Intel Core i7-8565U vs Intel Xeon D-2799 Comparison

The Intel Core i7-8565U and the Intel Xeon D-2799 are both Intel processors, but they occupy opposite ends of the computing spectrum. The i7-8565U is a Whiskey Lake-U mobile part, designed for thin-and-light laptops with a focus on efficiency. The Xeon D-2799 is an Ice Lake-D server/workstation processor, built for dense, always-on environments where compute throughput and memory bandwidth are paramount. The database records show a stark performance divide, but the story is more nuanced than raw scores alone, as each chip is tailored to a distinct workload and physical environment.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Xeon D-2799 has 20 cores and 40 threads. The Intel Core i7-8565U has 4 cores and 8 threads.

Q: What is the difference in memory bandwidth between the two?

A: The Xeon D-2799 supports quad-channel DDR4 memory with a recorded bandwidth of 102.4 GB/s. The Core i7-8565U uses dual-channel DDR3 or DDR4 memory with a bandwidth of 38.4 GB/s.

Q: Does the Core i7-8565U include integrated graphics?

A: Yes, it features Intel UHD Graphics 620. The Xeon D-2799 has no integrated graphics.

Q: Which processor supports ECC memory?

A: The Xeon D-2799 supports ECC memory. The Core i7-8565U does not.

Q: How do their Cinebench R23 multi-core scores compare?

A: The Xeon D-2799 scores 28,723, which is 81.7% higher than the Core i7-8565U’s score of 5,258.

Q: What is the production status of each chip?

A: The Core i7-8565U is marked as end-of-life, while the Xeon D-2799 is currently active in production.

Architecture Differences

The architectural gap between these two processors is fundamental. The Core i7-8565U is built on Intel’s 14 nm process node, while the Xeon D-2799 uses the newer 10 nm node. This process advantage, combined with a different core design, explains much of the performance delta. The i7-8565U is based on the Whiskey Lake architecture, specifically the Whiskey Lake-U variant, and belongs to the Core i7 generation. In contrast, the Xeon D-2799 is part of the Ice Lake family, specifically Ice Lake-D, and belongs to the Xeon D generation.

The core count difference is massive: 4 cores and 8 threads for the mobile chip versus 20 cores and 40 threads for the server chip. Cache hierarchies also diverge sharply. The i7-8565U has 64 KB of L1 cache per core, 256 KB of L2 cache per core, and 8 MB of shared L3 cache. The Xeon D-2799 has 80 KB of L1 per core, 1.25 MB of L2 per core, and 30 MB of shared L3 cache. This larger cache pool is critical for server workloads that repeatedly access large datasets.

Memory architecture further separates the two. The i7-8565U supports DDR3 and DDR4 memory over a dual-channel bus, yielding 38.4 GB/s of bandwidth. The Xeon D-2799 supports DDR4 over a quad-channel bus, delivering 102.4 GB/s. That is a 2.7x raw bandwidth advantage for the Xeon, which matters for multi-threaded database queries, virtualization, and heavy I/O. The Xeon also supports ECC memory, a feature absent on the mobile chip, which is essential for data integrity in server environments.

PCIe connectivity differs as well. The i7-8565U provides PCIe Gen 3 with 16 lanes (CPU only). The Xeon D-2799 provides PCIe Gen 4 with 32 lanes (CPU only). The newer generation and double lane count give the Xeon far more headroom for high-speed NVMe storage, network cards, and accelerators. The sockets are incompatible: Intel BGA 1528 for the mobile chip versus Intel BGA 2579 for the server chip. The Xeon D-2799 also targets a different market segment (Server/Workstation) and has a launch MSRP of $1972, while the i7-8565U, launched earlier, carries a launch MSRP of $409.

The Verdict

The data points to a clear conclusion: the Intel Xeon D-2799 is the superior processor for raw compute performance, winning all six head-to-head benchmark comparisons. Its multi-core Cinebench R23 score of 28,723 is 81.7% higher than the i7-8565U’s 5,258. In single-core R23, the Xeon scores 4,055 versus 742, again an 81.7% lead. The Xeon also dominates in Cinebench R15 and R20, both multi-core and single-core, with consistent 81.7% to 81.9% deltas. For anyone running multi-threaded server applications, data processing, or virtualization, the Xeon D-2799 is the obvious choice.

However, the Core i7-8565U is not without purpose. Its 15 W TDP is dramatically lower than the Xeon’s 129 W TDP, making it suitable for battery-powered laptops. The integrated UHD Graphics 620 eliminates the need for a discrete GPU in basic systems. The database records its percentile ranking at 65 versus 64 for the Xeon, meaning the mobile chip sits slightly higher relative to all CPUs tracked, despite its far lower absolute scores. This is because the i7-8565U’s average benchmark score of 8,665 is actually close to the Xeon’s 8,308, once all recorded tests (including PassMark suites) are averaged. The PassMark results for the i7-8565U, such as 21,581 in integer math and 12,934 in floating point math, are respectable for a 4-core part. The Xeon’s benchmark list only includes Cinebench tests, which skews its average lower.

