Intel Core i5-8400H vs Intel Xeon E3-1280 v5 Comparison

Head-to-Head Benchmarks

The recorded data presents a remarkably consistent picture. Across every single Cinebench iteration in the head-to-head comparison, the Intel Xeon E3-1280 v5 finishes ahead of the Intel Core i5-8400H. The Xeon wins all six contested benchmarks, with the i5-8400H failing to secure a single victory. This uniformity in results is striking, especially given the architectural and market differences between the two chips.

In the multicore tests, the Xeon E3-1280 v5 scores 707 in Cinebench R15, compared to 644 for the Core i5-8400H, a delta of 9.8%. The pattern repeats in R20, where the Xeon posts 2946 against 2684, again a 9.8% advantage. In R23 multicore, the Xeon scores 7015 while the i5-8400H manages 6392, a 9.7% lead. The consistency of this roughly 10% margin across all three generations of the test suggests a steady, architectural performance edge rather than a workload-specific quirk.

The single-core results tell a similar story, with the Xeon leading by 10% in R15 (99 vs 90) and 9.8% in both R20 (415 vs 378) and R23 (990 vs 902). This is notable because the Core i5-8400H has a higher boost clock on paper. Yet the benchmark data shows the older, server-oriented Xeon consistently extracting more performance per cycle in this rendering workload. That is a 10% single-threaded advantage for the Xeon, a meaningful gap for any workload that scales poorly across cores.

The data also allows for a broader contextualization. In the database, the Xeon's average benchmark score is 2029, which places it in the 45th percentile among all CPUs. Its closest rivals are the Intel Xeon E3-1260L v5 at 2029 (a 0% delta) and the Intel Core i5-1130G7 at 2026 (a 0.1% delta). The Core i5-8400H, with an average score of 2003, sits just behind in the same 45th percentile, with its nearest rival being the Intel Core i5-8300H at 2005 (a 0.1% delta). The Xeon is closer to its rivals than the i5-8400H is to its own, but the head-to-head margin between the two in question is consistent and clear.

Architecture Differences

The foundational difference between these two processors is their architectural lineage and target market. The Intel Xeon E3-1280 v5 is built on the Skylake architecture, specifically the Skylake-DT codename, and is designed for the Server/Workstation segment. The Intel Core i5-8400H, in contrast, uses the Coffee Lake architecture, from the Coffee Lake-H family, and is a Mobile processor. This fundamental split in purpose dictates many of the downstream specifications.

Both are manufactured on Intel's 14 nm process node. The Xeon packs 1,750 million transistors into a 122 mm² die. The Core i5-8400H has its transistor count listed as null in the database, but its die size is slightly larger at 126 mm². The core and thread counts are identical: 4 cores and 8 threads. The cache hierarchy differs, however. Both have 64 KB of L1 and 256 KB of L2 per core. The shared L3 cache is where they diverge, with the Xeon featuring 8 MB (shared) and the Core i5-8400H featuring 12 MB (shared). The i5-8400H holds a 50% advantage in L3 capacity, which could be a factor in its overall performance context, though the benchmark data shows the Xeon still wins in Cinebench.

Memory and platform support also separate them. The Xeon supports ECC memory and uses the Intel Socket 1151. The Core i5-8400H does not support ECC and is soldered to a BGA 1440 socket, reflecting its mobile nature. The Xeon also specifies a PCIe implementation of Gen 3 with 16 lanes (CPU only), while the Core i5-8400H has null for this field. A significant feature difference is integrated graphics: the Core i5-8400H includes the UHD 630, while the Xeon has no integrated graphics listed. This means the Xeon requires a discrete GPU in any system, whereas the Coffee Lake chip has a fallback or basic display output solution. The Xeon is also the older part, with a release date of 2015-10-18, while the Core i5-8400H was released on 2018-04-01.

Where Each One Wins

The benchmark data shows a clean sweep for the Intel Xeon E3-1280 v5 across the entire set of Cinebench tests. There is no test in the head-to-head table where the Core i5-8400H wins. This means that for any workload that mimics the Cinebench rendering pattern, the Xeon has a consistent, roughly 10% advantage. This is true for both multi-core and single-core workloads.

Given this data, the Xeon is the better choice for any scenario that prioritizes raw calculation throughput in rendering or similar multi-threaded tasks. Its consistent lead in the multicore tests, 9.8% in R15 and R20, and 9.7% in R23, indicates that it sustains its performance efficiently. For a server or workstation environment, where ECC memory support is a requirement for data integrity, the Xeon is the only viable option of the two, as the Core i5-8400H lacks ECC support.

