Intel Core i5-9400 vs Intel Xeon D-1715TER Comparison

The Intel Core i5-9400 and Intel Xeon D-1715TER are both Intel parts, but they target entirely different corners of the market. The data shows a clear sweep: the Xeon D-1715TER wins all six head-to-head benchmark comparisons, despite having fewer physical cores. This is a case where architectural maturity and platform features outweigh raw core counts. The i5-9400 is a desktop part from the Coffee Lake era, while the Xeon D-1715TER is a newer Ice Lake-D server processor. For anyone deciding between them, the Xeon is the stronger performer in every tested workload, but the i5-9400 holds its own as a capable desktop chip. The verdict is not about which is "better" in a vacuum, but which fits the intended use case.

The Verdict

The benchmark results are unambiguous: the Intel Xeon D-1715TER wins every single head-to-head test, with a consistent performance margin of roughly 14% across the board. In Cinebench R23 multi-core, the Xeon scores 7738 against the i5-9400’s 6629, a delta of -14.3%. The single-core results tell the same story, with the Xeon leading 1092 to 935 in R23 single-core (-14.4%). This is not a close contest by any metric.

For desktop users, the i5-9400 is the more familiar choice, but the data does not favor it. Its six cores and six threads are outpaced by the Xeon’s four cores and eight threads, thanks to the latter’s newer architecture and higher memory bandwidth. The i5-9400 does have integrated graphics (UHD 630), which the Xeon lacks, but that is a feature for basic display output, not a performance advantage. The Xeon D-1715TER is the pick for server or workstation workloads where ECC memory and triple-channel bandwidth matter. It is also an active product, while the i5-9400 is end-of-life.

The average benchmark scores show the two are nearly identical in overall standing: the i5-9400 averages 2254, and the Xeon averages 2238. Both sit at the 47th percentile of all CPUs. Yet the head-to-head deltas are consistently negative for the i5-9400, meaning the Xeon’s architectural edge is real in every test. If you need raw compute, the Xeon D-1715TER is the clear winner. If you need a simple desktop processor with onboard graphics, the i5-9400 remains functional but is not competitive here.

Architecture Differences

The two processors come from different generations and manufacturing processes. The i5-9400 uses Intel’s 14 nm process and Coffee Lake architecture, a design that debuted in late 2018. The Xeon D-1715TER is built on the 10 nm process with the Ice Lake-D architecture, released in early 2022. This process shrink is a major factor in the Xeon’s performance advantage, allowing higher efficiency despite a lower TDP.

Core and cache layouts differ substantially. The i5-9400 has six cores with 64 KB of L1 cache per core and 256 KB of L2 per core, plus 9 MB of shared L3 cache. The Xeon D-1715TER has four cores but with larger per-core caches: 80 KB of L1 and 1.25 MB of L2 per core, along with 10 MB of shared L3. This means the Xeon dedicates more silicon to cache per core, which helps in single-threaded and latency-sensitive tasks. The Xeon also supports 8 threads via hyperthreading, while the i5-9400 is limited to 6 threads with no hyperthreading.

Memory architecture is a key differentiator. The i5-9400 uses dual-channel DDR4 with a peak bandwidth of 42.7 GB/s and no ECC support. The Xeon D-1715TER uses triple-channel DDR4 with 64.0 GB/s of bandwidth and full ECC memory support. This is a critical feature for server reliability. The Xeon also supports PCIe Gen 4 with 16 lanes, whereas the i5-9400 is limited to PCIe Gen 3 with 16 lanes. The Xeon has no integrated graphics, while the i5-9400 includes UHD 630. The sockets are incompatible: LGA 1151 for the i5 versus BGA 2227 for the Xeon, meaning they are not drop-in replacements for each other.

Head-to-Head Benchmarks

The performance gap is consistent and significant across all six tests. Starting with Cinebench R15 multi-core, the Xeon D-1715TER scores 779 against the i5-9400’s 668, a 14.2% advantage. In R15 single-core, the Xeon leads 109 to 94, a 13.8% margin. The pattern holds in R20: multi-core is 3249 for the Xeon versus 2784 for the i5, a 14.3% difference, and single-core is 458 versus 392, a 14.4% difference. The most recent Cinebench R23 results show the Xeon at 7738 multi-core and 1092 single-core, compared to the i5-9400’s 6629 and 935, respectively, with deltas of -14.3% and -14.4%.

