Intel Core i9-10900F vs Intel Core i9-9900KS Comparison

The Intel Core i9-9900KS and Intel Core i9-10900F represent two distinct approaches to high-end desktop performance from Intel, separated by a generation but sharing the same 14 nm process foundation. The 9900KS is a special edition Coffee Lake part, engineered for a 5.00 GHz boost out of the box, while the 10900F is a more recent Comet Lake chip that trades raw per-core tuning for a higher core count. The benchmark data reveals a fascinating split: the older chip wins on low-thread-count workloads and in Geekbench, while the newer chip takes the crown in heavily threaded rendering tests. This page dissects exactly where each processor excels, what the architectural differences mean in practice, and which one the data suggests for different use cases.

Where Each One Wins

The performance profile of these two CPUs is not a simple matter of newer being better. The data shows a clean 7-7 split in benchmark wins between the two, indicating that the choice depends heavily on the nature of the workload. The Intel Core i9-9900KS dominates in scenarios that stress fewer cores. It wins the 3DMark tests for 2, 4, 8, and 16 threads, with advantages ranging from 1.4% to a substantial 7.1% in the 8-thread test. It also comes out ahead in the 3DMark single-thread test and both Geekbench tests, including a striking 15.7% lead in Geekbench multicore.

Conversely, the Intel Core i9-10900F asserts its superiority when all available cores are pushed to their limits. Its most significant win is in the 3DMark max threads test, where it scores 7866 against the 9900KS's 7360, a 6.4% lead. This trend continues across the entire Cinebench suite, where the 10900F consistently wins all R15, R20, and R23 multicore and single-core tests, albeit by a narrower margin of around 1.8% to 2.1%. The 10900F's advantage in Cinebench suggests that its two extra cores and 20 MB of L3 cache provide a tangible benefit in rendering applications that scale well with core count, even if its lower base clock of 2.80 GHz might seem a disadvantage on paper.

Architecture Differences

The core architectural story is one of refinement versus expansion. Both processors are built on Intel's 14 nm process, but they represent different design philosophies. The 9900KS is part of the Coffee Lake Refresh generation, featuring 8 cores and 16 threads. Its key differentiator is its 5.00 GHz boost clock, which is a significant factor in its strong low-thread-count performance. In contrast, the 10900F is from the Comet Lake generation, built for the Intel Socket 1200 platform, and it increases the core count to 10 cores and 20 threads. Its boost clock is slightly higher at 5.20 GHz, but its base clock is much lower at 2.80 GHz compared to the 9900KS's 4.00 GHz.

This core and clock configuration leads to different power characteristics. The 9900KS has a TDP of 127 W, while the 10900F is rated for just 65 W, despite having more cores. This is a notable difference, suggesting the 10900F is designed to be more power-efficient under typical loads, though the 9900KS's higher base clock likely allows it to sustain higher performance in lighter workloads. The cache hierarchy also differs: the 9900KS has 16 MB of shared L3 cache, while the 10900F has 20 MB. The L1 and L2 cache are identical at 64 KB and 256 KB per core, respectively. Memory support is similar with dual-channel DDR4, but the 10900F offers a higher memory bandwidth of 46.9 GB/s compared to 42.7 GB/s for the 9900KS. The 9900KS includes integrated UHD 630 graphics, whereas the 10900F has no integrated graphics. Finally, the 9900KS has an unlocked multiplier, while the 10900F is locked, a detail that will matter to overclockers.

Head-to-Head Benchmarks

The head-to-head data provides a clear narrative of where each CPU excels. The 9900KS's strength in gaming-like or latency-sensitive tasks is evident in the 3DMark results. In the 3DMark 2-thread test, it scores 1670 versus 1608, a 3.9% lead. The gap widens to 6% in the 4-thread test (3276 vs 3091) and peaks at 7.1% in the 8-thread test (5787 vs 5404). Even in the 16-thread test, it manages a 1.4% win (7376 vs 7274). These results indicate that the 9900KS's higher base clock and tuned design provide a significant edge when core counts are moderate.

The 10900F's counter-attack comes in the most demanding scenarios. The 3DMark max threads test flips the script, with the 10900F scoring 7866 against the 9900KS's 7360, a 6.4% victory. The Cinebench results reinforce this pattern. In Cinebench R23 multicore, the 10900F scores 16753, edging out the 9900KS's 16446 by 1.8%. The single-core Cinebench tests also favor the 10900F, albeit slightly, with a 1.9% lead in R23 single-core (2365 vs 2321). The most dramatic outlier is Geekbench multicore, where the 9900KS scores 9771 compared to the 10900F's 8447, a 15.7% blowout. This suggests that Geekbench's workload may not scale perfectly with the 10900F's additional cores and instead rewards the 9900KS's higher clock speeds and lower latency. This is a curious result, as it contradicts the Cinebench results, and highlights how different benchmark suites can tell different stories.

