Intel Core i9-13900K vs Intel Core i9-13900KF Comparison

The Intel Core i9-13900KF and Intel Core i9-13900K are near-identical twins on paper, sharing the same 24-core, 32-thread Raptor Lake-S configuration, the same 3.00 GHz base clock, and the same 5.80 GHz boost clock. The database shows they are separated by a hair in average benchmark score—61841 for the KF versus 61766 for the K, a delta of just 0.1%. Yet the head-to-head results reveal a fascinating split: the K wins 20 of 25 tests, but the KF wins the two most extreme single-core Cinebench tests by enormous margins. The question is not which is faster overall—they are effectively tied—but which one wins where, and whether the KF’s outlier results are a statistical artifact or a genuine performance signature.

Where Each One Wins

The use-case split is stark. The Intel Core i9-13900K dominates the multi-threaded and general-purpose workload categories, taking 20 of the 25 head-to-head benchmarks. Its wins include every PassMark test listed, from data compression (793645 vs 786218) to integer math (207792 vs 206859) to multithread (58589 vs 57729). It also wins all four 3DMark threaded tests, with the largest margin in the max-threads run (15509 vs 15405, a 0.7% advantage). This indicates that for sustained, heavily threaded workloads like rendering, physics simulation, or data encryption, the 13900K holds a consistent, if small, edge.

The Intel Core i9-13900KF, by contrast, wins only 5 tests, but they are concentrated in single-core and specific Cinebench runs. It takes the 3DMark single-thread test (1188 vs 1187, a 0.1% margin) and Geekbench single-core (2668 vs 2628, a 1.5% edge). More dramatically, it wins Cinebench R15 single-core (695 vs 318, a 118.6% delta) and Cinebench R23 single-core (6897 vs 2238.5, a 208.1% delta), plus Cinebench R23 multi-core (48855 vs 38271.5, a 27.7% delta). These are not incremental wins; they are massive outliers that suggest the KF’s benchmark data includes runs with different thermal or power conditions, rather than a true architectural advantage.

Architecture Differences

Architecturally, the two processors are nearly identical, which makes the benchmark divergence all the more curious. Both use the Raptor Lake architecture on a 10 nm process node from Intel, with a die size of 257 mm². They share the same cache hierarchy: 80 KB L1 per core, 2 MB L2 per core, and 36 MB shared L3. Both support DDR4 and DDR5 memory in a dual-channel configuration, and both support ECC memory. The core count, thread count, base clock, boost clock, and TDP (125) are all the same.

The only meaningful specification differences are the integrated graphics and PCIe lane count. The 13900K includes UHD Graphics 770, while the 13900KF has no integrated graphics—the “F” suffix indicates a disabled iGPU. This also explains the PCIe difference: the KF lists Gen 5 with 20 lanes (CPU only), while the K lists Gen 5 with 16 lanes (CPU only). The 20-lane count on the KF is likely because with no iGPU, all lanes are dedicated to discrete graphics and storage. Both have unlocked multipliers, both are on the same Intel Socket 1700, and both launched on the same date with the same production status. The launch MSRP differs: $564 for the KF and $589 for the K, a $25 gap that reflects the missing iGPU.

Head-to-Head Benchmarks

The head-to-head data presents a split personality. In the 3DMark suite, the K wins all but one test, yet the margins are tiny. For 16 threads, the K scores 11201 against the KF’s 11177, a 0.2% difference. For 2 threads, it is 2355 vs 2353 (0.1%). For 4 threads, 4648 vs 4643 (0.1%). For 8 threads, 8520 vs 8510 (0.1%). The max-threads test shows a slightly larger gap: 15509 vs 15405, a 0.7% edge for the K. The single-thread 3DMark test flips, with the KF at 1188 and the K at 1187—a 0.1% KF win.

Cinebench is where the data gets wild. In R15 multi-core, the K wins decisively: 5805.5 vs 4924, a 15.2% margin. But in R15 single-core, the KF wins by 118.6% (695 vs 318). In R20, the K wins both multi-core (20740 vs 20519, 1.1%) and single-core (2927 vs 2896, 1.1%). Then in R23, the KF reverses with a 27.7% multi-core win (48855 vs 38271.5) and a 208.1% single-core win (6897 vs 2238.5). These R23 numbers are so far outside the pattern that they suggest the KF’s scores came from a system with different cooling or power limits, not from the chip itself.

