Intel Core Ultra 5 245K vs Intel Core Ultra 5 245KF Comparison

The Intel Core Ultra 5 245KF and Intel Core Ultra 5 245K are near-identical Arrow Lake-S desktop processors, both built on a 3 nm TSMC process with 14 cores and 14 threads, a 4.20 GHz base clock, a 5.20 GHz boost clock, a 125 W TDP, and 24 MB of shared L3 cache. The two differ in integrated graphics, ECC memory support, and launch MSRP, and their benchmark results show only fractional separations, with the 245KF holding a slightly higher average score of 55,421 versus 55,304 for the 245K. This analysis examines where each chip wins, what the architecture differences mean, and which processor the data favors for specific workloads.

FAQ

Q: What is the difference in integrated graphics between the two CPUs?

A: The Intel Core Ultra 5 245K includes Arc Xe-LPG Graphics with 64 execution units, while the 245KF has no integrated graphics at all. This is the most significant feature split between the two chips.

Q: Does either CPU support ECC memory?

A: Yes, the 245K supports ECC memory, while the 245KF does not. This makes the 245K the only choice for systems that require error-correcting memory.

Q: What are the launch MSRPs of the two processors?

A: The 245KF has a launch MSRP of $294, and the 245K has a launch MSRP of $319. The 245KF is $25 cheaper at launch.

Q: Which CPU has the higher average benchmark score?

A: The 245KF has an average benchmark score of 55,421, while the 245K scores 55,304. The 245KF is 0.2% higher, a margin that is effectively negligible in real-world terms.

Q: How many head-to-head benchmark wins does each processor claim?

A: Out of 17 head-to-head tests, the 245K wins 10 and the 245KF wins 7. However, the 245K's wins are often by tiny margins, with one notable exception in the physics test.

Q: Are the core and thread counts identical?

A: Yes, both CPUs have 14 cores and 14 threads, with no hyper-threading. They also share the same cache hierarchy: 192 KB L1 per core, 3 MB L2 per core, and 24 MB shared L3.

Where Each One Wins

The benchmark data reveals a clear split in workload strengths. The Intel Core Ultra 5 245K dominates in rendering and physics-based workloads. It wins all six Cinebench tests (R15, R20, R23, both single- and multi-core) by 0.2% to 0.3% margins. More decisively, it leads by 7.3% in PassMark physics (3,348 vs. 3,105) and by 1.9% in find prime numbers (423 vs. 415). It also edges out the 245KF in PassMark multithread (43,527 vs. 43,422) and random string sorting (55,882 vs. 55,709).

The Intel Core Ultra 5 245KF, on the other hand, wins in data processing and single-thread tasks. It leads in PassMark data compression (463,378 vs. 462,110), data encryption (33,641 vs. 33,481), extended instructions (38,020 vs. 37,822), floating point math (132,037 vs. 131,107), and integer math (98,936 vs. 98,850). It also wins the PassMark single-thread test (4,717 vs. 4,700). These wins are small—ranging from 0.1% to 0.7%—but they are consistent across several math and cryptographic workloads.

For users who prioritize physics simulation, prime number calculations, or pure multi-threaded rendering, the 245K is the better performer. For those who need encryption, compression, or single-thread responsiveness, the 245KF holds a slight edge.

Architecture Differences

Both processors are built on the same Arrow Lake-S architecture, fabricated on a 3 nm process at TSMC, with 17,800 million transistors on a 243 mm² die. They share the same core configuration: 14 cores and 14 threads, with no hyper-threading, and identical cache sizes (192 KB L1 per core, 3 MB L2 per core, 24 MB shared L3). Memory support is also identical—DDR5, dual-channel, with 102.4 GB/s bandwidth—and both use the Intel Socket 1851 with Gen 5 PCIe (20 lanes CPU-only). The only architectural differences are the presence of an integrated GPU and ECC support on the 245K. The 245K includes an Arc Xe-LPG Graphics engine with 64 execution units; the 245KF has no iGPU. The 245K also enables ECC memory, while the 245KF does not. These are the sole differentiators beyond pricing and part numbers.

