Intel Core i9-9900KF vs Intel Core i9-9900KS Comparison

The Intel Core i9-9900KS is the definitive choice for anyone seeking maximum performance from this platform. It wins every single head-to-head benchmark against the i9-9900KF, with margins ranging from a slim 0.5% in Geekbench single-core to a substantial 8.9% in Geekbench multi-core. The i9-9900KF is the correct pick only if you are building a system with a discrete GPU and want the same core architecture at a lower launch MSRP, sacrificing roughly 7-9% performance and the integrated graphics. The data is unambiguous: the 9900KS is the superior processor.

The Verdict

Benchmark results indicate a clear hierarchy. The i9-9900KS outperforms the i9-9900KF in all eight shared tests, making it the outright winner for performance-oriented builds. Its average benchmark score of 4738 places it at the 59th percentile of all CPUs, while the i9-9900KF’s average of 4652 sits at the 58th percentile. The 9900KS is not just faster; it is consistently faster, with a 7.5% lead in Cinebench R15 multi-core and a 7.6% lead in both Cinebench R20 multi-core and R23 single-core.

The i9-9900KF is for the builder who prioritizes a lower launch MSRP of $488 over the 9900KS’s $513 and already owns a graphics card. It lacks integrated graphics entirely, so it is unusable without a discrete GPU. However, the performance trade-off is significant: the 9900KF trails by 7.4% in Cinebench R15 single-core and by 8.9% in Geekbench multi-core. For pure compute, the 9900KS is the better investment. The 9900KF does not win a single benchmark and is only recommended when the absence of iGPU is a non-issue and the slightly lower launch price is paramount.

Architecture Differences

Both processors share the same fundamental architecture: Coffee Lake-R on a 14 nm process, built by Intel for the Desktop market segment. They feature 8 cores and 16 threads each, with identical cache layouts: 64 KB of L1 per core, 256 KB of L2 per core, and 16 MB of shared L3 cache. They both support DDR4 memory over a dual-channel bus with 42.7 GB/s bandwidth, do not support ECC memory, and provide PCIe Gen 3 with 16 lanes from the CPU. Both have unlocked multipliers for overclocking and are end-of-life products.

The architectural differences are limited to clock speeds, power, and integrated graphics. The base clock is the most significant internal divergence: the 9900KS runs at 4.00 GHz, while the 9900KF runs at 3.60 GHz. Both boost to 5.00 GHz. This 0.4 GHz base clock advantage for the 9900KS is the primary driver of its benchmark superiority. The 9900KS carries a 127 W TDP versus 95 W for the 9900KF, reflecting the higher base clock and its ability to sustain all-core boost states. The 9900KS includes Intel UHD 630 integrated graphics, while the 9900KF has no integrated graphics unit. The die size is also slightly different: 180 mm² for the 9900KS versus 180.3 mm² for the 9900KF, a negligible physical variance. Both share the same 16 MB shared L3 cache and the same 14 nm process node, confirming they are near-identical silicon with different factory configurations.

FAQ

Q: Which CPU has a higher base clock speed?

A: The Intel Core i9-9900KS has a base clock of 4.00 GHz, which is 0.4 GHz higher than the i9-9900KF’s 3.60 GHz. Both share the same 5.00 GHz boost clock.

Q: Does the i9-9900KF have integrated graphics?

A: No. The i9-9900KF has no integrated graphics (null value), whereas the i9-9900KS includes Intel UHD 630. The 9900KF requires a discrete GPU for any display output.

Q: How much faster is the i9-9900KS in multi-core workloads?

A: The 9900KS leads by 7.5% in Cinebench R15 multi-core (1657 vs 1541), 7.6% in Cinebench R20 multi-core (6907 vs 6422), and 8.9% in Geekbench multi-core (9771 vs 8970). In Cinebench R23 multi-core, it scores 16446 versus 15292, a 7.5% advantage.

Q: What is the performance difference in single-core tests?

A: The 9900KS wins all single-core tests. The smallest margin is in Geekbench single-core, where it scores 1715 versus 1706, a 0.5% lead. In Cinebench R23 single-core, the lead is 7.6% (2321 vs 2158), and in Cinebench R20 single-core it is 7.5% (974 vs 906).

Q: Which processor has a higher TDP?