Geekbench shows the K ahead in multi-core (22820 vs 22486, 1.5%) and the KF ahead in single-core (2668 vs 2628, 1.5%). PassMark is uniformly K territory, with deltas ranging from 0.4% in integer math to 5.9% in physics. The K wins data compression (793645 vs 786218, 0.9%), encryption (46609 vs 46186, 0.9%), extended instructions (46477 vs 46084, 0.8%), prime numbers (236 vs 225, 4.7%), floating point (151562 vs 150869, 0.5%), multithread (58589 vs 57729, 1.5%), random string sorting (87705 vs 86510, 1.4%), and single-thread (4608 vs 4584, 0.5%).

The Verdict

The data does not support a blanket “this one is faster” statement. For the vast majority of workloads—rendering, compression, encryption, physics, and general multi-threaded compute—the Intel Core i9-13900K is the safer pick. Its 20 wins out of 25 head-to-head tests, including every PassMark category, demonstrate a consistent edge that, while small (most under 1%), spans a wide range of tasks. The 5.9% lead in PassMark physics and 4.7% lead in prime number finding are the largest sustained wins for the K.

The Intel Core i9-13900KF is a different story. Its wins are concentrated in single-core tests and the anomalous Cinebench R23 results. The 208.1% single-core and 27.7% multi-core R23 victories are so extreme that they cannot be taken at face value as representative of the chip’s typical performance—they imply a test environment that favored the KF to an unusual degree. The more believable KF wins are the 1.5% Geekbench single-core margin and the 1.5% Geekbench multi-core deficit, which paint a picture of a chip that trades a small amount of multi-threaded performance for a slight single-thread edge.

The practical verdict: if you need a guaranteed, consistent performer across a broad suite of applications, the 13900K is the choice. If you are building a system with a discrete GPU and want to save $25 on launch MSRP, the 13900KF offers nearly identical performance, with the caveat that its Cinebench R23 numbers in this database look like outliers. Neither chip has a meaningful advantage in 3DMark threaded tests, where deltas are all under 1%.

FAQ

Q: Which CPU wins more head-to-head benchmarks?

A: The Intel Core i9-13900K wins 20 of the 25 head-to-head tests, while the Intel Core i9-13900KF wins 5.

Q: What is the biggest single-core advantage for the KF?

A: In Cinebench R23 single-core, the KF scores 6897 against the K’s 2238.5, a 208.1% delta.

Q: How large is the K’s largest multi-core win?

A: In Cinebench R15 multi-core, the K scores 5805.5 versus the KF’s 4924, a 15.2% margin.

Q: Do the two CPUs have the same core and thread counts?

A: Yes, both have 24 cores and 32 threads.

Q: What is the main hardware difference between them?

A: The 13900K includes UHD Graphics 770, while the 13900KF has no integrated graphics. The KF also lists 20 PCIe Gen 5 lanes (CPU only) versus 16 on the K.

Q: How do they compare in average benchmark score?

A: The KF has an average benchmark score of 61841, and the K has 61766, a delta of 0.1% favoring the KF.

Specification Differences

| Specification | Intel Core i9-13900KF | Intel Core i9-13900K |

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

| Launch MSRP | $564 | $589 |

| Integrated Graphics | None | UHD Graphics 770 |

| PCIe Lanes (CPU only) | Gen 5, 20 Lanes | Gen 5, 16 Lanes |

| Part Number | SRMBJ | SRMBH |

| Percentile vs All CPUs | 93 | 92 |

| Average Benchmark Score | 61841 | 61766 |

All other specifications—cores (24), threads (32), base clock (3.00 GHz), boost clock (5.80 GHz), TDP (125), socket (Intel Socket 1700), architecture (Raptor Lake), process node (10 nm), die size (257 mm²), cache (80 KB L1, 2 MB L2, 36 MB L3), memory support (DDR4, DDR5), memory bus (Dual-channel), ECC support (true), market segment (Desktop), production status (Active), release date (2022-09-26), and unlocked multiplier (true)—are identical between the two.