Intel Core i9-9900KS vs Intel Xeon W-1290 Comparison

Where Each One Wins

The benchmark split is completely one-sided in the recorded data. The Intel Xeon W-1290 wins all six head-to-head Cinebench comparisons, covering both single-core and multi-core workloads across R15, R20, and R23. The Intel Core i9-9900KS does not win a single recorded benchmark in this matchup. That does not mean the i9-9900KS is without merit, but in this specific comparison, every measurable Cinebench result favors the Xeon.

The Xeon W-1290's wins are consistent in magnitude. Its multi-core advantage holds at 3.6% across all three Cinebench versions, while single-core leads range from 3.6% to 3.7%. This uniformity across different rendering workloads suggests a steady performance edge rather than a workload-specific quirk. The i9-9900KS does have additional benchmark data in the database (3DMark and Geekbench results), but those tests were not recorded for the Xeon W-1290, so no direct comparison is possible there.

For use-case splitting, the data points to the Xeon W-1290 as the stronger choice for any Cinebench-style rendering task, whether single-threaded or heavily threaded. The i9-9900KS's remaining strengths lie outside the directly comparable benchmark set, particularly in the 3DMark suite where it records scores such as 7376 in the 16-thread test and 841 in the single-thread test. Those figures stand on their own but cannot be weighed against the Xeon's performance without matching data.

Architecture Differences

The two processors come from different Intel architectures despite sharing a 14 nm process node and Intel as the foundry. The Core i9-9900KS uses Coffee Lake (codename Coffee Lake-R), while the Xeon W-1290 uses Comet Lake. The die sizes differ accordingly: the i9-9900KS measures 180 mm², the Xeon W-1290 is larger at 206 mm².

Core and thread counts differ significantly. The i9-9900KS has 8 cores and 16 threads, while the Xeon W-1290 offers 10 cores and 20 threads. This 25% core advantage for the Xeon aligns with its multi-core benchmark lead. Cache configurations follow the core counts: both have 64 KB L1 and 256 KB L2 per core, but the shared L3 cache is 16 MB on the i9-9900KS versus 20 MB on the Xeon W-1290.

Clock speeds tell a more nuanced story. The i9-9900KS has a 4.00 GHz base clock and a 5.00 GHz boost clock. The Xeon W-1290 starts lower at 3.20 GHz base but boosts higher to 5.20 GHz. The higher boost clock on the Xeon explains its single-core wins, while the combination of more cores and a higher boost clock drives its multi-core advantage. The i9-9900KS carries a 127 W TDP, notably higher than the Xeon W-1290's 80 W TDP, which is an unusual inversion given the Xeon's greater core count.

Memory support differs in one key aspect. Both use DDR4 with dual-channel buses, but the Xeon W-1290 supports ECC memory while the i9-9900KS does not. Memory bandwidth favors the Xeon slightly: 46.9 GB/s versus 42.7 GB/s. Both use PCIe Gen 3 with 16 CPU lanes. The i9-9900KS has an unlocked multiplier, while the Xeon W-1290 is locked. Integrated graphics also differ: UHD 630 on the i9-9900KS versus Intel UHD Graphics P630 on the Xeon. Sockets are incompatible (Socket 1151 versus Socket 1200), and the release dates are about seven months apart, with the i9-9900KS launching in October 2019 and the Xeon in May 2020.

Head-to-Head Benchmarks

The Cinebench R15 multi-core test opens the comparison with the Xeon W-1290 scoring 1718 against the i9-9900KS's 1657, a 3.6% lead. The single-core R15 result follows the same pattern: 242 versus 233, a 3.7% margin. These are the smallest absolute gaps in the dataset, but the relative differences match the larger workloads.

Cinebench R20 shows identical relative margins. The multi-core test has the Xeon at 7162 and the i9-9900KS at 6907, again a 3.6% difference. Single-core R20 scores are 1010 and 974 respectively, holding the 3.6% gap. The absolute point differences grow with the workload scale, but the percentage stays remarkably stable.

Cinebench R23 repeats the pattern with the largest absolute numbers. Multi-core results are 17054 for the Xeon and 16446 for the i9-9900KS, a 3.6% margin. Single-core results are 2407 and 2321, also 3.6% apart. Across all six comparisons, the Xeon W-1290 wins by margins between 3.6% and 3.7%, never exceeding 4% and never dropping below 3.5%. This consistency indicates the performance gap is structural, tied to the core count and boost clock differences, rather than workload-dependent.

