Intel Xeon D-1518 vs Intel Xeon E5-2609 v3 Comparison

The Intel Xeon D-1518 and Intel Xeon E5-2609 v3 are both server-oriented processors from Intel, yet they represent different design philosophies within the same era of computing. The D-1518 is a compact, low-power Broadwell part built for dense, embedded, and edge deployments, while the E5-2609 v3 is a larger Haswell-EP chip designed for traditional rack servers with expansive memory and I/O capabilities. The recorded benchmark data shows that despite their architectural and physical differences, these two CPUs land remarkably close in raw compute performance, with the D-1518 holding a slim but consistent edge across every measured test. This analysis examines what the numbers reveal about their relative strengths, their architectural divergence, and which specific workloads each processor is better suited to handle.

The Verdict

The benchmark results are unusually close. Across six Cinebench tests, the Intel Xeon D-1518 wins all six, but the margins are narrow. In multi-core tests, the D-1518 leads by 1% in Cinebench R15 (390 vs 386), by 1.1% in R20 (1628 vs 1611), and by 1.1% in R23 (3877 vs 3836). Single-core results show the same pattern: a tie at 54 in R15, then a 0.9% lead in R20 (229 vs 227), and a 1.1% edge in R23 (547 vs 541). For buyers choosing between these two, the decision should not be made on raw compute performance, as the data shows near parity. The selection should hinge on platform-level differences.

The D-1518 is the clear choice for deployments where physical space, power draw, and thermal output are the primary constraints. Its 35 TDP rating versus the E5-2609 v3's 85 TDP is a decisive differentiator, as is its compact Intel BGA 1667 socket, which suits integrated and embedded systems. The E5-2609 v3, with its 6 cores, quad-channel memory, and 40 PCIe lanes, is better suited for systems that need memory bandwidth, expansion capacity, and the upgrade path of a standard Socket 2011-3 platform, despite its end-of-life status. The data suggests that performance parity means the choice is dictated by the surrounding system architecture, not by the processor itself.

Architecture Differences

The two processors come from different Intel microarchitectures. The D-1518 is built on Broadwell, a 14 nm process, while the E5-2609 v3 is based on Haswell, fabricated on a 22 nm node. This process advantage gives the D-1518 a smaller die size of 246 mm² compared to the E5-2609 v3's 356 mm², even though the D-1518 packs more transistors: 3,200 million versus 2,600 million. The smaller, denser manufacturing process explains how the D-1518 achieves a much lower TDP of 35 watts against the E5-2609 v3's 85 watts, all while maintaining competitive clock speeds and cache configurations.

Core and thread counts differ meaningfully. The D-1518 has 4 cores with Hyper-Threading, providing 8 threads, while the E5-2609 v3 has 6 physical cores but no Hyper-Threading, yielding only 6 threads. The base clock rates also differ: the D-1518 runs at 2.20 GHz, while the E5-2609 v3 has a base clock of 1900.00 MHz. Neither processor offers a boost clock. The cache layouts are notably divergent. The D-1518 has 1.5 MB of L3 cache per core, while the E5-2609 v3 has a 15 MB shared L3 cache. The D-1518's per-core L1 and L2 allocations are 64 KB and 256 KB per core, respectively, and the E5-2609 v3 matches those same per-core values. However, the shared L3 on the E5-2609 v3 totals 15 MB, which is larger in absolute terms but spread across six cores, whereas the D-1518's per-core L3 approach gives each of its four cores a dedicated 1.5 MB slice.

Memory architecture is another major split. The D-1518 supports both DDR3 and DDR4 memory over a dual-channel bus, while the E5-2609 v3 supports DDR4 only, but over a quad-channel bus with a recorded memory bandwidth of 51.2 GB/s. PCIe connectivity also differs: the D-1518 provides Gen 3 with 24 lanes (CPU only), while the E5-2609 v3 provides Gen 3 with 40 lanes (CPU only). Both support ECC memory, and both lack integrated graphics. The production statuses differ as well: the D-1518 is listed as Active, while the E5-2609 v3 is End-of-life. The D-1518 was released on 2015-03-08, while the E5-2609 v3 came slightly earlier on 2014-09-07.

Head-to-Head Benchmarks

The Cinebench test suite, covering R15, R20, and R23 in both multi-core and single-core modes, reveals a consistent pattern of near-ties with the D-1518 always on top. In Cinebench R15 multi-core, the D-1518 scores 390 against the E5-2609 v3's 386, a 1% advantage. The R15 single-core test is an exact tie at 54 points each, with the D-1518 credited as the winner by a 0% delta. Moving to R20, the multi-core test shows the D-1518 at 1628 versus 1611, a 1.1% lead, and the single-core test shows 229 versus 227, a 0.9% edge. In R23, the gap remains consistent: 3877 against 3836 in multi-core (1.1%) and 547 against 541 in single-core (1.1%).

These margins are small enough that they fall within run-to-run variance for many workloads, but the consistency across all three versions of the test is notable. The D-1518's 8 threads appear to edge out the E5-2609 v3's 6 threads in multi-core rendering, despite the E5-2609 v3 having two additional physical cores. The single-core results are nearly identical, which aligns with the fact that both chips have similar base clocks (2.20 GHz versus 1900.00 MHz, though the E5-2609 v3's lower clock is partially offset by the older Haswell architecture's per-core efficiency differences). The data shows that in synthetic rendering workloads, neither processor has a decisive functional advantage; the D-1518's wins are real but marginal.

