Intel Core i7-5820K vs Intel Xeon D-1577 Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the Intel Xeon D-1577 across every benchmark in the comparison. The Xeon wins all six head-to-head tests, covering both single-core and multi-core workloads in Cinebench R15, R20, and R23. The deltas are consistent, with the Xeon leading by 11% to 11.3% depending on the specific test.

In Cinebench R15 multi-core, the Xeon D-1577 scores 946 against the Core i7-5820K's 841, a margin of 11.1%. The single-core result in the same test is similar: 133 versus 118, a delta of 11.3%. Moving to Cinebench R20, the Xeon posts 3943 in multi-core against 3508 for the i7, again an 11% advantage. The single-core R20 numbers are 556 versus 495, also 11% apart. Cinebench R23 shows the same pattern: 9389 against 8354 in multi-core and 1325 versus 1179 in single-core, both with an 11% delta.

The consistency of these margins is notable. The Xeon does not merely win on raw thread count; it also wins single-core tests, where clock speed typically matters more. The i7-5820K has a higher base clock at 3.30 GHz and a boost at 3.60 GHz, while the Xeon D-1577 has a base clock of 1300.00 MHz and a boost of 2.10 GHz. Despite the i7's higher clock figures, the Xeon's newer architecture and more cores still produce better results in every measured test. The benchmark averages reinforce this: the Xeon has an average score of 2715, while the i7-5820K sits at 2642, and the percentile rankings place the Xeon at 50 versus the i7's 49.

The nearest rivals in the database provide context for both chips. The i7-5820K's closest competitor is the Intel Xeon E-2274G with an average score of 2643, a delta of 0%. The Intel Core i9-8950HK and Intel Core i7-1195G7 both sit just behind at 2641 and 2638 respectively, with deltas of 0.1%. The Intel Core i7-7740X scores 2648, a delta of -0.2%, meaning it slightly outperforms the i7-5820K. For the Xeon D-1577, its nearest rival is the Intel Core i7-11390H at 2715 with a delta of 0%, followed by the AMD Ryzen 5 PRO 5650U at 2713 with 0.1% and the Intel Xeon E-2226G at 2709 with 0.2%. The AMD Ryzen 7 4700U scores 2722, which is 0.2% higher than the Xeon. These figures show both chips sit in a competitive mid-range band, with the Xeon holding a slight overall edge.

The Verdict

The data points to one straightforward conclusion: the Intel Xeon D-1577 is the better performer in every benchmark recorded. If the priority is raw processing power, the Xeon wins without exception. That said, the choice between these two depends heavily on the intended use case, and the database clarifies the trade-offs.

The Xeon D-1577 is the pick for workloads that benefit from its 16 cores and 32 threads. Server and workstation tasks, virtualization, and heavily threaded applications will see the advantage. Its 45 W TDP is far lower than the i7's 140 W, which matters in dense deployments. The Xeon also supports ECC memory, a critical feature for reliability in server environments. It is an active product with a launch MSRP of 1379, and it is designed for the Intel BGA 1667 socket, meaning it is soldered and not upgradeable.

The Core i7-5820K, by contrast, is a desktop part from the Haswell-E generation. It has 6 cores and 12 threads, a 140 W TDP, and an unlocked multiplier. That unlocked multiplier is significant: the i7 can be overclocked, which the data does not measure but which is a documented feature. The i7 also has quad-channel memory support, giving it a memory bandwidth of 68.3 GB/s, while the Xeon relies on dual-channel memory and has no recorded bandwidth figure. For a desktop builder who wants overclocking headroom and high memory throughput, the i7 has structural advantages that benchmarks alone do not capture.

However, the benchmark results are unambiguous. The Xeon wins all six tests, and the margins are consistent. For any user who cannot overclock or who prioritizes out-of-box performance, the Xeon is the correct choice. The i7 is end-of-life, while the Xeon remains active, which also favors the Xeon for new builds.

Architecture Differences

The two processors come from different Intel generations and are built on different process nodes. The Core i7-5820K is based on Haswell-E, using a 22 nm process, while the Xeon D-1577 uses Broadwell on a 14 nm node. The newer process gives the Xeon a transistor count of 3,200 million on a die size of 246 mm². The i7 has 2,600 million transistors on a larger die of 356 mm². The smaller die with more transistors reflects the density improvement of the newer node.

Core and thread counts differ sharply. The i7 has 6 cores and 12 threads; the Xeon has 16 cores and 32 threads. Cache layouts also diverge. Both use 64 KB of L1 and 256 KB of L2 per core, but L3 is organized differently. The i7 has a shared 15 MB L3 cache, while the Xeon allocates 1.5 MB of L3 per core. That per-core allocation can reduce contention in heavily threaded workloads, while the shared pool on the i7 may benefit fewer threads.

