Intel Core i9-13900KS vs Intel Core Ultra 7 265F Comparison

The Intel Core Ultra 7 265F and the Intel Core i9-13900KS represent two distinct philosophies in desktop processing: one is a modern, power-efficient architecture built on a leading-edge process, while the other is a high-frequency, high-core-count flagship from the previous generation. The benchmark data reveals a clear split: the i9-13900KS dominates in raw multi-threaded throughput and most legacy workloads, while the Ultra 7 265F counters with significant wins in floating-point math, prime number finding, and a marginal lead in single-threaded PassMark tests. The average benchmark scores are remarkably close, with the Ultra 7 265F at 64,438 and the i9-13900KS at 64,051, a difference of only 0.6% in favor of the newer chip, yet the distribution of wins is heavily skewed (13 vs 4) toward the older processor.

Where Each One Wins

The Intel Core i9-13900KS is the clear winner for multi-threaded productivity and content creation. Its 24 cores and 32 threads provide a substantial advantage in heavily parallel workloads like Cinebench rendering, where it leads by 18.3% across all three Cinebench R15, R20, and R23 multicore tests. This advantage extends to data compression, where the i9-13900KS scores 814,838 versus the Ultra 7's 507,018, a massive 37.8% lead, and integer math, where it wins by 34.6%. The PassMark multithread score also favors the i9-13900KS by 18.5%, suggesting that any application that can utilize more than a few cores will see a significant performance benefit from the older chip.

In contrast, the Intel Core Ultra 7 265F wins in specific, but notable, computational areas. Its most dramatic victory is in the PassMark find prime numbers test, where it scores 416 against the i9-13900KS's 257, a 61.9% advantage. This suggests a fundamentally more efficient architecture for certain types of integer operations. It also wins in floating-point math by 12.3%, scoring 173,855 versus 154,805, indicating superior handling of scientific and engineering calculations. The Ultra 7 265F also edges out the i9-13900KS in the PassMark single-thread test by a narrow 0.8%, scoring 4,750 versus 4,712, which is surprising given the i9's much higher 6.00 GHz boost clock. The data implies the Ultra 7 is the better choice for users whose primary workloads involve complex mathematical modeling, scientific simulation, or other floating-point heavy tasks, while the i9-13900KS is the go-to for general multi-threaded rendering and compression.

Architecture Differences

The fundamental split begins with the process node. The Ultra 7 265F is built on a 3 nm process fabricated by TSMC, while the i9-13900KS uses a 10 nm process from Intel. This generational shift explains the Ultra 7's superior power efficiency, reflected in its 65W TDP versus the i9's 150W TDP. The core configurations also differ philosophically: the Ultra 7 265F uses 20 cores and 20 threads, indicating no hyperthreading, while the i9-13900KS offers 24 cores and 32 threads. The Ultra 7 features a larger L2 cache at 3 MB per core compared to the i9's 2 MB per core, but the i9 counters with a larger shared L3 cache of 36 MB versus the Ultra 7's 30 MB. The L1 cache also differs, with the Ultra 7 having 192 KB per core and the i9 having 80 KB per core.

Memory support is another key differentiator. The Ultra 7 265F supports only DDR5 memory with a dual-channel bus, while the i9-13900KS supports both DDR4 and DDR5. The Ultra 7 has a higher theoretical memory bandwidth of 102.4 GB/s compared to the i9's 89.6 GB/s. The i9-13900KS also features integrated graphics (UHD Graphics 770), while the Ultra 7 265F has none, requiring a discrete GPU. Both use the same PCIe Gen 5 with 20 lanes, but the Ultra 7 requires the newer Intel Socket 1851, whereas the i9 uses Socket 1700. The i9 is also multiplier-unlocked for overclocking, while the Ultra 7 is locked. The i9 was released in January 2023 with a launch MSRP of $699; the Ultra 7 was released in January 2025 with a launch MSRP of $379.

Head-to-Head Benchmarks

The Cinebench tests paint a consistent picture. Across all three versions (R15, R20, R23), the i9-13900KS wins the multicore tests by exactly 18.3% and the single-core tests by 18.2% to 18.3%. For instance, in Cinebench R23 multicore, the i9 scores 51,368 versus the Ultra 7's 41,980. This consistency suggests a fundamental performance-per-clock advantage for the i9 in these rendering workloads, likely due to its higher boost clock of 6.00 GHz and additional threads.

The PassMark suite reveals a more nuanced story. The i9-13900KS wins data compression by 37.8% (814,838 vs 507,018) and data encryption by 17.4% (47,772 vs 39,468), showing strength in memory-intensive and security-related tasks. It also wins extended instructions by 18.6% and integer math by 34.6% (211,027 vs 138,078). However, the Ultra 7 265F's wins are not marginal. Its 61.9% victory in find prime numbers (416 vs 257) and 12.3% win in floating-point math (173,855 vs 154,805) are significant. The PassMark multithread score still favors the i9 by 18.5% (60,644 vs 49,410), and physics by 7.8%. The random string sorting test is another sizable win for the i9 at 30.8% (90,257 vs 62,439). The only essentially tied result is the PassMark single-thread test, where the Ultra 7's 4,750 edges out the i9's 4,712 by 0.8%.

