Intel Core i5-11400T vs Intel Xeon D-1587 Comparison

The Intel Xeon D-1587 and Intel Core i5-11400T occupy very different corners of the Intel lineup, yet their average benchmark scores are separated by just 1.2% in favor of the Xeon. This proximity in overall performance, however, masks a stark divide in how they achieve those results. The Xeon D-1587 leverages 16 cores and 32 threads to dominate multi-threaded workloads, while the Core i5-11400T counters with a much higher boost clock of 3.70 GHz against the Xeon's 2.30 GHz. The data reveals a classic conflict between a server-oriented chip designed for sustained throughput and a desktop processor built for responsiveness. The head-to-head results show the Xeon winning all six Cinebench tests, but the margins are consistently narrow, ranging from 4.2% to 4.5%. This suggests that while the Xeon has a definitive edge in rendering and computation, the Core i5 is not far behind despite having 10 fewer cores and 20 fewer threads.

Where Each One Wins

The Xeon D-1587 is the clear winner in every scenario that scales with core count. Its 16 cores and 32 threads give it a structural advantage in multi-threaded Cinebench tests, where it wins by 4.2% in R15, R20, and R23 multi-core runs. This makes it the better choice for workloads like video rendering, 3D scene compilation, and any parallel processing task that can utilize more than a dozen threads. The Xeon’s 65W TDP also allows it to sustain higher power draw than the Core i5’s 35W TDP, which likely contributes to its ability to keep all 16 cores engaged without thermal throttling in a server chassis.

The Core i5-11400T, despite losing all six direct comparisons, still holds its own in single-threaded scenarios. Its 3.70 GHz boost clock is significantly higher than the Xeon’s 2.30 GHz, which explains why the single-core Cinebench scores are so close. The Xeon wins by only 4.5% in R15 single-core and 4.2% in R23 single-core. For everyday desktop use, light gaming, or applications that rely on a few fast cores, the Core i5’s architectural efficiency per clock is likely to feel more responsive. It also includes integrated UHD Graphics 730, meaning the system can operate without a discrete GPU, which is impossible with the Xeon that has no integrated graphics. The Core i5’s desktop market segment and Socket 1200 compatibility make it a direct replacement for older desktop systems, while the Xeon’s BGA 1667 socket is soldered and meant for embedded or server boards.

Architecture Differences

The two processors come from different architectural eras, even though both are built on Intel’s 14 nm process node. The Xeon D-1587 uses the Broadwell architecture, specifically the Broadwell-DE generation, which is a server-oriented design focused on power efficiency and high core density. Its die size is 246 mm² and it packs 3,200 million transistors. The Core i5-11400T uses the Rocket Lake architecture, which is a desktop design that prioritizes higher clock speeds and per-core performance. Its die is larger at 276 mm², but the transistor count is not listed in the data, suggesting a different design philosophy focused on IPC improvements over raw core counts.

Cache configurations highlight the divergent approaches. The Xeon D-1587 has 64 KB of L1 and 256 KB of L2 per core, with 1.5 MB of L3 per core, which for 16 cores amounts to 24 MB of total L3 cache. The Core i5-11400T has 80 KB of L1 and 512 KB of L2 per core, but its L3 is 12 MB shared across all six cores. The shared cache on the Core i5 is more efficient for six cores accessing common data, while the Xeon’s per-core L3 allocation is designed to prevent cache contention across 16 cores. Memory support also differs: the Xeon supports both DDR3 and DDR4 with ECC memory, while the Core i5 only supports DDR4 without ECC. The Core i5’s memory bandwidth is rated at 51.2 GB/s, whereas the Xeon’s bandwidth is not listed. The Xeon offers PCIe Gen 3 with 24 lanes, while the Core i5 offers PCIe Gen 4 with 20 lanes, giving the desktop chip faster I/O per lane despite fewer total lanes.

Head-to-Head Benchmarks

The most striking pattern in the head-to-head results is the consistency of the Xeon’s victory margins. Across all six Cinebench tests, the deltaPct hovers between 4.2% and 4.5%. In Cinebench R15 multi-core, the Xeon scores 1167 against the Core i5’s 1120, a 4.2% win. In R15 single-core, the Xeon wins 164 to 157, a 4.5% margin that is the largest of any test. This is surprising because the Core i5 has a much higher boost clock, implying that the Xeon’s per-core IPC in single-threaded tasks is notably better than the Core i5’s, or that the Core i5’s 1.30 GHz base clock is holding back its single-core performance in short bursts.