FAQ

Q: Which CPU is faster in single-threaded workloads?

A: The Intel Core i9-10900F has a slight edge. It wins the Cinebench R23 single-core test with a score of 2365 versus 2321 for the 9900KS, a 1.9% difference. However, the 9900KS wins the 3DMark single-thread test (841 vs 822) and Geekbench single-core test (1715 vs 1708), making the results benchmark-dependent.

Q: Is the Core i9-10900F better for multi-threaded rendering?

A: Yes, the data supports this. The 10900F wins all Cinebench R15, R20, and R23 multicore tests by roughly 1.8%. Its advantage is most pronounced in the 3DMark max threads test, where it leads by 6.4% (7866 vs 7360), which likely reflects the benefit of its 10 cores and 20 threads.

Q: Why does the Core i9-9900KS win Geekbench multicore by so much?

A: The Geekbench multicore result is a significant anomaly. The 9900KS scores 9771, which is 15.7% higher than the 10900F's 8447. This indicates that Geekbench's specific workload does not effectively utilize the 10900F's extra cores, and instead, the 9900KS's higher clock speeds and architecture are more beneficial.

Q: Which processor consumes more power?

A: The Intel Core i9-9900KS has a higher TDP of 127 W, while the Intel Core i9-10900F is rated at 65 W. This is notable since the 10900F has more cores, suggesting it is designed for better power efficiency.

Q: Do these CPUs support overclocking?

A: Yes, the Intel Core i9-9900KS has an unlocked multiplier, making it overclockable. The Intel Core i9-10900F does not have an unlocked multiplier, so its overclocking capability is limited.

Q: Do both processors support ECC memory?

A: No, neither the Intel Core i9-9900KS nor the Intel Core i9-10900F supports ECC memory.

Specification Differences

• Cores / Threads: 8 / 16 (9900KS) vs 10 / 20 (10900F)
• Base Clock: 4.00 GHz (9900KS) vs 2.80 GHz (10900F)
• Boost Clock: 5.00 GHz (9900KS) vs 5.20 GHz (10900F)
• TDP: 127 W (9900KS) vs 65 W (10900F)
• Socket: Intel Socket 1151 (9900KS) vs Intel Socket 1200 (10900F)
• Architecture / Codename: Coffee Lake / Coffee Lake-R (9900KS) vs Comet Lake / Comet Lake (10900F)
• Generation: Core i9 (Coffee Lake Refresh) vs Core i9 (Comet Lake)
• Die Size: 180 mm² (9900KS) vs Not specified (10900F)
• L3 Cache: 16 MB shared (9900KS) vs 20 MB shared (10900F)
• Memory Bandwidth: 42.7 GB/s (9900KS) vs 46.9 GB/s (10900F)
• Integrated Graphics: UHD 630 (9900KS) vs None (10900F)
• Multiplier Unlocked: Yes (9900KS) vs No (10900F)
• Part Number: SRG1Q (9900KS) vs SRH90 (10900F)

The Verdict

The data presents a clear, if nuanced, verdict. For users whose primary workloads involve gaming, general desktop responsiveness, or applications that are sensitive to low core counts and high clock speeds, the Intel Core i9-9900KS is the superior choice. Its wins in the 3DMark 2, 4, and 8-thread tests, combined with a massive 15.7% lead in Geekbench multicore, indicate that it offers better performance for tasks that do not scale perfectly across many cores. The 9900KS is also the only one of the two with an unlocked multiplier, which appeals to enthusiasts seeking to push performance further.

On the other hand, the Intel Core i9-10900F is the better option for content creators and professionals who run heavily multi-threaded applications like video rendering or 3D modeling. Its consistent wins in the Cinebench suite and the 3DMark max threads test show that its two extra cores provide a tangible benefit in workloads that can utilize them. Furthermore, its significantly lower TDP of 65 W makes it a more power-efficient choice for sustained all-core workloads, despite its higher core count. The locked multiplier is a drawback, but for users who do not overclock, this is irrelevant. In summary, the 9900KS is the specialist for low-latency, high-frequency tasks, while the 10900F is the generalist for parallel processing, and the choice hinges entirely on which category your workload falls into.