Because the core microarchitecture, cache hierarchy, and memory controller are identical, the performance differences observed in benchmarks likely stem from minor binning variations or the extra power/thermal headroom available when the iGPU is absent. The 245KF's slightly higher average score (55,421 vs. 55,304) and its wins in math-intensive tasks suggest that the lack of an iGPU may allow slightly more consistent boosting, but the data cannot confirm this mechanism. What is clear is that the architectural foundation is the same; the feature set is what separates them.

Specification Differences

The following table summarizes the only fields where the two CPUs differ:

| Specification | Intel Core Ultra 5 245KF | Intel Core Ultra 5 245K |

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

| Integrated Graphics | None | Arc Xe-LPG Graphics 64EU |

| ECC Memory | No | Yes |

| Launch MSRP | $294 | $319 |

| Part Number | SRQCY | SRQCT |

All other specifications—cores, threads, clocks, TDP, socket, process node, cache, memory support, PCIe, and multiplier unlock—are identical. Both are unlocked for overclocking, both have a base clock of 4.20 GHz and boost clock of 5.20 GHz, and both are listed as Active production status with a release date of 2024-10-23.

Head-to-Head Benchmarks

The head-to-head results show a tight contest with a few notable outliers. The 245K's largest win is in PassMark physics, where it scores 3,348 versus the 245KF's 3,105—a 7.3% advantage. This is by far the biggest delta in the entire comparison. The next-largest win for the 245K is in PassMark find prime numbers: 423 vs. 415, a 1.9% lead. In Cinebench R23 multi-core, the 245K scores 37,001 against 36,908, a 0.3% edge; in R23 single-core it scores 5,223 vs. 5,210, a 0.2% edge. The 245K also wins PassMark multithread (43,527 vs. 43,422, -0.2%) and random string sorting (55,882 vs. 55,709, -0.3%).

The 245KF's wins are smaller but cover a broader range of math and data tasks. Its largest win is in PassMark floating point math: 132,037 vs. 131,107, a 0.7% advantage. It leads by 0.5% in both data encryption (33,641 vs. 33,481) and extended instructions (38,020 vs. 37,822). In data compression, it scores 463,378 vs. 462,110 (0.3% higher), and in integer math it scores 98,936 vs. 98,850 (0.1% higher). The 245KF also wins PassMark single-thread by 0.4% (4,717 vs. 4,700).

When averaging all benchmark scores, the 245KF edges ahead with 55,421 versus 55,304, a 0.2% difference. This aligns with the nearest-rival data: the 245KF is 0.2% above the 245K, while the 245K is 0.2% below the 245KF. Both chips sit at the 94th percentile among all CPUs, and they are closely bracketed by the Intel Core i9-14900T (average 55,778) and AMD Ryzen 9 9900X3D (54,681).

The Verdict

The data paints a clear picture: the Intel Core Ultra 5 245KF and 245K are functionally the same processor, with the only meaningful differences being the integrated GPU, ECC support, and launch price. The 245K wins more individual tests (10 vs. 7), but its wins are mostly marginal—except for physics, where it is 7.3% faster. The 245KF wins fewer tests but takes the overall average score by a hair (55,421 vs. 55,304) and does so while carrying a lower launch MSRP of $294 versus $319.

For a user who needs integrated graphics—perhaps for a build without a discrete GPU or for Quick Sync-style encoding—the 245K is the only option. Similarly, if ECC memory is a requirement, the 245K is mandatory. In those cases, the 245K's slightly higher price is justified by the added features.

For everyone else, the 245KF offers a marginally higher average benchmark score and a lower launch MSRP. The performance differences are so small that they will be imperceptible in most applications; the 245KF's wins in encryption, compression, and floating-point math might be relevant for specific workloads, while the 245K's physics advantage could matter for simulation tasks. But given the 0.2% average difference and the $25 price gap, the 245KF is the more rational choice when the iGPU and ECC are not needed. The data does not show any scenario where the 245K's extra features translate into a meaningful performance lead outside of the physics test, so the decision ultimately rests on feature requirements rather than raw speed.