Intel Core i9-14900KS vs Intel Core Ultra 7 366H Comparison

FAQ

Q: How do the two processors compare in overall benchmark performance?

A: The Intel Core i9-14900KS records an average benchmark score of 81,127, placing it in the 96th percentile of all CPUs. The Intel Core Ultra 7 366H scores 41,263 on average, which places it in the 87th percentile. The desktop chip's average score is roughly double that of the mobile part.

Q: Which processor wins the majority of head-to-head benchmark tests?

A: The data shows 16 wins for the Intel Core i9-14900KS and 1 win for the Intel Core Ultra 7 366H across the 17 recorded head-to-head tests. The sole victory for the Ultra 7 comes in the PassMark find prime numbers test, where it scores 326 versus 244 for the i9-14900KS, a delta of -25.2 percent.

Q: What are the core and thread counts for each processor?

A: The Intel Core i9-14900KS has 24 cores and 32 threads. The Intel Core Ultra 7 366H has 16 cores and 16 threads. The i9-14900KS also features a higher base clock of 3.20 GHz versus 2.00 GHz and a higher boost clock of 6.20 GHz versus 4.80 GHz.

Q: How do the cache configurations differ?

A: The i9-14900KS uses 80 KB of L1 cache per core, 2 MB of L2 cache per core, and 36 MB of shared L3 cache. The Ultra 7 366H uses 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3 cache. The desktop part has double the L3 cache, while the mobile part has larger per-core L1 and L2 allocations.

Q: Which processor supports ECC memory?

A: The Intel Core i9-14900KS supports ECC memory. The Intel Core Ultra 7 366H does not list ECC memory support in its specifications.

Q: How do the nearest rivals compare for each processor?

A: The i9-14900KS's closest rival is the Intel Xeon w5-3535X with a delta of 0 percent, followed by the AMD Ryzen 9 8940HX also at 0 percent. The Ultra 7 366H's closest rival is the Intel Core Ultra 7 356H at 0.1 percent, and the AMD Ryzen 9 5900X trails by -0.3 percent.

The Verdict

The benchmark data paints a clear picture for distinct use cases. The Intel Core i9-14900KS is the choice for desktop workloads that demand maximum multi-threaded throughput. Its 24 cores, 32 threads, and 6.20 GHz boost clock deliver dominant scores across Cinebench and PassMark suites. The 96th percentile ranking and an average score of 81,127 place it far above the Ultra 7 366H, which sits at the 87th percentile with an average of 41,263.

The Intel Core Ultra 7 366H, by contrast, is a mobile processor with a 25 W TDP and a 3 nm process node. It targets efficiency and portability rather than raw performance. The data shows it wins only the PassMark find prime numbers test, where its 326 score outperforms the i9-14900KS's 244. This single win indicates a specific strength in prime number generation workloads, but it does not compensate for the broad performance gap elsewhere.

Users building a desktop workstation or high-end enthusiast PC should select the i9-14900KS. Its memory support includes DDR4 and DDR5, it offers ECC memory, and it uses PCIe Gen 5 with 16 CPU lanes. The Ultra 7 366H suits portable systems requiring integrated Intel Xe3 Graphics and LPDDR5X memory support, though its locked multiplier and lack of ECC limit flexibility. The i9-14900KS has an unlocked multiplier, making it the only one of the two suitable for overclocking.

Head-to-Head Benchmarks

The Cinebench results show overwhelming dominance by the i9-14900KS. In Cinebench R15 multi-core, the desktop chip scores 5,140 versus 2,870, a 79.1 percent advantage. The single-core R15 test shows 725 versus 405, also a 79 percent delta. Cinebench R20 multi-core delivers 21,417 for the i9-14900KS and 11,960 for the Ultra 7 366H, again a 79.1 percent gap. The R20 single-core result is 3,023 versus 1,688, matching the same 79.1 percent delta. Cinebench R23 multi-core records 50,995 for the i9-14900KS and 28,477 for the Ultra 7, with a 79.1 percent difference. The R23 single-core test shows 7,199 versus 4,020, preserving the identical 79.1 percent delta.

PassMark tests reveal even larger margins in some cases. The data compression test shows the i9-14900KS at 803,368 and the Ultra 7 366H at 327,455, a 145.3 percent lead. Integer math delivers 212,644 versus 83,695, a 154.1 percent advantage. Random string sorting shows 89,789 versus 39,814, or 125.5 percent. Data encryption scores 47,717 versus 25,845, a 84.6 percent margin. Extended instructions record 45,524 versus 26,901, a 69.2 percent gap. Floating point math comes in at 153,975 versus 103,615, a 48.6 percent lead. The multi-thread PassMark test shows 60,012 versus 33,429, a 79.5 percent delta. Physics scores 3,381 versus 2,880, a 17.4 percent advantage. Single-thread PassMark delivers 4,815 versus 4,043, a 19.1 percent gap.

