Intel Core i5-11400T vs Intel Xeon D-1581 Comparison

Where Each One Wins

The benchmark data tells a remarkably clear story: the Intel Xeon D-1581 wins every single one of the six recorded head-to-head comparisons. The Intel Core i5-11400T does not register a single win across any of the Cinebench R15, R20, or R23 tests, whether single-core or multi-core. This is a complete sweep, with the Xeon D-1581 taking all six victories.

However, the margins are so small that the practical difference is almost negligible. The largest delta between the two processors is just 1.3% in the Cinebench R15 single-core test, where the Xeon D-1581 scores 159 against the Core i5-11400T's 157. In every other test, the gap is under one percent. The Core i5-11400T trails by only 0.7% in Cinebench R15 multi-core, 0.7% in R20 multi-core, 0.8% in R20 single-core, 0.8% in R23 multi-core, and 0.7% in R23 single-core.

The use-case split, therefore, is not about one chip being dramatically faster. It is about context. The Core i5-11400T is a desktop processor with integrated UHD Graphics 730, a 35-watt TDP, and a 54th percentile ranking among all CPUs. The Xeon D-1581 is a server and workstation part with 16 cores, 32 threads, ECC memory support, and a 53rd percentile ranking. The Core i5-11400T wins on efficiency and desktop integration, while the Xeon D-1581 wins on raw thread count and memory reliability features.

For workloads that depend on sustained multi-threaded throughput, the Xeon D-1581's 16 cores and 32 threads provide the structural advantage, even if the benchmark scores are close. For desktop use cases where integrated graphics and lower power consumption matter, the Core i5-11400T is the more appropriate choice. The data shows a tie in practical performance, with the Xeon D-1581 holding a razor-thin edge in every measured category.

Architecture Differences

The two processors come from different Intel generations and target different market segments. The Core i5-11400T is built on the Rocket Lake architecture, uses the Intel Socket 1200, and is manufactured on a 14 nm process node with a die size of 276 mm². It is part of the Core i5 (Rocket Lake-S) generation and was released on 2021-03-15. The Xeon D-1581, in contrast, uses the Broadwell architecture, specifically the Broadwell-DE generation, and is built on the same 14 nm process but with a smaller die size of 246 mm². It uses the Intel BGA 1667 socket and was released much earlier, on 2016-02-23.

The core counts differ substantially. The Core i5-11400T has 6 cores and 12 threads, while the Xeon D-1581 has 16 cores and 32 threads. This is a 2.67x difference in core count and a 2.67x difference in thread count. The clock speeds tell the opposite story. The Core i5-11400T has a base clock of 1300 MHz and a boost clock of 3.70 GHz. The Xeon D-1581 has a higher base clock of 1800 MHz but a much lower boost clock of 2.40 GHz. The Core i5-11400T can boost nearly 1.3 GHz higher, which explains why its single-core performance is so close despite having far fewer cores.

Cache layouts also diverge. The Core i5-11400T has 80 KB of L1 cache per core, 512 KB of L2 cache per core, and a shared 12 MB L3 cache. The Xeon D-1581 has smaller per-core caches: 64 KB L1 and 256 KB L2, but a larger L3 allocation of 1.5 MB per core. With 16 cores, that amounts to 24 MB of total L3 cache, though the database records it on a per-core basis.

Memory support and PCIe capabilities are major differentiators. The Core i5-11400T supports DDR4 memory only, with dual-channel configuration and a memory bandwidth of 51.2 GB/s. It does not support ECC memory. The Xeon D-1581 supports both DDR3 and DDR4, also dual-channel, and has ECC memory support enabled. For PCIe, the Core i5-11400T offers Gen 4 with 20 lanes (CPU only), while the Xeon D-1581 offers Gen 3 with 24 lanes (CPU only). The Xeon's older PCIe standard is offset by more lanes.

The Core i5-11400T includes integrated UHD Graphics 730, while the Xeon D-1581 has no integrated graphics. The Core i5-11400T is a desktop part with a 35-watt TDP, and the Xeon D-1581 is a server/workstation part with a 65-watt TDP. The Core i5-11400T is marked as end-of-life, while the Xeon D-1581 remains in active production.

Head-to-Head Benchmarks

The recorded head-to-head data covers six Cinebench tests. In every case, the Xeon D-1581 wins, but the margins are consistently under 1.5%. The most significant gap appears in Cinebench R15 single-core, where the Xeon D-1581 scores 159 against the Core i5-11400T's 157, a delta of 1.3%. This is the largest relative difference in the entire comparison.

In Cinebench R15 multi-core, the Xeon D-1581 scores 1128, just 8 points ahead of the Core i5-11400T's 1120, a 0.7% delta. The pattern repeats in Cinebench R20: the Xeon D-1581 scores 4702 in multi-core versus 4667 for the Core i5-11400T, again a 0.7% delta. In single-core R20, the Xeon D-1581 scores 663 versus 658, a 0.8% delta.

