Intel Core i5-8400T vs Intel Xeon E3-1260L v5 Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep, with the Intel Xeon E3-1260L v5 winning all six direct comparisons against the Intel Core i5-8400T. The margins are remarkably consistent across every workload, which points to a systematic advantage rather than a single-test artifact.

In Cinebench R15 multi-core, the Xeon scores 707 against the i5's 633, a lead of 11.7%. The single-core result in the same test follows the same pattern: 99 versus 89, a 11.2% advantage. This is notable because single-core performance typically favors newer architectures with higher boost clocks, yet the older Skylake part holds a decisive edge here.

Moving to Cinebench R20, the Xeon posts 2946 multi-core and 415 single-core, while the i5-8400T manages 2638 and 372 respectively. The deltas are 11.7% and 11.6%, nearly identical to the R15 margins. This consistency across different Cinebench versions suggests the performance gap is stable regardless of the rendering engine's specific workload characteristics.

Cinebench R23 confirms the trend with the largest absolute numbers: the Xeon reaches 7015 multi-core and 990 single-core, versus 6282 and 886 for the i5. The delta remains at 11.7% for both metrics. In percentage terms, the Xeon's advantage hovers between 11.2% and 11.7% across all six tests, an unusually tight band that indicates a fundamental throughput difference.

The i5-8400T does have additional Geekbench scores in the database: 4011 multi-core and 1100 single-core. However, since the Xeon lacks corresponding Geekbench results, these cannot be directly compared in the head-to-head table. The six available comparisons all favor the Xeon, giving it a 6-0 win record.

It is worth remembering the i5-8400T has two more physical cores (6 versus 4) and a higher thread count only if hyper-threading is considered, but in practice the i5 has 6 threads versus the Xeon's 8. Despite the core deficit, the Xeon's higher clock speeds and hyper-threading allow it to outperform in every recorded rendering benchmark. The i5's base clock is listed as 1700.00, which is notably lower than the Xeon's 2.90 GHz base, and its boost of 3.30 GHz trails the Xeon's 3.90 GHz boost.

Architecture Differences

The two processors come from different architectural generations and target different market segments. The Xeon E3-1260L v5 is based on Skylake, with the codename Skylake-DT, and belongs to the Xeon E3 (Skylake-DT) generation. It was released in October 2015 and is classified as a Server/Workstation part. The i5-8400T uses Coffee Lake, carries the same codename, and belongs to the Core i5 (Coffee Lake) generation, released in April 2018 as a Desktop processor. Both are built on the same 14 nm process node at Intel's foundry, but the die sizes differ: the Xeon measures 122 mm² with 1,750 million transistors, while the i5 has a larger 154 mm² die with no transistor count recorded.

Cache hierarchies are similar in structure but differ in total capacity. Both have 64 KB of L1 per core and 256 KB of L2 per core. The L3 cache, however, is 8 MB shared on the Xeon versus 9 MB shared on the i5. This gives the i5 a modest cache advantage despite its lower performance, which may help in certain memory-latency-sensitive workloads not captured by the Cinebench suite.

Memory support is a significant differentiator. The Xeon supports both DDR3 and DDR4 in a dual-channel configuration, with a memory bandwidth of 34.1 GB/s. The i5 supports only DDR4, also dual-channel, but with a higher bandwidth of 42.7 GB/s. The Xeon also supports ECC memory, which is a critical feature for server and workstation reliability, while the i5 does not. This aligns with their market segments: the Xeon targets error-correcting workloads, the i5 targets consumer desktop use.

Integrated graphics also separate them. The Xeon has no integrated graphics listed, while the i5 includes UHD Graphics 630. This means the i5 can drive a display without a discrete GPU, which is typical for desktop parts, whereas the Xeon relies on a separate graphics card. Both use the same PCIe configuration: Gen 3 with 16 lanes from the CPU.

The launch MSRP for the Xeon is $294, and for the i5 it is $182. Both processors are end-of-life, and neither has an unlocked multiplier. Their part numbers are SR2LH for the Xeon and SR3X6 for the i5.

The Verdict

The data is unambiguous: the Intel Xeon E3-1260L v5 outperforms the Intel Core i5-8400T in every recorded benchmark. Across six Cinebench tests spanning R15, R20, and R23, the Xeon leads by a margin that never dips below 11.2% and never exceeds 11.7%. This consistency makes the conclusion straightforward: for pure CPU rendering performance, the Xeon is the stronger choice.

However, the verdict is not solely about speed. The i5-8400T has advantages that matter in specific contexts. It has integrated graphics, which the Xeon lacks, making it a more self-contained desktop solution. It also supports faster memory bandwidth (42.7 GB/s versus 34.1 GB/s), though only with DDR4, while the Xeon offers the flexibility of DDR3 or DDR4. The i5's larger L3 cache (9 MB versus 8 MB) could benefit certain workloads, and its lower TDP of 35 watts versus 45 watts means it draws less power under load.

The Xeon's key advantages beyond raw performance include ECC memory support, which is essential for data integrity in server or workstation environments, and its classification as a Server/Workstation part. Its 8 threads versus the i5's 6 threads also give it better multi-threaded scaling in applications that can use more than six threads, which the Cinebench results confirm.

