Intel Core i5-9400 vs Intel Xeon E5-2629 v3 Comparison

The Verdict

The Intel Xeon E5-2629 v3 is the stronger processor in every benchmark recorded, winning all six head-to-head tests against the Intel Core i5-9400. The Xeon's advantage ranges from 19% to 19.1% across Cinebench R15, R20, and R23 in both multi-core and single-core workloads. Despite being a 2014-era server part with a lower base clock, the Xeon's 8 cores and 16 threads overwhelm the Core i5's 6 cores and 6 threads in threaded tasks, while its higher single-core scores indicate superior per-thread efficiency in these specific tests. The Core i5-9400 does hold advantages in other areas—it is a newer Coffee Lake desktop part with a higher boost clock and lower TDP—but the benchmark data is unambiguous: the Xeon wins every compute test. The Core i5-9400 is the pick for a desktop build that needs integrated graphics, a smaller socket footprint, or lower power draw, but for raw Cinebench performance, the Xeon E5-2629 v3 is the clear winner.

FAQ

Q: Which CPU has more cores and threads?

A: The Intel Xeon E5-2629 v3 has 8 cores and 16 threads, while the Intel Core i5-9400 has 6 cores and 6 threads.

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

A: The Xeon E5-2629 v3 scores 7893 in Cinebench R23 multi-core, while the Core i5-9400 scores 6629, a 19.1% advantage for the Xeon.

Q: Does the Core i5-9400 have integrated graphics?

A: Yes, the Core i5-9400 includes Intel UHD 630 integrated graphics. The Xeon E5-2629 v3 has no integrated graphics listed.

Q: Which CPU supports ECC memory?

A: The Xeon E5-2629 v3 supports ECC memory, while the Core i5-9400 does not.

Q: What is the memory bandwidth difference?

A: The Xeon E5-2629 v3 has a quad-channel memory bus with 59.7 GB/s bandwidth, while the Core i5-9400 has a dual-channel bus with 42.7 GB/s bandwidth.

Q: Are both CPUs still in production?

A: Neither CPU is in production; both are listed as end-of-life.

Architecture Differences

The two processors come from different Intel generations and target different market segments. The Xeon E5-2629 v3 is built on the Haswell-EP architecture using a 22 nm process node, with the die size measured at 356 mm² and containing 2,600 million transistors. It is a server/workstation part designed for the Intel Socket 2011-3 platform. In contrast, the Core i5-9400 is a Coffee Lake desktop processor built on a 14 nm node, with no transistor count or die size data listed, and it fits the Intel Socket 1151 platform.

The Xeon's architecture supports both DDR3 and DDR4 memory via a quad-channel memory bus, delivering 59.7 GB/s of theoretical bandwidth. The Core i5-9400 supports only DDR4 through a dual-channel bus, with 42.7 GB/s of bandwidth. ECC memory is available on the Xeon but not on the Core i5. PCIe connectivity also differs: the Xeon provides 40 PCIe Gen 3 lanes (CPU-only), while the Core i5-9400 provides 16 PCIe Gen 3 lanes.

Cache hierarchies diverge significantly. Both share the same per-core L1 (64 KB) and L2 (256 KB) sizes, but the Xeon has a 20 MB shared L3 cache, compared to 9 MB on the Core i5. Integrated graphics are present only on the Core i5-9400 with its UHD 630, while the Xeon has no integrated graphics listed. The Xeon's market segment is server/workstation; the Core i5's is desktop.