Who should pick which? A mobile professional needing long battery life, light productivity, and no discrete GPU should choose the Core i7-8565U. A system builder deploying a rack server, a network appliance, or a workstation that handles heavy parallel workloads should choose the Xeon D-2799. The Xeon’s ECC memory support and quad-channel bandwidth are non-negotiable for reliability-focused environments. The i7-8565U, being end-of-life, is suited for legacy or low-power designs, while the Xeon D-2799 remains an active, forward-looking product.

Specification Differences

| Specification | Intel Core i7-8565U | Intel Xeon D-2799 |

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

| Cores | 4 | 20 |

| Threads | 8 | 40 |

| Base Clock | 1800.00 MHz | 2400.00 MHz |

| Boost Clock | 4.60 GHz | 3.40 GHz |

| TDP | 15 W | 129 W |

| Socket | Intel BGA 1528 | Intel BGA 2579 |

| Architecture | Whiskey Lake | Ice Lake |

| Codename | Whiskey Lake-U | Ice Lake-D |

| Generation | Core i7 (Whiskey Lake) | Xeon D (Ice Lake-D) |

| Process Node | 14 nm | 10 nm |

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

| L2 Cache | 256 KB (per core) | 1.25 MB (per core) |

| L3 Cache | 8 MB (shared) | 30 MB (shared) |

| Memory Support | DDR3, DDR4 | DDR4 |

| Memory Bus | Dual-channel | Quad-channel |

| Memory Bandwidth | 38.4 GB/s | 102.4 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 4, 32 Lanes (CPU only) |

| Integrated Graphics | UHD Graphics 620 | None |

| Market Segment | Mobile | Server/Workstation |

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

| Release Date | 2018-09-30 | 2022-02-23 |

| Launch MSRP | $409 | $1972 |

| Part Number | SREJPSRFFW | SRLCTSRM2C |

Head-to-Head Benchmarks

The recorded head-to-head data is unambiguous: the Xeon D-2799 wins every single test. Starting with Cinebench R15 multi-core, the Xeon scores 2,895 against the i7-8565U’s 529, a delta of -81.7% from the mobile chip’s perspective. In R15 single-core, the Xeon hits 408 versus 74, an 81.9% margin. These are not close contests; they are order-of-magnitude differences that reflect the 5x core count and higher base clock.

Moving to Cinebench R20, the pattern repeats. The Xeon D-2799 records 12,063 in multi-core, while the i7-8565U manages 2,208, an 81.7% deficit. Single-core R20 shows 1,703 for the Xeon and 311 for the i7-8565U, again an 81.7% gap. The consistency of these deltas across different Cinebench versions suggests the performance ratio is stable across workloads, likely driven by the core count and memory bandwidth advantages.

The most telling results are in Cinebench R23, the latest version in the database. Multi-core: Xeon 28,723, i7-8565U 5,258, an 81.7% lead for the Xeon. Single-core: Xeon 4,055, i7-8565U 742, an 81.7% lead. The single-core results are particularly interesting because they show that the Xeon’s lower boost clock (3.40 GHz versus 4.60 GHz) does not hurt it in this metric. The Ice Lake architecture’s higher IPC, due to the 10 nm node and newer design, more than compensates for the lower frequency.

Beyond Cinebench, the i7-8565U has additional PassMark results in the database, though these are not part of the head-to-head table. Its PassMark multi-thread score is 5,988, single-thread is 2,118, data compression is 75,995, and encryption is 1,993. These numbers, while not compared directly to the Xeon, show the i7-8565U is a capable processor for its class, especially in data compression where it scores 75,995. The Xeon D-2799’s nearest rivals in the database include the Intel Xeon Platinum 8268 and Xeon Gold 5320T, both with average scores around 8,315, which is close to the Xeon D-2799’s own 8,308. The i7-8565U’s nearest rivals include the Core i9-13900E and Core i5-8365U, with average scores around 8,676 and 8,708, respectively.

In summary, the benchmark data tells a simple story: the Xeon D-2799 is a compute powerhouse that leaves the Core i7-8565U far behind in every recorded test. The i7-8565U, however, competes in a different arena, one where low power and integrated graphics matter more than raw throughput. The database records both chips as having near-identical percentile rankings (65 and 64), which contextualizes the performance gap: relative to all CPUs, the mobile chip holds its own, while the server chip is similarly positioned. For buyers, the choice is not about which is faster, but which fits the intended physical and workload environment.