A: The Intel Core i9-9900KS has a 127 W TDP, compared to 95 W for the i9-9900KF. This higher TDP aligns with its higher base clock and sustained performance advantage.

Q: What is the launch MSRP of each processor?

A: The i9-9900KS has a launch MSRP of $513, while the i9-9900KF has a launch MSRP of $488. The 9900KF is $25 cheaper at launch, but offers lower benchmark scores.

Specification Differences

The two processors differ in four key specification fields, with all other core attributes being identical.

• Base Clock: 4.00 GHz for the 9900KS versus 3.60 GHz for the 9900KF. This is the largest clock-speed difference between the two.
• TDP: 127 W for the 9900KS versus 95 W for the 9900KF. The 9900KS consumes and dissipates more power to sustain its higher base clock.
• Integrated Graphics: The 9900KS includes UHD 630; the 9900KF has no integrated graphics (null). This is a binary feature difference.
• Die Size: 180 mm² for the 9900KS versus 180.3 mm² for the 9900KF. This is a minor physical variance that has no measurable performance impact.
• Launch MSRP: $513 for the 9900KS versus $488 for the 9900KF. The 9900KF is the lower-priced part at launch.

All other specifications are identical: 8 cores, 16 threads, 5.00 GHz boost clock, 64 KB L1 per core, 256 KB L2 per core, 16 MB shared L3, DDR4 dual-channel memory with 42.7 GB/s bandwidth, no ECC, PCIe Gen 3 with 16 lanes, Intel Socket 1151, Coffee Lake-R architecture, and unlocked multipliers.

Head-to-Head Benchmarks

The i9-9900KS wins all eight head-to-head comparisons, but the margins tell a nuanced story. The largest victory is in Geekbench multi-core, where the 9900KS scores 9771 against the 9900KF’s 8970, a substantial 8.9% advantage. This is the biggest gap in any test and suggests the 9900KS’s higher base clock provides more consistent all-core throughput under sustained load. In Cinebench R20 multi-core, the lead is 7.6% (6907 vs 6422), and in Cinebench R23 multi-core it is 7.5% (16446 vs 15292). These multi-core results cluster tightly around 7.5-8.9%, indicating a stable performance advantage across different rendering engines.

Single-core results are more varied. The 9900KS leads Cinebench R23 single-core by 7.6% (2321 vs 2158) and Cinebench R20 single-core by 7.5% (974 vs 906). The Cinebench R15 single-core margin is 7.4% (233 vs 217). However, Geekbench single-core shows only a 0.5% difference, with the 9900KS scoring 1715 versus 1706. This near-tie is notable because both CPUs share the same 5.00 GHz boost clock, and Geekbench’s single-core test likely does not stress the base-clock advantage as heavily. The 9900KS’s wins are consistent in Cinebench but nearly negligible in Geekbench single-core, demonstrating that the benchmark methodology matters. The 9900KS also wins Cinebench R15 multi-core by 7.5% (1657 vs 1541), completing a clean sweep across every workload.

Where Each One Wins

The i9-9900KS wins everywhere in terms of raw performance. It is the superior choice for any workload that benefits from higher sustained clock speeds, including multi-threaded rendering, video encoding, and scientific computing. Its 127 W TDP and 4.00 GHz base clock allow it to maintain higher all-core frequencies, which translates directly to the 7.5-8.9% leads in Cinebench and Geekbench multi-core tests. It also wins single-core tests despite the identical 5.00 GHz boost clock, likely due to more favorable boost behavior or binning. Users who require integrated graphics for troubleshooting, quick-start systems, or hardware encoding will find the UHD 630 essential, and the 9900KS is the only option here.

The i9-9900KF wins only in cost. Its launch MSRP of $488 is $25 lower than the 9900KS’s $513. It also has a lower 95 W TDP, which may appeal to builders with smaller coolers or power-limited systems, though the data does not include cooler or wattage specifications. Its lack of integrated graphics is a strict disadvantage unless the user already owns a discrete GPU. The benchmark results show the 9900KF trailing by 7.4% to 8.9% in most tests, with only a 0.5% gap in Geekbench single-core. Therefore, the 9900KF is only the winner for a builder who absolutely must minimize upfront cost and does not need integrated graphics. For every performance metric, the 9900KS is the clear victor.