Intel Core i9-14900KS vs Intel Core Ultra 7 356H Comparison

Where Each One Wins

The Intel Core i9-14900KS dominates the head-to-head comparison with 16 benchmark wins out of 17 recorded tests. The data shows a desktop processor designed for maximum throughput across nearly every workload category. Its victories span Cinebench R15, R20, and R23 in both single-core and multi-core tests, plus PassMark suites covering compression, encryption, extended instructions, floating-point math, integer math, multithreading, physics, random string sorting, and single-thread performance.

The Intel Core Ultra 7 356H secures exactly one win: PassMark find prime numbers, where it scores 327 against the i9-14900KS's 244, a delta of 25.4 percent in the mobile chip's favor. This single result points to a specific algorithmic advantage in prime-number enumeration, likely tied to the Panther Lake architecture's per-core L1 cache of 192 KB compared to the Raptor Lake's 80 KB per core.

The use-case split is sharp. The i9-14900KS is the clear choice for multi-core rendering, heavy computation, and data-intensive tasks. Its Cinebench R23 multi-core score of 50995 versus 18395 for the Ultra 7 356H represents a 177.2 percent lead, which translates to vastly shorter render times and faster batch processing. Single-core workloads also favor the desktop part decisively: Cinebench R23 single-core shows 7199 versus 2040, a 252.9 percent gap that reflects the 6.20 GHz boost clock against the Ultra 7's 4.70 GHz.

The Ultra 7 356H, by contrast, wins in the context of efficiency and portability. It carries a 25 W TDP versus the i9-14900KS's 150 W, making it suitable for thin-and-light mobile systems where sustained high power draw is not feasible. Its 16 cores and 16 threads (no hyperthreading, as indicated by matching core and thread counts) deliver adequate performance for everyday tasks, as shown by its 87th percentile ranking among all CPUs, while the i9-14900KS sits at the 96th percentile.

The average benchmark scores reinforce the split: the i9-14900KS averages 81127, while the Ultra 7 356H averages 41215, a factor of roughly two. The nearest rivals in the database for the i9-14900KS include the Intel Xeon w5-3535X at 81115 and AMD Ryzen 9 8940HX at 81103, both with a delta of 0 percent, indicating that the desktop chip sits at parity with those workstation and high-end mobile parts. The Ultra 7 356H's nearest rivals include the AMD Ryzen AI 5 PRO 440 at 41208 and the Intel Core Ultra 7 366H at 41263, with deltas around 0 percent, showing it is positioned among mid-range mobile processors.

The Verdict

The benchmark data indicates that the Intel Core i9-14900KS is the superior processor for raw performance in virtually every measured category. Users who require maximum compute throughput for rendering, simulation, data compression, or encryption should select this part. Its 24 cores and 32 threads, combined with a 6.20 GHz boost clock and 36 MB of shared L3 cache, deliver class-leading results that place it in the 96th percentile of all CPUs. The launch MSRP is $689, and it supports DDR4 and DDR5 memory with ECC capability, making it a fit for professional workstations.

The Intel Core Ultra 7 356H serves a different purpose. As a mobile processor with a 25 W TDP, it targets laptops and compact systems where power efficiency matters more than peak throughput. Its 16 cores and 16 threads, 18 MB of shared L3 cache, and 115.2 GB/s memory bandwidth (via DDR5 and LPDDR5X) provide competent performance for general productivity, web browsing, and light content creation. The 87th percentile ranking confirms it is above average but not in the top tier.

No single workload in the database, apart from prime-number finding, favors the Ultra 7 356H. For users who prioritize battery life, portability, and adequate performance, the Ultra 7 356H is the appropriate choice. For users who prioritize speed and are willing to accept higher power consumption and a desktop socket, the i9-14900KS is the clear winner. The data does not support any other conclusion.

Head-to-Head Benchmarks

The largest single-core victory for the i9-14900KS comes in Cinebench R23 single-core, where it scores 7199 against the Ultra 7 356H's 2040, a delta of 252.9 percent. This result is consistent with the 6.20 GHz boost clock versus 4.70 GHz, and it shows that the desktop part's high-frequency design delivers an overwhelming advantage in single-threaded workloads.

In multi-core Cinebench R23, the i9-14900KS scores 50995 versus 18395, a 177.2 percent lead. The combination of more cores (24 versus 16), more threads (32 versus 16), and a larger shared L3 cache (36 MB versus 18 MB) explains this gap. The i9-14900KS also wins Cinebench R15 multi-core with 5140 versus 3055 (68.2 percent) and Cinebench R20 multi-core with 21417 versus 12153 (76.2 percent).

