Intel Core i9-13900KS vs Intel Xeon 6515P Comparison

Head-to-Head Benchmarks

The head-to-head data paints a lopsided picture at first glance, with the Intel Core i9-13900KS winning 14 of the 17 recorded comparisons. The most dramatic gap appears in single-thread performance, where the Core i9-13900KS posts a 4712 score in Passmark single-thread versus 2855 for the Xeon 6515P, a 39.4% advantage. That same pattern repeats across every Cinebench generation tested: the Core i9-13900KS leads by exactly 25% in R15, R20, and R23, both single-core and multi-core. The R23 multi-core result shows 51368 for the Core i9 against 38547 for the Xeon, a consistent and wide margin.

The Xeon 6515P does not go entirely unanswered. Its three wins are concentrated in specific workloads. The largest is in prime number finding, where the Xeon scores 385 versus 257, a 49.8% lead. Extended instruction throughput also favors the Xeon at 53383 versus 48217, a 10.7% edge. The physics test goes to the Xeon as well, 3829 to 3441, an 11.3% margin. These are not negligible results, but they are narrow compared to the Core i9's sweeping victories.

The Core i9's wins are also broad in scope. Data compression shows an 814838 score versus 592645, a 27.3% difference. Integer math favors the Core i9 by 30.3%, floating point by 16.7%, and random string sorting by 28.6%. Data encryption shows the largest single delta at 36.2%, with the Core i9 scoring 47772 against 30476. The multithread aggregate benchmark, often a proxy for overall throughput, gives the Core i9 a 25.2% lead at 60644 versus 45350.

What stands out is the consistency of the 25% delta across all Cinebench runs. This suggests a structural advantage rather than workload-specific luck. The Core i9's boost clock of 6.00 GHz versus 3.80 GHz for the Xeon likely explains the single-thread dominance. For multi-threaded tests, the Core i9's 24 cores versus 16 cores, despite the Xeon's larger shared cache, appear to tip the balance.

Architecture Differences

The two processors come from different Intel design families, and the underlying silicon reflects distinct priorities. The Xeon 6515P uses Granite Rapids architecture on a 5 nm process node, while the Core i9-13900KS uses Raptor Lake on a 10 nm node. The Xeon's smaller process node suggests denser transistors, yet the Core i9 maintains a clock advantage that the data shows is decisive.

Core counts differ meaningfully: the Xeon offers 16 cores and 32 threads, while the Core i9 offers 24 cores and 32 threads. The thread counts match, which means the Core i9 relies on a mix of performance and efficiency cores, a hybrid design typical of Raptor Lake. The Xeon's 16 cores are all performance-oriented, but the Core i9's additional 8 cores provide extra parallel capacity in multi-threaded benchmarks.

Cache layouts diverge sharply. The Xeon carries 72 MB of shared L3 cache, double the Core i9's 36 MB. Per-core L1 cache also favors the Xeon at 112 KB per core versus 80 KB per core. The L2 cache is identical at 2 MB per core. Despite the Xeon's larger cache pool, the Core i9 still wins most multi-threaded tests, indicating that raw cache size does not compensate for clock speed and core count in these workloads.

Memory architecture differs substantially. The Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, while the Core i9 uses dual-channel DDR5 (and also supports DDR4) with 89.6 GB/s. The Xeon's memory bandwidth is over 4.5 times higher, yet this does not translate into benchmark victories in the recorded tests. The Core i9's PCIe Gen 5 lane count is 20, while the Xeon provides 88 lanes, a server-class expansion capability that the desktop chip cannot match.

The Xeon lacks integrated graphics, while the Core i9 includes UHD Graphics 770. The Xeon's socket is Intel Socket 4710, a server platform, versus Intel Socket 1700 for the Core i9. The Xeon also has a later release date of 2025-02-23, while the Core i9 launched on 2023-01-11. Both carry a 150 TDP, and both support ECC memory. The Core i9 has an unlocked multiplier; the Xeon does not.

Where Each One Wins

The Core i9-13900KS dominates in scenarios that stress single-thread responsiveness and high-frequency execution. Its 6.00 GHz boost clock gives it a decisive edge in Cinebench single-core tests across all three versions, with a constant 25% lead. Passmark single-thread results reinforce this with a 39.4% gap. For desktop workloads like interactive coding, light compilation, or general productivity, the Core i9's frequency advantage is the deciding factor.

The Core i9 also wins in most throughput-heavy tasks, including data compression, encryption, integer math, floating point, and random string sorting. The 24-core configuration appears to provide a real multi-thread advantage in these Passmark sub-tests, despite the Xeon's larger cache and higher memory bandwidth. The multithread aggregate score of 60644 versus 45350 confirms that the Core i9 is the stronger general-purpose parallel processor in this comparison.

