CPU Comparison

The Intel Core i9-9900KF and Intel Xeon E-2356G occupy different corners of the Intel lineup, yet their benchmark averages place them in the same performance tier. The i9-9900KF is an end-of-life desktop part built on Coffee Lake, while the Xeon E-2356G is an active server/workstation chip on Rocket Lake. Despite sharing a 5.00 GHz boost clock and 14 nm process node, the data reveals distinct strengths: the Xeon wins the majority of Cinebench tests by slim margins, while the Core i9 dominates Geekbench multi-core by a wide margin. This analysis breaks down the architecture, specifications, and head-to-head results to determine which processor suits which workload.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Intel Core i9-9900KF has a higher average benchmark score of 4652, compared to the Intel Xeon E-2356G’s 4548. The delta is small, and both share the same 58th percentile ranking among all CPUs.

Q: How does the Core i9-9900KF compare to its nearest rivals?

A: The i9-9900KF’s average score of 4652 is 0.8% ahead of the Intel Core i9-10900 (4614), 0.3% behind the Intel Core i9-10900F (4664), and 0.7% behind the Intel Core i9-11900T (4685). It also trails the Intel Core i9-10900E (4708) by 1.2%.

Q: What is the biggest single benchmark margin between the two chips?

A: The largest margin is in Geekbench multi-core, where the Intel Core i9-9900KF scores 8970 versus the Xeon E-2356G’s 7213, a 24.4% advantage. The smallest margin is a 2.2% delta in most Cinebench tests, favoring the Xeon.

Q: Does the Xeon E-2356G support ECC memory?

A: Yes, the Intel Xeon E-2356G supports ECC memory with a memory bandwidth of 51.2 GB/s. The Core i9-9900KF does not support ECC and has a lower memory bandwidth of 42.7 GB/s.

Q: What are the launch MSRP values for the two processors?

A: The Intel Core i9-9900KF has a launch MSRP of $488, while the Intel Xeon E-2356G has a launch MSRP of $311.

Q: Which processor has more PCIe lanes?

A: The Intel Xeon E-2356G provides Gen 4 with 20 lanes (CPU only), whereas the Intel Core i9-9900KF provides Gen 3 with 16 lanes (CPU only).

Architecture Differences

The two processors represent different architectural generations from Intel, both built on the same 14 nm process node. The Core i9-9900KF is based on Coffee Lake, specifically the Coffee Lake-R refresh, and fits the Intel Socket 1151. Its die size is 180.3 mm². The Xeon E-2356G is built on Rocket Lake, specifically the Rocket Lake-E variant, and uses Intel Socket 1200, with a significantly larger die size of 276 mm².

Core and thread counts differ meaningfully. The i9-9900KF has 8 cores and 16 threads, while the Xeon E-2356G has 6 cores and 12 threads. Cache hierarchies also diverge: the i9-9900KF has 64 KB L1 per core, 256 KB L2 per core, and 16 MB shared L3; the Xeon E-2356G has larger per-core caches at 80 KB L1 and 512 KB L2, but a smaller 12 MB shared L3.

Both chips support DDR4 memory in dual-channel configuration, but the Xeon E-2356G delivers higher memory bandwidth at 51.2 GB/s versus 42.7 GB/s for the i9-9900KF. The Xeon also adds ECC memory support and includes integrated UHD Graphics P750, whereas the i9-9900KF has no integrated graphics. PCIe capabilities differ as well: the Xeon offers Gen 4 with 20 lanes, the i9-9900KF is limited to Gen 3 with 16 lanes.

The market positioning is clear from the architecture. The i9-9900KF is a desktop part with an unlocked multiplier, end-of-life production status, and a 2019 release date. The Xeon E-2356G is a server/workstation chip with a locked multiplier, active production status, and a 2021 release date. TDP also favors the Xeon: 80 W versus 95 W for the i9-9900KF.

The Verdict

Based strictly on benchmark data, the Intel Xeon E-2356G is the better choice for single-threaded and most multi-threaded Cinebench workloads. It wins 7 of 8 head-to-head tests, including all six Cinebench iterations and Geekbench single-core. The Xeon’s advantage in Cinebench is consistent at 2.2% to 2.3%, which is modest but uniform across R15, R20, and R23. Its single-core lead in Geekbench is larger at 16.5%, reflecting the newer Rocket Lake architecture’s higher IPC.