The PassMark integer math test shows a 155.9 percent advantage for the i9-14900KS, scoring 212644 versus 83111. Data compression follows with 803368 versus 336177, a 139 percent lead. Random string sorting shows 89789 versus 40990, a 119.1 percent gap. These results indicate that the desktop chip handles data transformation and sorting tasks far more efficiently.

The i9-14900KS wins PassMark multithread with 60012 versus 33978 (76.6 percent) and PassMark data encryption with 47717 versus 26345 (81.1 percent). Floating-point math favors the desktop part by 49.3 percent (153975 versus 103128). Extended instructions show a 63.2 percent lead (45524 versus 27898). PassMark physics is closer, with 3381 versus 2895, a 16.8 percent margin. Single-thread PassMark shows 4815 versus 4072, an 18.2 percent difference.

The sole Ultra 7 356H win is PassMark find prime numbers: 327 versus 244, a 25.4 percent margin. This is a specialized test that measures algorithmic efficiency in prime-number generation, and the mobile chip's higher L1 cache per core (192 KB versus 80 KB) may contribute to its advantage in this specific workload.

FAQ

Q: Which processor has the higher boost clock speed?

A: The Intel Core i9-14900KS has a boost clock of 6.20 GHz, while the Intel Core Ultra 7 356H has a boost clock of 4.70 GHz.

Q: How many cores and threads does each processor have?

A: The i9-14900KS has 24 cores and 32 threads. The Ultra 7 356H has 16 cores and 16 threads.

Q: What is the TDP difference between the two processors?

A: The i9-14900KS has a TDP of 150 W, while the Ultra 7 356H has a TDP of 25 W.

Q: Does the Ultra 7 356H win any benchmark against the i9-14900KS?

A: Yes, the Ultra 7 356H wins the PassMark find prime numbers test with a score of 327 versus 244 for the i9-14900KS, a 25.4 percent advantage.

Q: What memory types do the two processors support?

A: The i9-14900KS supports DDR4 and DDR5. The Ultra 7 356H supports DDR5 and LPDDR5X.

Q: Which processor has a higher percentile ranking among all CPUs?

A: The i9-14900KS ranks in the 96th percentile, while the Ultra 7 356H ranks in the 87th percentile.

Architecture Differences

The two processors belong to different Intel generations and use distinct architectures. The Intel Core i9-14900KS is part of the Core 14th Gen series, based on the Raptor Lake architecture with the codename Raptor Lake-R. It uses a 10 nm process node fabricated by Intel. The die size is 257 mm². The processor uses Intel Socket 1700 and targets the desktop market segment. It has an unlocked multiplier, allowing overclocking.

The Intel Core Ultra 7 356H belongs to the Core Ultra Series 3, based on the Panther Lake architecture with the codename Panther Lake. It uses a 3 nm process node, also fabricated by Intel. The die size is not recorded in the database. It uses Intel BGA 2540 and targets the mobile market segment. The multiplier is locked, preventing user overclocking.

Cache structures differ significantly. The i9-14900KS has 80 KB of L1 cache per core, 2 MB of L2 cache per core, and 36 MB of shared L3 cache. The Ultra 7 356H has 192 KB of L1 cache per core, 2.5 MB of L2 cache per core, and 18 MB of shared L3 cache. The larger per-core L1 and L2 caches on the Ultra 7 356H may explain its advantage in the prime-number test, while the larger total L3 on the i9-14900KS supports its multi-core dominance.

Memory support also differs. The i9-14900KS supports DDR4 and DDR5 in a dual-channel configuration and includes ECC memory support. The Ultra 7 356H supports DDR5 and LPDDR5X in a dual-channel configuration with a recorded memory bandwidth of 115.2 GB/s, but it does not support ECC memory. PCIe connectivity varies as well: the i9-14900KS provides Gen 5 with 16 lanes (CPU only), while the Ultra 7 356H provides Gen 5 with 12 lanes (CPU only).

Integrated graphics differ by generation. The i9-14900KS uses UHD Graphics 770, while the Ultra 7 356H uses Intel Xe3 Graphics. The release dates are also distinct: the i9-14900KS was released on 2024-03-13, and the Ultra 7 356H was released on 2026-01-04. The part numbers are SRN7R for the i9-14900KS and SA4RGQ9EU for the Ultra 7 356H. Both processors are active in production status. The i9-14900KS has a launch MSRP of $689; the Ultra 7 356H has no recorded launch MSRP.