Memory support and channels differ. The i7 supports DDR4 over a quad-channel bus, with a recorded bandwidth of 68.3 GB/s. The Xeon supports both DDR3 and DDR4, but only over a dual-channel bus, and no bandwidth figure is recorded. ECC memory is supported on the Xeon but not on the i7. PCIe lanes also differ: the i7 provides 28 Gen 3 lanes, while the Xeon provides 24 Gen 3 lanes.

The sockets are incompatible. The i7 uses Intel Socket 2011-3, a desktop platform that allows CPU swapping. The Xeon uses Intel BGA 1667, a ball-grid array that is soldered to the board. The i7 has an unlocked multiplier; the Xeon does not. The i7 is a desktop part, while the Xeon targets the server and workstation segment. Release dates are roughly 18 months apart: the i7 launched in August 2014, the Xeon in February 2016.

FAQ

Q: Which processor has more cores?

A: The Intel Xeon D-1577 has 16 cores and 32 threads, while the Intel Core i7-5820K has 6 cores and 12 threads.

Q: Does the Xeon D-1577 support ECC memory?

A: Yes, the Xeon D-1577 supports ECC memory. The Core i7-5820K does not support ECC.

Q: Which chip wins in single-core performance?

A: The Xeon D-1577 wins all single-core tests. In Cinebench R23 single-core, it scores 1325 against 1179 for the i7-5820K, a difference of 11%.

Q: Can the Core i7-5820K be overclocked?

A: Yes, the i7-5820K has an unlocked multiplier. The Xeon D-1577 does not have an unlocked multiplier.

Q: What is the memory channel configuration for each?

A: The i7-5820K uses quad-channel memory with a bandwidth of 68.3 GB/s. The Xeon D-1577 uses dual-channel memory, and no bandwidth figure is recorded.

Q: Which processor is still in production?

A: The Xeon D-1577 is listed as active in production. The Core i7-5820K is end-of-life.

Where Each One Wins

The Xeon D-1577 wins every measured benchmark, so in performance terms, it is the clear choice for compute-heavy tasks. Its 16 cores and 32 threads give it a structural advantage in multi-threaded workloads like video rendering, scientific simulation, and server-side processing. The Cinebench multi-core scores reflect this: 946 in R15, 3943 in R20, and 9389 in R23, all ahead of the i7. The Xeon also wins single-core tests, which is surprising given its lower boost clock, but the data is clear. For any workload that can use many threads, the Xeon is the better part.

The i7-5820K, despite losing all benchmarks, has specific structural advantages. Its unlocked multiplier allows overclocking, which can close or exceed the recorded gaps in real-world use. Its quad-channel memory bus provides 68.3 GB/s of bandwidth, which is valuable for memory-sensitive applications. The i7 also uses Socket 2011-3, meaning it can be replaced or upgraded without changing the motherboard, unlike the soldered Xeon. For a desktop enthusiast who plans to overclock and values memory throughput, the i7 is the more flexible platform.

The Xeon's lower TDP of 45 W against the i7's 140 W makes it far more efficient for dense or power-constrained environments. Active production status and ECC support further favor the Xeon for server deployments. The i7 is end-of-life, so sourcing new units may be an issue. In summary, the Xeon wins on measured performance and efficiency; the i7 wins on overclocking flexibility and memory bandwidth. Choose the Xeon for out-of-box performance and reliability, choose the i7 for a modifiable desktop build.

Specification Differences

| Specification | Intel Core i7-5820K | Intel Xeon D-1577 |

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

| Cores | 6 | 16 |

| Threads | 12 | 32 |

| Base clock | 3.30 GHz | 1300.00 MHz |

| Boost clock | 3.60 GHz | 2.10 GHz |

| TDP | 140 W | 45 W |

| Socket | Intel Socket 2011-3 | Intel BGA 1667 |

| Architecture | Haswell | Broadwell |

| Process node | 22 nm | 14 nm |

| Transistors | 2,600 million | 3,200 million |

| Die size | 356 mm² | 246 mm² |

| L3 cache | 15 MB (shared) | 1.5 MB (per core) |

| Memory support | DDR4 | DDR3, DDR4 |

| Memory bus | Quad-channel | Dual-channel |

| Memory bandwidth | 68.3 GB/s | Not recorded |

| ECC memory | No | Yes |

| PCIe lanes | Gen 3, 28 lanes | Gen 3, 24 lanes |

| Market segment | Desktop | Server/Workstation |

| Production status | End-of-life | Active |

| Multiplier unlocked | Yes | No |

| Launch date | August 2014 | February 2016 |