For a user building a desktop system where integrated graphics are needed and power efficiency is paramount, the i5-8400T has a clear role. For anyone who can pair the Xeon with a discrete GPU and values ECC memory or maximum rendering throughput, the Xeon is the better pick based on the recorded data. The i5's higher memory bandwidth and larger cache do not translate into a benchmark win, so those theoretical advantages should be weighed carefully against the measured 11%+ deficit.

Specification Differences

| Specification | Intel Xeon E3-1260L v5 | Intel Core i5-8400T |

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

| Cores | 4 | 6 |

| Threads | 8 | 6 |

| Base Clock | 2.90 GHz | 1700.00 |

| Boost Clock | 3.90 GHz | 3.30 GHz |

| TDP | 45 W | 35 W |

| Architecture | Skylake | Coffee Lake |

| Codename | Skylake-DT | Coffee Lake |

| Generation | Xeon E3 (Skylake-DT) | Core i5 (Coffee Lake) |

| Process Node | 14 nm | 14 nm |

| Transistors | 1,750 million | Not recorded |

| Die Size | 122 mm² | 154 mm² |

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

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

| L3 Cache | 8 MB (shared) | 9 MB (shared) |

| Memory Support | DDR3, DDR4 | DDR4 |

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

| Memory Bandwidth | 34.1 GB/s | 42.7 GB/s |

| ECC Memory | Yes | No |

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

| Integrated Graphics | None | UHD Graphics 630 |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2015-10-18 | 2018-04-01 |

| Launch MSRP | $294 | $182 |

| Part Number | SR2LH | SR3X6 |

The table highlights the core count inversion: the i5 has 6 cores versus the Xeon's 4, yet the Xeon wins all benchmarks due to its higher clocks and hyper-threading. The i5's base clock is listed as 1700.00, which is dramatically lower than the Xeon's 2.90 GHz, and even its 3.30 GHz boost does not catch up to the Xeon's 3.90 GHz boost.

FAQ

Q: Which processor wins in multi-core benchmarks?

A: The Intel Xeon E3-1260L v5 wins all three multi-core tests: 707 versus 633 in Cinebench R15, 2946 versus 2638 in R20, and 7015 versus 6282 in R23. The margin is 11.7% in each case.

Q: Does the i5-8400T have any benchmark victory?

A: No. The head-to-head data shows 6 wins for the Xeon and 0 wins for the i5-8400T. The i5 does have Geekbench scores in the database, but the Xeon has no Geekbench results, so no comparison is possible there.

Q: Why does the 4-core Xeon beat the 6-core i5?

A: The Xeon has 8 threads versus the i5's 6, a higher base clock (2.90 GHz versus 1700.00) and a higher boost clock (3.90 GHz versus 3.30 GHz). These factors more than compensate for the i5's two additional physical cores in the recorded Cinebench workloads.

Q: Can the i5-8400T run without a discrete GPU?

A: Yes, it has integrated UHD Graphics 630. The Xeon E3-1260L v5 has no integrated graphics, so it requires a separate graphics card for display output.

Q: Does the Xeon support ECC memory?

A: Yes, ECC memory is supported on the Xeon E3-1260L v5. The i5-8400T does not support ECC memory.

Q: Which processor has higher memory bandwidth?

A: The i5-8400T has a higher memory bandwidth at 42.7 GB/s, compared to the Xeon's 34.1 GB/s. However, the Xeon supports both DDR3 and DDR4, while the i5 supports only DDR4.

Where Each One Wins

The Intel Xeon E3-1260L v5 wins in every measured rendering benchmark, so any workload that resembles Cinebench's multi-threaded or single-threaded rendering will favor the Xeon. Its 8 threads and higher clock speeds make it the stronger choice for CPU-intensive tasks like video encoding, 3D rendering, and scientific computing, provided a discrete GPU is available. The Xeon's ECC memory support also makes it the appropriate pick for servers, workstations, or any environment where data corruption is unacceptable. The 45 W TDP is higher than the i5's 35 W, but the performance gain of 11.7% may justify the extra power draw in performance-critical systems.

The Intel Core i5-8400T wins in scenarios not covered by the head-to-head benchmarks. Its integrated UHD Graphics 630 means it can function as a complete desktop system without a dedicated GPU, which is ideal for basic office work, media playback, or lightweight productivity. Its lower 35 W TDP makes it more power-efficient, which suits compact builds or always-on systems. The higher memory bandwidth of 42.7 GB/s and larger 9 MB L3 cache could benefit memory-heavy workloads, though the benchmark data does not show a win in the tested areas. The i5 also has a lower launch MSRP of $182 versus the Xeon's $294, though pricing should not be the deciding factor given the performance gap.

Ultimately, the choice depends on the use case. For raw CPU throughput in rendering and multi-threaded applications, the Xeon is the clear winner. For a power-efficient desktop with integrated graphics and no need for ECC, the i5-8400T has a defined role. The recorded data does not show a single test where the i5 outperforms the Xeon, so any advantage the i5 holds is limited to features outside the benchmark suite.