4600, while the i5-7400T has HD 630. Both use PCIe Gen 3 with 16 lanes from the CPU.

The market positioning is stark. The Xeon is classified for the Server/Workstation segment and is marked as end-of-life, released in May 2014 with a launch MSRP of $213. The i5-7400T is a Desktop part, is still active in production, and was released in January 2017. The i5-7400T has no launch MSRP listed. Neither processor has an unlocked multiplier.

FAQ

Q: Which processor has the higher clock speed?

A: The Intel Xeon E3-1226 v3 has a base clock of 3.30 GHz and a boost clock of 3.70 GHz. The Intel Core i5-7400T has a base clock of 2.40 GHz and a boost clock of 3.00 GHz.

Q: Does the Intel Core i5-7400T win any Cinebench benchmark?

A: No. The head-to-head data shows the Intel Xeon E3-1226 v3 wins all six Cinebench tests, including multi-core and single-core variants of R15, R20, and R23.

Q: What is the L3 cache difference between the two?

A: The Intel Xeon E3-1226 v3 has 8 MB of shared L3 cache, while the Intel Core i5-7400T has 6 MB of shared L3 cache.

Q: Which processor supports ECC memory?

A: The Intel Xeon E3-1226 v3 supports ECC memory. The Intel Core i5-7400T does not support ECC memory.

Q: Are these processors compatible with the same motherboard socket?

A: No. The Intel Xeon E3-1226 v3 uses Intel Socket 1150, while the Intel Core i5-7400T uses Intel Socket 1151.

Q: How much faster is the Xeon in Cinebench R23 multi-core?

A: The Intel Xeon E3-1226 v3 scores 4692, which is 17.9% higher than the Intel Core i5-7400T’s score of 3981.

Specification Differences

| Specification | Intel Xeon E3-1226 v3 | Intel Core i5-7400T |

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

| Base Clock | 3.30 GHz | 2.40 GHz |

| Boost Clock | 3.70 GHz | 3.00 GHz |

| TDP | 84 W | 35 W |

| Socket | Intel Socket 1150 | Intel Socket 1151 |

| Architecture | Haswell (Haswell-WS) | Kaby Lake |

| Process Node | 22 nm | 14 nm |

| Transistors | 1,400 million | N/A |

| Die Size | 160 mm² | N/A |

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

| Memory Support | DDR3 | DDR4 |

| Memory Bandwidth | 25.6 GB/s | 38.4 GB/s |

| ECC Memory | Yes | No |

| Integrated Graphics | Intel HD P4600 | HD 630 |

| Market Segment | Server/Workstation | Desktop |

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

| Release Date | 2014-05-10 | 2017-01-02 |

| Launch MSRP | $213 | N/A |

| Part Number | SR1R0 | SR332 |

The Verdict

The data directs a clear verdict: choose the Intel Xeon E3-1226 v3 if you need absolute performance. It wins every single benchmark, with a consistent 17.8% lead in both single-core and multi-core tests. Its higher base and boost clocks, combined with a larger 8 MB L3 cache, translate into tangible speed advantages that the i5-7400T cannot overcome. The Xeon’s support for ECC memory also makes it the only viable choice for systems where data integrity is non-negotiable. Its average benchmark score of 1357 is measurably higher than the i5-7400T’s 1348, and it even edges out the Xeon W-2104 by 0.5%.

Choose the Intel Core i5-7400T only if you are constrained by thermals or power. Its 35-watt TDP is less than half of the Xeon’s 84-watt envelope, making it suitable for ultra-compact builds or silent operation. It also supports faster DDR4 memory with a higher theoretical bandwidth of 38.4 GB/s. However, this comes at the cost of a performance deficit of nearly 18% in all tested workloads, and it lacks ECC support. The i5-7400T is a capable desktop processor, but it is not a competitor to the Xeon in raw compute. The Xeon is the winner on every metric that measures speed; the i5-7400T only wins on efficiency and platform modernity.