The Core i5-8400H's advantage lies in its platform characteristics, not its raw performance in the tested benchmarks. Its 45 watt TDP is significantly lower than the Xeon's 80 watts, making it far more suitable for a mobile chassis where cooling and power draw are at a premium. It also brings integrated UHD 630 graphics to the table, allowing for a complete system without a discrete GPU, which is a key trait for a laptop. Its BGA 1440 socket is a mobile package, and its larger 12 MB L3 cache, while not enough to overcome the Xeon in the Cinebench tests, might benefit other workloads. However, the recorded data only shows the Cinebench tests, so that must be the basis of any conclusion. In the recorded data, the Xeon wins everywhere.

Specification Differences

The specification table reveals the two chips are more different than their similar core counts might suggest. The most obvious differences are in the socket type and platform. The Xeon uses the desktop-oriented Intel Socket 1151, while the Core i5-8400H is on the mobile-only Intel BGA 1440. The Xeon is a server/workstation part, and the Core i5 is for mobile.

The clock speeds differ notably. The Xeon has a base clock of 3.70 GHz and a boost clock of 4.00 GHz. The Core i5-8400H has a lower base clock of 2.50 GHz but a higher boost clock of 4.10 GHz. This indicates the i5-8400H is designed to burst to high frequencies for short periods, while the Xeon is tuned for a sustained, higher baseline frequency. This is also reflected in the TDP, with the Xeon using 80 watts and the Core i5 using 45 watts.

Cache sizes are a key divergence. The Xeon offers 8 MB of shared L3, while the Core i5-8400H offers 12 MB of shared L3. The Xeon supports ECC memory, a critical feature for error correction in server environments, while the Core i5 does not. The Xeon also lists a PCIe Gen 3 implementation with 16 lanes (CPU only), while the Core i5 does not list a PCIe configuration. The integrated graphics field is null for the Xeon, while the Core i5 has the UHD 630. The process node is the same (14 nm), but the die size differs: 122 mm² for the Xeon and 126 mm² for the Core i5. The release dates are also different, with the Xeon from 2015 and the Core i5 from 2018.

FAQ

Q: Which CPU has the higher benchmark scores?

A: The Intel Xeon E3-1280 v5 has higher scores in every head-to-head benchmark result. It wins all six Cinebench tests, with deltas ranging from 9.7% to 10% over the Intel Core i5-8400H.

Q: Can I use the Intel Core i5-8400H in a server motherboard?

A: The data indicates the Core i5-8400H uses the Intel BGA 1440 socket, which is a mobile package. It does not support ECC. The database lists the Xeon as a Server/Workstation part, while the Core i5 is listed as Mobile. The sockets are not interchangeable.

Q: Which processor has a higher boost clock speed?

A: The Intel Core i5-8400H has a higher boost clock at 4.10 GHz, compared to the Intel Xeon E3-1280 v5's boost clock of 4.00 GHz. However, the Xeon has a much higher base clock of 3.70 GHz versus the i5's 2.50 GHz.

Q: Does the Intel Xeon E3-1280 v5 have integrated graphics?

A: No. The database lists integrated graphics as null for the Intel Xeon E3-1280 v5. The Intel Core i5-8400H, in contrast, includes UHD 630 integrated graphics.

Q: What is the average benchmark score for each CPU?

A: The Intel Xeon E3-1280 v5 has an average benchmark score of 2029, placing it in the 45th percentile. The Intel Core i5-8400H has an average of 2003, also in the 45th percentile.

Q: Do both CPUs have the same number of cores?

A: Yes. Both the Intel Xeon E3-1280 v5 and the Intel Core i5-8400H are listed with 4 cores and 8 threads.

The Verdict

The benchmark data is conclusive: the Intel Xeon E3-1280 v5 is the faster processor in the Cinebench suite. It wins every single test, with a consistent edge of roughly 9.7% to 10% over the Intel Core i5-8400H in both single-core and multi-core workloads. For anyone building a system where rendering performance is the primary metric, the Xeon is the clear choice based on the recorded measurements.

The Intel Core i5-8400H's strengths lie not in the raw Cinebench scores but in its platform and feature set. Its 45 watt TDP versus the 80 watt TDP of the Xeon makes it a better fit for thermally constrained environments, and its integrated UHD 630 graphics means it can operate without a discrete GPU. The data shows it has a larger L3 cache (12 MB vs 8 MB) and a higher boost clock (4.10 GHz vs 4.00 GHz).

However, the Xeon has a higher base clock and supports ECC. The Xeon is the winner in the performance column, while the i5-8400H is the winner in the mobile and low-power column. The decision comes down to the platform requirements. For a fixed workstation, the Xeon's performance lead is the deciding factor. For a mobile, power-sensitive build, the i5-8400H is the only one that fits the socket and power envelope, but the data shows it is slower in the measured tasks. Users in the market for a server or workstation CPU should favor the Xeon E3-1280 v5; those locked into a BGA 1440 mobile platform must use the i5-8400H and accept its lower benchmark scores.