Specification Differences

The recorded specifications reveal several key differences between the two processors. The D-1518 has 4 cores and 8 threads, while the E5-2609 v3 has 6 cores and 6 threads. The D-1518 has a base clock of 2.20 GHz; the E5-2609 v3 has a base clock of 1900.00 MHz. TDP differs substantially: 35 watts for the D-1518 versus 85 watts for the E5-2609 v3. The socket types are entirely different: Intel BGA 1667 for the D-1518, versus Intel Socket 2011-3 for the E5-2609 v3. The process node is 14 nm for the D-1518 and 22 nm for the E5-2609 v3. Transistor counts are 3,200 million versus 2,600 million, and die sizes are 246 mm² versus 356 mm². The cache structures differ, with the D-1518 using 1.5 MB L3 per core and the E5-2609 v3 using 15 MB shared L3. Memory support: the D-1518 handles DDR3 and DDR4 over dual-channel, the E5-2609 v3 handles DDR4 only over quad-channel with a 51.2 GB/s bandwidth rating. PCIe lanes are 24 for the D-1518 and 40 for the E5-2609 v3. The production status is Active for the D-1518 and End-of-life for the E5-2609 v3. Release dates are 2015-03-08 for the D-1518 and 2014-09-07 for the E5-2609 v3. The launch MSRP for the D-1518 is $193, and the launch MSRP for the E5-2609 v3 is $306. Neither processor has an unlocked multiplier. The D-1518 part number is SR2DN, and the E5-2609 v3 part number is SR1YC.

FAQ

Q: Which processor has more cores?

A: The Intel Xeon E5-2609 v3 has 6 physical cores, while the Intel Xeon D-1518 has 4 physical cores. However, the D-1518 supports Hyper-Threading, giving it 8 threads total, whereas the E5-2609 v3 has 6 threads total.

Q: How do they compare in multi-core performance?

A: The D-1518 wins all multi-core Cinebench tests by narrow margins: 1% in R15 (390 vs 386), 1.1% in R20 (1628 vs 1611), and 1.1% in R23 (3877 vs 3836).

Q: Is there a difference in single-core performance?

A: The single-core scores are nearly identical. In R15, both score 54. In R20, the D-1518 scores 229 versus 227 for the E5-2609 v3, a 0.9% difference. In R23, the D-1518 scores 547 versus 541, a 1.1% difference.

Q: Which processor supports more memory channels?

A: The E5-2609 v3 supports quad-channel DDR4 memory with a recorded bandwidth of 51.2 GB/s. The D-1518 supports dual-channel DDR3 and DDR4 memory, and no specific bandwidth figure is recorded for it.

Q: Which processor has more PCIe lanes?

A: The E5-2609 v3 provides Gen 3 with 40 lanes (CPU only), while the D-1518 provides Gen 3 with 24 lanes (CPU only).

Q: What is the power consumption difference?

A: The D-1518 has a TDP of 35 watts, while the E5-2609 v3 has a TDP of 85 watts. This is a significant difference in thermal design power, favoring the D-1518 for power-sensitive deployments.

Where Each One Wins

The D-1518 wins every recorded benchmark, so on pure compute metrics, it is the stronger processor. Its wins are consistent in both multi-core and single-core tests, with margins ranging from 0% to 1.1%. The D-1518 also wins decisively on power efficiency, with a TDP of 35 watts against 85 watts, and on manufacturing efficiency, with a 14 nm process versus 22 nm, a smaller die (246 mm² vs 356 mm²), and a higher transistor count (3,200 million vs 2,600 million). It also carries the advantage of an Active production status, whereas the E5-2609 v3 is End-of-life. The D-1518's support for both DDR3 and DDR4 memory gives it flexibility in legacy or mixed environments, and its compact BGA 1667 socket makes it suitable for embedded, networking, and edge compute appliances where space is at a premium.

The E5-2609 v3's advantages are entirely platform-level. It offers 6 physical cores, which can be beneficial for workloads that scale with core count rather than thread count, even though the benchmark data shows the D-1518's 8 threads still win in Cinebench. Its quad-channel memory bus with 51.2 GB/s bandwidth is a substantial upgrade over the D-1518's dual-channel design, making it the better choice for memory-bandwidth-sensitive applications such as large in-memory databases or high-throughput virtualized environments. The 40 PCIe lanes (CPU only) versus 24 lanes (CPU only) provide more room for expansion cards, NVMe storage, and high-speed networking. The Socket 2011-3 platform is a standard server socket, offering a broader ecosystem of motherboards, cooling solutions, and chassis compatibility compared to the soldered BGA 1667 package of the D-1518. The E5-2609 v3 also has a larger shared L3 cache of 15 MB, which may help in workloads where data sharing across cores is frequent.

In summary, the benchmark data shows these two processors are effectively tied in compute performance, with the D-1518 holding a slight edge across the board. The real decision is about system design: choose the D-1518 for low-power, compact, actively produced platforms, and choose the E5-2609 v3 for full-sized servers that need memory bandwidth, PCIe expansion, and six physical cores, provided the end-of-life status is acceptable.