In Cinebench R20, the Xeon scores 4865 multi-core versus 4667, and 686 single-core versus 658, both 4.2% and 4.3% wins respectively. The R23 results mirror this: 11585 versus 11113 in multi-core, and 1635 versus 1569 in single-core, both 4.2% margins. The fact that the multi-core and single-core margins are nearly identical suggests that the Xeon’s advantage is not just about core count but also about architectural efficiency. The Core i5’s higher boost clock does not translate into a single-core win, which implies that the Broadwell architecture’s execution engine is more efficient per clock in Cinebench’s workload than Rocket Lake’s. This is a counterintuitive result given that Rocket Lake is a newer architecture, but the data is unambiguous.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon D-1587 has 16 cores and 32 threads, while the Intel Core i5-11400T has 6 cores and 12 threads. The Xeon has 10 more cores and 20 more threads than the Core i5.

Q: Does the Core i5-11400T ever win any benchmark in the head-to-head comparison?

A: No. The head-to-head data shows the Xeon D-1587 winning all six Cinebench tests (R15, R20, and R23 in both multi-core and single-core). The Core i5 has zero wins in the direct comparison.

Q: What is the difference in single-core performance between the two?

A: The Xeon D-1587 wins single-core tests by 4.5% in Cinebench R15 (164 vs 157) and 4.2% in R23 (1635 vs 1569). Despite the Core i5’s higher 3.70 GHz boost clock versus the Xeon’s 2.30 GHz, the Xeon still leads.

Q: Can the Core i5-11400T run without a dedicated graphics card?

A: Yes. The Core i5-11400T includes integrated UHD Graphics 730. The Xeon D-1587 has no integrated graphics, so it requires a separate GPU for display output.

Q: Which processor supports ECC memory?

A: The Xeon D-1587 supports ECC memory and accepts both DDR3 and DDR4. The Core i5-11400T only supports DDR4 and does not support ECC memory.

Q: How do the two compare in overall average benchmark score?

A: The Xeon D-1587 has an average benchmark score of 3350, while the Core i5-11400T has an average of 3309. The Xeon is 1.2% ahead, which places both processors at the 54th percentile of all CPUs.

Specification Differences

The two processors differ in nearly every core specification. The Xeon D-1587 has 16 cores and 32 threads, while the Core i5-11400T has 6 cores and 12 threads. The Xeon’s base clock is 1700.00 MHz, higher than the Core i5’s 1300.00 MHz, but the Core i5’s boost clock is 3.70 GHz, significantly higher than the Xeon’s 2.30 GHz. The TDP differs substantially: the Xeon is rated at 65W, while the Core i5 is rated at 35W. The Xeon uses the Intel BGA 1667 socket, while the Core i5 uses Intel Socket 1200. The Xeon is built on the Broadwell architecture with a 246 mm² die size and 3,200 million transistors, while the Core i5 uses Rocket Lake with a 276 mm² die size and no listed transistor count. Cache layouts are distinct: the Xeon has 64 KB L1 and 256 KB L2 per core, with 1.5 MB L3 per core, while the Core i5 has 80 KB L1 and 512 KB L2 per core, with 12 MB shared L3. The Xeon supports DDR3 and DDR4 with ECC, while the Core i5 only supports DDR4 without ECC. The Xeon’s memory bandwidth is not listed, but the Core i5’s is 51.2 GB/s. PCIe support differs: the Xeon has Gen 3 with 24 lanes, while the Core i5 has Gen 4 with 20 lanes. The Core i5 includes integrated graphics (UHD Graphics 730), while the Xeon has none. The Xeon is a server/workstation segment chip released on 2016-02-23, while the Core i5 is a desktop chip released on 2021-03-15. The Xeon’s launch MSRP is 1549, while the Core i5’s launch MSRP is $182. The Core i5 is marked as end-of-life, while the Xeon is active in production.

The Verdict

The data points to a straightforward conclusion for multi-threaded workloads: the Xeon D-1587 is the better processor. Its 16 cores and 32 threads deliver a consistent 4.2% advantage in Cinebench multi-core tests, and its support for ECC memory and both DDR3 and DDR4 makes it suitable for server environments where data integrity and memory flexibility are critical. The Xeon’s 65W TDP is higher but reasonable for a server board, and its active production status means it remains available for new deployments. The Core i5-11400T, however, is not far behind in raw compute, with its 51.2 GB/s memory bandwidth and PCIe Gen 4 support offering faster I/O for desktop tasks. Its integrated graphics and lower 35W TDP make it ideal for compact desktops or office machines that do not need a discrete GPU.

For users with an existing Socket 1200 motherboard or those building a low-power desktop, the Core i5-11400T is the practical choice, especially given its end-of-life status implies it may be available at lower prices in the used market. The Xeon D-1587, with its BGA 1667 socket, requires a specific server board, which limits its appeal to workstation builders. The head-to-head data shows the Xeon winning every test, but the margins are narrow enough that the Core i5’s higher boost clock and newer PCIe standard could make it feel faster in real-world desktop applications that are not fully multi-threaded. Ultimately, the Xeon is for those who need maximum core count and ECC reliability, while the Core i5 is for those who want a capable, efficient desktop chip with integrated graphics and modern I/O.