Specification Differences

| Specification | Intel Xeon E5-2629 v3 | Intel Core i5-9400 |

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

| Cores | 8 | 6 |

| Threads | 16 | 6 |

| Base Clock | 2.40 GHz | 2.90 GHz |

| Boost Clock | 3.20 GHz | 4.10 GHz |

| TDP | 85 W | 65 W |

| Socket | Intel Socket 2011-3 | Intel Socket 1151 |

| Architecture | Haswell | Coffee Lake |

| Process Node | 22 nm | 14 nm |

| L3 Cache | 20 MB (shared) | 9 MB (shared) |

| Memory Support | DDR3, DDR4 | DDR4 |

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

| Memory Bandwidth | 59.7 GB/s | 42.7 GB/s |

| ECC Memory | Yes | No |

| PCIe Lanes (CPU) | Gen 3, 40 Lanes | Gen 3, 16 Lanes |

| Integrated Graphics | None | UHD 630 |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2014-09-07 | 2018-10-18 |

| Part Number | SR1XY | SR3X5 |

The Core i5-9400 has higher base and boost clocks—2.90 GHz and 4.10 GHz versus 2.40 GHz and 3.20 GHz—and a lower TDP of 65 W compared to 85 W. The Xeon counters with more cores, threads, cache, memory bandwidth, and PCIe lanes. The Core i5-9400 is the only one with integrated graphics and a newer release date.

Head-to-Head Benchmarks

The Xeon E5-2629 v3 sweeps every benchmark in the head-to-head comparison, winning all six tests with deltas between 19% and 19.1%. There is no single test where the Core i5-9400 comes out ahead.

In Cinebench R15 multi-core, the Xeon scores 795 against the Core i5-9400's 668, a 19% advantage. The single-core R15 test shows a 19.1% lead for the Xeon, with scores of 112 and 94 respectively. This is notable because the Core i5-9400 has a substantially higher boost clock of 4.10 GHz versus 3.20 GHz, yet the older Xeon still delivers higher single-threaded performance in this workload. The data indicates the Xeon's architecture extracts more work per clock in Cinebench R15.

The pattern holds in Cinebench R20. Multi-core results show the Xeon at 3315 versus 2784 for the Core i5-9400, a 19.1% gap. Single-core R20 again favors the Xeon, 467 to 392, also a 19.1% delta. These consistent margins across different Cinebench versions suggest a stable performance relationship between the two parts, rather than a workload-specific anomaly.

Cinebench R23 repeats the same story. The Xeon's multi-core score is 7893, while the Core i5-9400 manages 6629, a 19.1% difference. Single-core R23 shows the Xeon at 1114 versus 935, again 19.1% ahead. The uniformity of the delta—hovering at 19% or 19.1% across all tests—indicates that the performance gap is structural, likely stemming from the Xeon's dual-thread advantage per core plus its larger 20 MB L3 cache.

The Core i5-9400 has additional Geekbench scores not present for the Xeon in the data: 5141 multi-core and 1389 single-core. These are not directly comparable since the Xeon lacks corresponding Geekbench results, but they provide a reference point for the Core i5-9400's absolute performance level. In the recorded head-to-head tests, however, the Core i5-9400 wins zero benchmarks.

Average benchmark scores place the Xeon at 2283 and the Core i5-9400 at 2254, a difference of roughly 1.3%. Both CPUs sit at the 47th percentile among all CPUs. The Xeon's nearest rivals include the Intel Xeon D-1557 (avg 2282, 0% delta), Intel Core i3-10305 (avg 2264, 0.8% delta), and Intel Core i5-10400H (avg 2303, -0.9% delta). The Core i5-9400's nearest rivals include the Intel Core i7-1068NG7 (avg 2259, -0.2% delta), Intel Core i7-10710U (avg 2248, 0.3% delta), and AMD Ryzen 5 PRO 1500 (avg 2246, 0.4% delta).

The Xeon's six wins and zero losses in the head-to-head make it the definitive choice for applications that rely on Cinebench-style rendering performance. The Core i5-9400 remains a competent desktop part—its boost clock and integrated graphics give it platform versatility—but the benchmark evidence shows the Xeon E5-2629 v3 is the faster processor in every measured scenario. Given that both are end-of-life products, the decision hinges on platform needs: the Xeon offers server-grade memory bandwidth, ECC support, and more PCIe lanes, while the Core i5-9400 offers a lower-power, graphics-equipped desktop package. For pure compute, the Xeon wins outright.