The i9-9900KS's standalone benchmark scores provide context for its overall position. Its Geekbench multi-core score is 9771 and single-core is 1715. In 3DMark, it scores 7376 at 16 threads, 5787 at 8 threads, 3276 at 4 threads, 1670 at 2 threads, and 841 at single thread. These figures place its average benchmark score at 4738, while the Xeon W-1290 averages 4932. The Xeon's average is higher, consistent with its head-to-head sweep.

FAQ

Q: Which processor is faster in multi-core Cinebench workloads?

A: The Intel Xeon W-1290 wins all three multi-core Cinebench tests in the database. Its R15 score is 1718 versus 1657, R20 is 7162 versus 6907, and R23 is 17054 versus 16446. Each represents a 3.6% advantage.

Q: Does the Core i9-9900KS win any head-to-head benchmark?

A: No. The recorded head-to-head data shows zero wins for the i9-9900KS and six wins for the Xeon W-1290 across all Cinebench R15, R20, and R23 tests, both single-core and multi-core.

Q: How do the single-core results compare?

A: The Xeon W-1290 leads by 3.7% in Cinebench R15 single-core (242 versus 233) and by 3.6% in both R20 (1010 versus 974) and R23 (2407 versus 2321).

Q: What explains the Xeon's performance advantage?

A: The Xeon W-1290 has 10 cores and 20 threads versus 8 cores and 16 threads on the i9-9900KS, plus a higher boost clock of 5.20 GHz versus 5.00 GHz. It also has 20 MB of shared L3 cache versus 16 MB.

Q: Do the processors support the same memory features?

A: Both use DDR4 with dual-channel buses, but the Xeon W-1290 supports ECC memory while the i9-9900KS does not. Memory bandwidth is 46.9 GB/s on the Xeon versus 42.7 GB/s on the i9-9900KS.

Q: How do their average benchmark scores compare?

A: The Xeon W-1290 has an average benchmark score of 4932, while the i9-9900KS averages 4738. Both rank at the 59th percentile among all CPUs in the database.

The Verdict

The recorded data makes a clear case for the Intel Xeon W-1290 in any directly comparable workload. It wins every Cinebench test, both single-core and multi-core, by margins that stay consistent between 3.6% and 3.7%. The Xeon's advantage comes from a combination of two more cores, two more threads, a higher boost clock, and a larger L3 cache. Its efficiency profile is also stronger on paper, with an 80 W TDP versus the i9-9900KS's 127 W, although the database does not include power consumption measurements to verify real-world impact.

The Core i9-9900KS is not without its own strengths. Its base clock is higher at 4.00 GHz versus 3.20 GHz, and it has an unlocked multiplier for overclocking, which the Xeon lacks. Its standalone 3DMark scores show solid multi-threaded performance, including 7376 in the 16-thread test. However, against the Xeon W-1290, those advantages do not translate into a single benchmark win in the head-to-head data.

For users choosing between these two, the Xeon W-1290 is the stronger option for Cinebench-class rendering workloads and for any application that can use 10 cores and 20 threads. The i9-9900KS may appeal to users who prioritize overclocking flexibility or who need a desktop-oriented platform with a smaller die footprint, but the benchmark data does not show it outperforming the Xeon in any recorded test. The Xeon's ECC memory support and active production status further reinforce its position as the more versatile and current choice in this comparison.

Specification Differences

| Specification | Intel Core i9-9900KS | Intel Xeon W-1290 |

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

| Cores | 8 | 10 |

| Threads | 16 | 20 |

| Base clock | 4.00 GHz | 3.20 GHz |

| Boost clock | 5.00 GHz | 5.20 GHz |

| TDP | 127 W | 80 W |

| Socket | Intel Socket 1151 | Intel Socket 1200 |

| Architecture | Coffee Lake | Comet Lake |

| Codename | Coffee Lake-R | Comet Lake |

| Die size | 180 mm² | 206 mm² |

| L3 cache | 16 MB (shared) | 20 MB (shared) |

| Memory bandwidth | 42.7 GB/s | 46.9 GB/s |

| ECC memory | No | Yes |

| Integrated graphics | UHD 630 | Intel UHD Graphics P630 |

| Market segment | Desktop | Server/Workstation |

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

| Release date | 2019-10-27 | 2020-05-12 |

| Multiplier unlocked | Yes | No |

| Part number | SRG1Q | SRH94 |

Both processors share the 14 nm process node, Intel as the foundry, DDR4 memory support, dual-channel memory bus, PCIe Gen 3 with 16 CPU lanes, and identical per-core L1 and L2 cache sizes (64 KB and 256 KB, respectively). The launch MSRP for the i9-9900KS is $513, and for the Xeon W-1290 it is $498.