The Verdict

Based strictly on the benchmark data, the Intel Core i9-13900KS is the superior processor for the vast majority of demanding applications. Its wins in Cinebench, data compression, and integer math are substantial, making it the clear choice for video rendering, file archiving, and general heavy multi-threaded productivity. The data shows it is the stronger performer in 13 of the 17 head-to-head tests, and its lead in the most common productivity benchmarks is consistently around 18%.

The Intel Core Ultra 7 265F, however, is not without its merits. Its significant advantages in floating-point math and prime number finding are indicative of an architecture that excels in specific scientific or analytical workloads. Its near-parity in single-threaded performance, despite a massive 0.70 GHz lower boost clock, reflects the efficiency of the Arrow Lake architecture. The data suggests that a user whose primary applications are heavily reliant on floating-point calculations—such as certain types of financial modeling or scientific simulation—might find the Ultra 7 to be a more suitable, and significantly less power-hungry, option. For everyone else, the i9-13900KS is the performance king according to these benchmarks.

FAQ

Q: Which processor is faster in multi-core rendering tasks?

A: The Intel Core i9-13900KS is consistently faster. It wins the Cinebench R23 multicore test with a score of 51,368 versus the Ultra 7 265F's 41,980, a lead of 18.3%.

Q: The Ultra 7 265F has a lower clock speed, but does it win any performance tests?

A: Yes. Despite its 5.30 GHz boost clock versus the i9's 6.00 GHz, the Ultra 7 265F wins the PassMark floating-point math test by 12.3% and the find prime numbers test by a massive 61.9%.

Q: How do the two processors compare in single-threaded performance?

A: They are nearly identical. The Ultra 7 265F scores 4,750 in the PassMark single-thread test, while the i9-13900KS scores 4,712, giving the Ultra 7 a very narrow 0.8% lead.

Q: What are the key architectural differences that explain the performance gap?

A: The Ultra 7 265F uses a 3 nm TSMC process with 20 cores and 20 threads, while the i9-13900KS uses a 10 nm Intel process with 24 cores and 32 threads. The i9 also has a larger 36 MB L3 cache versus the Ultra 7's 30 MB.

Q: Does the Intel Core Ultra 7 265F support overclocking?

A: No, the multiplier is locked. The Intel Core i9-13900KS is multiplier-unlocked, allowing for overclocking.

Q: Which CPU has a higher theoretical memory bandwidth?

A: The Intel Core Ultra 7 265F supports DDR5 memory with a bandwidth of 102.4 GB/s. The i9-13900KS, which also supports DDR4, has a lower bandwidth of 89.6 GB/s.

Specification Differences

• Cores: 20 (Ultra 7 265F) vs 24 (i9-13900KS)
• Threads: 20 (Ultra 7 265F) vs 32 (i9-13900KS)
• Base Clock: 2.40 GHz (Ultra 7 265F) vs 3.20 GHz (i9-13900KS)
• Boost Clock: 5.30 GHz (Ultra 7 265F) vs 6.00 GHz (i9-13900KS)
• TDP: 65 W (Ultra 7 265F) vs 150 W (i9-13900KS)
• Process Node: 3 nm (Ultra 7 265F) vs 10 nm (i9-13900KS)
• Foundry: TSMC (Ultra 7 265F) vs Intel (i9-13900KS)
• Die Size: 243 mm² (Ultra 7 265F) vs 257 mm² (i9-13900KS)
• L1 Cache: 192 KB (per core) (Ultra 7 265F) vs 80 KB (per core) (i9-13900KS)
• L2 Cache: 3 MB (per core) (Ultra 7 265F) vs 2 MB (per core) (i9-13900KS)
• L3 Cache: 30 MB (shared) (Ultra 7 265F) vs 36 MB (shared) (i9-13900KS)
• Memory Support: DDR5 (Ultra 7 265F) vs DDR4, DDR5 (i9-13900KS)
• Memory Bandwidth: 102.4 GB/s (Ultra 7 265F) vs 89.6 GB/s (i9-13900KS)
• ECC Memory: No (Ultra 7 265F) vs Yes (i9-13900KS)
• Integrated Graphics: N/A (Ultra 7 265F) vs UHD Graphics 770 (i9-13900KS)
• Socket: Intel Socket 1851 (Ultra 7 265F) vs Intel Socket 1700 (i9-13900KS)
• Multiplier Unlocked: No (Ultra 7 265F) vs Yes (i9-13900KS)
• Launch MSRP: $379 (Ultra 7 265F) vs $699 (i9-13900KS)
• Release Date: 2025-01-06 (Ultra 7 265F) vs 2023-01-11 (i9-13900KS)