These numbers are surprising given the i5-9400’s higher base clock of 2.90 GHz and boost clock of 4.10 GHz, versus the Xeon’s 2.40 GHz base and 3.50 GHz boost. The Xeon’s advantage comes from its newer architecture, larger caches, and triple-channel memory. The i5-9400 does have a Geekbench result (5141 multi-core, 1389 single-core), but the Xeon has no Geekbench scores in the data, so no direct comparison is possible there. The head-to-head tests are all Cinebench, and the Xeon wins every one by a near-identical margin, indicating a consistent architectural superiority rather than a workload-specific anomaly.

The i5-9400’s best showing is in R15 multi-core, where it trails by only 14.2%, the smallest delta of the six tests. But even there, it loses. The Xeon’s win count of 6-0 is decisive. For any user running multi-threaded rendering or single-threaded tasks, the Xeon is the better performer. The i5-9400’s higher clocks do not compensate for its older design and lower memory bandwidth.

Specification Differences

The two CPUs differ in nearly every major specification. The i5-9400 has 6 cores and 6 threads, while the Xeon D-1715TER has 4 cores and 8 threads. Base clocks are 2.90 GHz for the i5 and 2.40 GHz for the Xeon; boost clocks are 4.10 GHz and 3.50 GHz, respectively. The i5-9400 has a TDP of 65 watts, while the Xeon is more efficient at 50 watts. The process node is 14 nm for the i5 and 10 nm for the Xeon.

Cache configurations are notably different. The i5-9400 has 64 KB L1 and 256 KB L2 per core, with 9 MB shared L3. The Xeon has 80 KB L1 and 1.25 MB L2 per core, with 10 MB shared L3. Memory support is dual-channel DDR4 with 42.7 GB/s bandwidth for the i5, versus triple-channel DDR4 with 64.0 GB/s for the Xeon. ECC memory is supported only on the Xeon. PCIe versions differ: Gen 3 on the i5, Gen 4 on the Xeon, both with 16 lanes. The i5-9400 includes UHD 630 integrated graphics; the Xeon has none.

The sockets are completely different: Intel Socket 1151 for the i5-9400 and Intel BGA 2227 for the Xeon D-1715TER. The i5-9400 is a desktop part with an unlocked multiplier? No, it is locked. The Xeon is also locked. The i5-9400 was released on 2018-10-18 and is end-of-life; the Xeon was released on 2022-02-23 and is active. The part numbers are SR3X5 for the i5 and SRLBX for the Xeon. The i5-9400 is in the Core i5 (Coffee Lake Refresh) generation, while the Xeon is in the Xeon D (Ice Lake-D) generation.

FAQ

Q: Which CPU is faster in multi-core performance?

A: The Intel Xeon D-1715TER wins all multi-core tests. In Cinebench R23, it scores 7738 versus the i5-9400’s 6629, a 14.3% advantage. The Xeon also leads in R20 multi-core (3249 vs 2784) and R15 multi-core (779 vs 668).

Q: Does the i5-9400 have any advantages over the Xeon D-1715TER?

A: The i5-9400 has integrated graphics (UHD 630), which the Xeon lacks. It also has a higher base clock (2.90 GHz vs 2.40 GHz) and boost clock (4.10 GHz vs 3.50 GHz). However, these clocks do not translate into better benchmark scores.

Q: Why does the Xeon D-1715TER beat the i5-9400 despite having fewer cores?

A: The Xeon uses a newer 10 nm process and Ice Lake-D architecture, compared to the i5-9400’s 14 nm Coffee Lake. The Xeon also has larger per-core caches (80 KB L1 and 1.25 MB L2 per core) and triple-channel memory with 64.0 GB/s bandwidth, versus dual-channel at 42.7 GB/s for the i5.

Q: Can I use ECC memory with the i5-9400?

A: No. The i5-9400 does not support ECC memory. The Xeon D-1715TER does support ECC, making it suitable for server or workstation reliability requirements.

Q: Are these two CPUs compatible with the same motherboard?

A: No. The i5-9400 uses Intel Socket 1151, while the Xeon D-1715TER uses Intel BGA 2227. They are physically incompatible and require different platforms.

Q: What is the performance percentile for each CPU?

A: Both are at the 47th percentile of all CPUs. Their average benchmark scores are nearly identical: 2254 for the i5-9400 and 2238 for the Xeon D-1715TER.