Cinebench R23 shows the same consistent pattern. The Xeon D-1581 scores 11197 in multi-core, while the Core i5-11400T scores 11113, a 0.8% delta. In single-core R23, the Xeon D-1581 scores 1580 versus 1569, a 0.7% delta. These numbers indicate that the Xeon D-1581's advantage is uniform across all Cinebench versions, but it is remarkably small.

Interpreting these results requires context. The Xeon D-1581 has more than twice as many cores (16 versus 6), yet it only leads by 0.7% to 0.8% in multi-core tests. This suggests that the Core i5-11400T's higher boost clock of 3.70 GHz, combined with Rocket Lake's newer architecture, compensates for its lower core count. The single-core tests are even closer, with deltas of 0.7% to 1.3%, which aligns with the Core i5-11400T's superior boost clock.

For the average benchmark score, the Core i5-11400T actually ranks slightly higher. Its average benchmark score is 3309, while the Xeon D-1581's is 3238. The Core i5-11400T also has a marginally better percentile ranking at 54 versus 53. These aggregate metrics suggest that despite losing every head-to-head test, the Core i5-11400T is the stronger overall performer in the broader database, likely due to its Geekbench results, which are not part of the head-to-head set but are recorded in the benchmark data.

FAQ

Q: Which processor wins the most benchmarks in the head-to-head comparison?

A: The Intel Xeon D-1581 wins all six recorded head-to-head tests. It takes Cinebench R15, R20, and R23 in both single-core and multi-core variants, with deltas ranging from 0.7% to 1.3%.

Q: How much faster is the Xeon D-1581 in multi-core workloads?

A: The largest multi-core margin is 0.8% in Cinebench R23, where the Xeon D-1581 scores 11197 versus the Core i5-11400T's 11113. In R15 and R20, the multi-core deltas are both 0.7%.

Q: Does the Core i5-11400T have any performance advantage?

A: In the head-to-head tests, no. The Core i5-11400T does not win a single benchmark. However, its average benchmark score of 3309 is higher than the Xeon D-1581's 3238, and its percentile ranking of 54 exceeds the Xeon's 53.

Q: What is the core and thread difference?

A: The Core i5-11400T has 6 cores and 12 threads. The Xeon D-1581 has 16 cores and 32 threads, which is 10 more cores and 20 more threads.

Q: Which processor supports ECC memory?

A: Only the Intel Xeon D-1581 supports ECC memory. The Core i5-11400T does not have ECC support. The Xeon D-1581 also supports both DDR3 and DDR4, while the Core i5-11400T supports DDR4 only.

Q: Are there differences in integrated graphics?

A: Yes. The Core i5-11400T includes integrated UHD Graphics 730. The Xeon D-1581 has no integrated graphics, which is typical for a server/workstation processor.

Specification Differences

The table below lists only the fields where the two processors differ, based on the recorded data.

| Specification | Intel Core i5-11400T | Intel Xeon D-1581 |

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

| Cores | 6 | 16 |

| Threads | 12 | 32 |

| Base Clock | 1300 MHz | 1800 MHz |

| Boost Clock | 3.70 GHz | 2.40 GHz |

| TDP | 35 W | 65 W |

| Socket | Intel Socket 1200 | Intel BGA 1667 |

| Architecture | Rocket Lake | Broadwell |

| Codename | Rocket Lake | Broadwell |

| Generation | Core i5 (Rocket Lake-S) | Xeon D (Broadwell-DE) |

| Transistors | N/A | 3,200 million |

| Die Size | 276 mm² | 246 mm² |

| L1 Cache | 80 KB (per core) | 64 KB (per core) |

| L2 Cache | 512 KB (per core) | 256 KB (per core) |

| L3 Cache | 12 MB (shared) | 1.5 MB (per core) |

| Memory Support | DDR4 | DDR3, DDR4 |

| Memory Bandwidth | 51.2 GB/s | N/A |

| ECC Memory | No | Yes |

| PCIe | Gen 4, 20 Lanes (CPU only) | Gen 3, 24 Lanes (CPU only) |

| Integrated Graphics | UHD Graphics 730 | None |

| Market Segment | Desktop | Server/Workstation |

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

| Release Date | 2021-03-15 | 2016-02-23 |

| Launch MSRP | $182 | N/A |

| Part Number | SRKP2 | SR2LZ |

The launch MSRP for the Core i5-11400T is $182. The Xeon D-1581 has no recorded launch MSRP in the database. Both processors are locked, with no unlocked multiplier available for either. They share the same 14 nm process node, dual-channel memory bus, and Intel as the manufacturer. The Core i5-11400T has a higher boost clock and a smaller TDP, while the Xeon D-1581 offers more cores, ECC support, and a larger total cache allocation across its 16 cores.