The Intel Core i9-9900KF, however, is the clear winner in Geekbench multi-core, scoring 8970 versus 7213, a 24.4% margin. This suggests the 8-core/16-thread configuration provides a substantial advantage in workloads that scale heavily with core count, even against the Xeon’s architectural improvements. The i9-9900KF also carries a higher average benchmark score overall (4652 vs 4548) and is ranked in the same 58th percentile.

For buyers in the server/workstation segment, the Xeon E-2356G offers ECC memory support, Gen 4 PCIe, integrated graphics, and lower power consumption at 80 W. The i9-9900KF, despite being end-of-life, remains relevant for desktop users who prioritize raw multi-core performance in Geekbench-style tests and have no need for ECC or server-grade features. The data does not support one universal winner; the choice depends on whether the workload favors the Xeon’s consistency across Cinebench and single-core tasks or the i9-9900KF’s dominant Geekbench multi-core score.

Specification Differences

| Specification | Intel Core i9-9900KF | Intel Xeon E-2356G |

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

| Cores | 8 | 6 |

| Threads | 16 | 12 |

| Base Clock | 3.60 GHz | 3.20 GHz |

| Boost Clock | 5.00 GHz | 5.00 GHz |

| TDP | 95 W | 80 W |

| Socket | Intel Socket 1151 | Intel Socket 1200 |

| Architecture | Coffee Lake | Rocket Lake |

| Codename | Coffee Lake-R | Rocket Lake-E |

| Generation | Core i9 (Coffee Lake Refresh) | Xeon E (Rocket Lake-E) |

| Process Node | 14 nm | 14 nm |

| Die Size | 180.3 mm² | 276 mm² |

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

| L2 Cache | 256 KB (per core) | 512 KB (per core) |

| L3 Cache | 16 MB (shared) | 12 MB (shared) |

| Memory Bandwidth | 42.7 GB/s | 51.2 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 4, 20 Lanes (CPU only) |

| Integrated Graphics | None | UHD Graphics P750 |

| Market Segment | Desktop | Server/Workstation |

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

| Release Date | 2019-01-07 | 2021-09-07 |

| Launch MSRP | $488 | $311 |

| Multiplier Unlocked | Yes | No |

| Part Number | SRG1ASRFAA | SRKN2 |

Head-to-Head Benchmarks

The head-to-head results show a clear pattern: the Intel Xeon E-2356G wins on every Cinebench test, but the Intel Core i9-9900KF takes one decisive victory in Geekbench multi-core. Starting with Cinebench R15 multi-core, the Xeon scores 1575 against the i9-9900KF’s 1541, a 2.2% margin. Single-core R15 follows the same trend, with the Xeon at 222 versus 217, a 2.3% edge.

Cinebench R20 repeats the pattern almost exactly. Multi-core sees the Xeon at 6565 versus 6422, again a 2.2% difference. Single-core has the Xeon at 926 versus 906, also 2.2% ahead. Cinebench R23 continues this uniformity: multi-core scores are 15632 for the Xeon and 15292 for the i9-9900KF, a 2.2% gap, while single-core shows 2206 versus 2158, another 2.2% difference.

The Geekbench results break the monotony. In multi-core, the i9-9900KF scores 8970, which is 24.4% higher than the Xeon’s 7213. This is the single largest delta in the comparison and the only test the i9-9900KF wins. In Geekbench single-core, the Xeon reverses course with a 2044 score versus 1706, a 16.5% advantage.

Across all eight benchmarks, the Xeon E-2356G claims 7 wins, while the i9-9900KF takes 1. The Cinebench deltas are consistently small (2.2-2.3%), suggesting the Xeon’s architectural improvements are modest in these tests. The Geekbench multi-core result, however, is a massive outlier, indicating that the i9-9900KF’s two additional cores provide a substantial boost in that specific workload. The 24.4% margin is enough to give the i9-9900KF a higher average benchmark score overall, despite losing the majority of individual tests.