The Xeon 6515P carves out wins in specific computational patterns. Prime number finding, which often benefits from large caches and efficient integer division, shows a 49.8% lead. Extended instruction throughput, likely reflecting the Xeon's server-oriented instruction set extensions, gives it a 10.7% edge. The physics test, which may stress memory latency or specific floating-point patterns, also favors the Xeon by 11.3%. These results suggest the Xeon is better suited to scientific computing, simulation, or workloads that leverage its larger L3 cache and memory subsystem.

For server deployments, the Xeon's eight-channel memory and 88 PCIe lanes make it the obvious choice for memory-bandwidth-sensitive applications or heavy I/O configurations. The Core i9 cannot match this expansion capability. However, the benchmark data shows that for raw computational speed in the tested workloads, the Core i9 wins more often.

The Verdict

The recorded data points to the Intel Core i9-13900KS as the faster processor in the majority of tested benchmarks. It wins 14 of 17 head-to-head comparisons, with a consistent 25% margin in all Cinebench tests and a 39.4% lead in single-thread Passmark. The Core i9's higher boost clock, larger core count, and hybrid architecture provide a clear speed advantage across general-purpose and multi-threaded workloads.

The Intel Xeon 6515P is not a general-purpose speed champion in this matchup, but its three wins are meaningful. The 49.8% prime number lead and the 11.3% physics advantage suggest that certain algorithmic patterns favor its design. The Xeon's 72 MB L3 cache, eight-channel memory at 409.6 GB/s, and 88 PCIe Gen 5 lanes make it the appropriate choice for server platforms where memory bandwidth and expansion are critical, even if the benchmark scores do not reflect an overall performance win.

Users should choose the Core i9-13900KS for desktop workloads where frequency and multi-thread speed matter most. The data shows it outperforms the Xeon in compression, encryption, integer math, floating point, and every Cinebench test. Users should choose the Xeon 6515P for server or workstation deployments that require large memory channels, extensive PCIe connectivity, or specific workloads like prime number computation and extended instruction processing. The Xeon's launch MSRP is $740, while the Core i9's is $699.

FAQ

Q: Which processor has a higher single-core score in Cinebench R23?

A: The Intel Core i9-13900KS scores 7252 in Cinebench R23 single-core, versus 5442 for the Intel Xeon 6515P, a 25% advantage.

Q: Does the Xeon 6515P win any multi-threaded benchmark?

A: Yes, the Xeon wins the Passmark physics test with 3829 versus 3441, an 11.3% lead, and also wins prime number finding and extended instructions.

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

A: The Xeon 6515P supports eight-channel DDR5 with 409.6 GB/s bandwidth, while the Core i9-13900KS uses dual-channel DDR5 with 89.6 GB/s.

Q: How do the core counts compare?

A: The Xeon 6515P has 16 cores and 32 threads, while the Core i9-13900KS has 24 cores and 32 threads.

Q: Which processor supports integrated graphics?

A: The Core i9-13900KS includes UHD Graphics 770, while the Xeon 6515P has no integrated graphics.

Q: What is the largest single benchmark margin in either direction?

A: The Core i9-13900KS leads by 39.4% in Passmark single-thread (4712 versus 2855), while the Xeon 6515P leads by 49.8% in prime number finding (385 versus 257).

Specification Differences

| Specification | Intel Xeon 6515P | Intel Core i9-13900KS |

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

| Cores | 16 | 24 |

| Threads | 32 | 32 |

| Base Clock | 2.30 GHz | 3.20 GHz |

| Boost Clock | 3.80 GHz | 6.00 GHz |

| Socket | Intel Socket 4710 | Intel Socket 1700 |

| Architecture | Granite Rapids | Raptor Lake |

| Process Node | 5 nm | 10 nm |

| Die Size | Not specified | 257 mm² |

| L1 Cache | 112 KB (per core) | 80 KB (per core) |

| L3 Cache | 72 MB (shared) | 36 MB (shared) |

| Memory Support | DDR5 | DDR4, DDR5 |

| Memory Bus | Eight-channel | Dual-channel |

| Memory Bandwidth | 409.6 GB/s | 89.6 GB/s |

| PCIe Lanes | Gen 5, 88 Lanes | Gen 5, 20 Lanes |

| Integrated Graphics | N/A | UHD Graphics 770 |

| Market Segment | Server/Workstation | Desktop |

| Release Date | 2025-02-23 | 2023-01-11 |

| Launch MSRP | $740 | $699 |

| Multiplier Unlocked | No | Yes |

| Part Number | SRVU6 | SRMBX |