The single exception is the PassMark find prime numbers test. Here the Ultra 7 366H scores 326, while the i9-14900KS scores 244. The delta is -25.2 percent, meaning the mobile processor is about a quarter faster in this specific workload. This anomaly suggests the newer Panther Lake architecture handles prime-number sieve operations more efficiently per clock, despite its lower boost clock of 4.80 GHz.

Specification Differences

The two processors differ across nearly every specification category. The i9-14900KS belongs to the Core 14th Gen series and uses the Raptor Lake architecture with the Raptor Lake-R codename. The Ultra 7 366H belongs to the Core Ultra Series 3 and uses the Panther Lake architecture with the Panther Lake codename.

Core and thread counts differ substantially: 24 cores and 32 threads for the desktop part, 16 cores and 16 threads for the mobile part. Base clocks are 3.20 GHz versus 2.00 GHz. Boost clocks are 6.20 GHz versus 4.80 GHz. The TDP values show a massive difference: 150 W for the i9-14900KS and 25 W for the Ultra 7 366H.

Sockets differ completely. The i9-14900KS uses Intel Socket 1700, while the Ultra 7 366H uses Intel BGA 2540. The process nodes differ as well: 10 nm for the desktop chip and 3 nm for the mobile chip. The die size is recorded as 257 mm² for the i9-14900KS, while the Ultra 7 366H has no recorded die size.

Memory support shows DDR4 and DDR5 for the desktop part, while the mobile part supports DDR5 and LPDDR5X. The Ultra 7 366H lists a memory bandwidth of 115.2 GB/s, while the i9-14900KS has no recorded memory bandwidth figure. ECC memory is supported on the i9-14900KS but not on the Ultra 7 366H. PCIe lanes differ: 16 lanes for the desktop chip versus 12 lanes for the mobile chip, both at Gen 5.

Integrated graphics differ: UHD Graphics 770 on the i9-14900KS versus Intel Xe3 Graphics on the Ultra 7 366H. The market segments are Desktop versus Mobile. The release dates are 2024-03-13 for the desktop chip and 2026-01-04 for the mobile chip. The i9-14900KS has a launch MSRP of $689, while the Ultra 7 366H has no recorded launch MSRP. The multiplier is unlocked on the i9-14900KS and locked on the Ultra 7 366H.

Architecture Differences

The architectural split is generational and process-driven. The i9-14900KS uses Raptor Lake, built on Intel's 10 nm process with a die size of 257 mm². The Ultra 7 366H uses Panther Lake, built on a 3 nm process with no recorded die size. This process shrink explains the mobile chip's dramatically lower 25 W TDP while still delivering 16 cores.

Cache hierarchies follow different designs. The i9-14900KS allocates 80 KB of L1 per core, 2 MB of L2 per core, and 36 MB of shared L3. The Ultra 7 366H allocates 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3. The larger per-core L1 and L2 on the mobile part indicate a design optimized for lower power consumption while maintaining per-core responsiveness. The smaller shared L3 suggests a different thread-scheduling strategy, likely reflecting the Panther Lake architecture's reliance on a heterogeneous core arrangement.

The i9-14900KS's 24 cores and 32 threads rely on Hyper-Threading, which the data shows as the desktop chip having 32 threads from 24 cores. The Ultra 7 366H has 16 cores and 16 threads, indicating no Hyper-Threading support. This directly explains the massive multi-threaded performance gap in Cinebench R23, where the i9-14900KS scores 50,995 versus 28,477.

Memory architecture differs as well. The i9-14900KS supports both DDR4 and DDR5, giving desktop builders flexibility across existing and new platforms. The Ultra 7 366H supports DDR5 and LPDDR5X, aligning with mobile memory standards. The mobile chip's recorded memory bandwidth of 115.2 GB/s reflects the LPDDR5X integration, while the desktop chip has no such figure recorded.

The integrated graphics difference points to architectural evolution. UHD Graphics 770 on the i9-14900KS represents the older Raptor Lake graphics block. Intel Xe3 Graphics on the Ultra 7 366H reflects the newer Panther Lake GPU architecture, which likely contributes to the mobile chip's efficiency in mixed workloads.

The PCIe configurations differ in lane count: 16 lanes for the desktop part and 12 lanes for the mobile part. Both use Gen 5, but the desktop part offers more expansion headroom for discrete GPUs and storage devices. This aligns with the i9-14900KS's desktop positioning and the Ultra 7 366H's mobile constraints.

The release timeline shows a significant gap: the i9-14900KS launched on 2024-03-13, while the Ultra 7 366H launched on 2026-01-04. This nearly two-year gap explains the process node improvement from 10 nm to 3 nm. The newer Panther Lake design also brings the locked multiplier, whereas the older Raptor Lake part retains an unlocked multiplier for enthusiast overclocking.