Intel Core i9-12900KS vs Intel Core i9-13900HX Comparison

The Intel Core i9-13900HX and Intel Core i9-12900KS present a stark contrast in design philosophy and benchmark results. The desktop 12900KS wins the majority of head-to-head tests, 18 of 23, but the mobile 13900HX secures decisive victories in specific workloads that highlight its architectural advantages. The data shows a clear split: the 12900KS dominates in raw single-thread and sustained multi-thread rendering, while the 13900HX excels in integer math and prime number calculations.

Head-to-Head Benchmarks

The most significant margin in the entire comparison belongs to the 12900KS in Cinebench R23 single-core, where it scores 5203 against 2056, a 60.5% advantage for the desktop chip. This is not a minor gap; it is a generational difference in clock behavior and power delivery. Similarly, in Cinebench R15 single-core, the 12900KS scores 524 versus 296, a 43.5% lead. These results indicate that for lightly threaded tasks, the 12900KS is in a different class entirely.

In multi-core rendering, the 12900KS also takes the top spot in the most demanding test. Its Cinebench R23 multi-core score of 36859 dwarfs the 13900HX's 27900, a 24.3% difference. The 12900KS also wins Cinebench R20 multi-core, 15480 versus 14836, a 4.2% margin. However, the older Cinebench R15 multi-core test tells a different story: the 13900HX wins with 4494.5 against 3715, a 21% advantage. This reversal suggests the 13900HX's higher core count (24 versus 16) helps in specific workload scaling patterns, but the 12900KS's superior sustained power delivery wins longer or more modern render loops.

The 3DMark results uniformly favor the 12900KS. In the 16-thread test, it scores 10316 against 8929, a 13.4% lead. The 8-thread test shows a 12.9% gap (7872 versus 6857), and the 4-thread test shows a 7.1% gap (4320 versus 4012). Even in the max-thread test, the 12900KS wins, 11897 versus 11738, but by only 1.3%. The 2-thread and single-thread tests are close, with the 12900KS leading by 3.1% and 1.7% respectively. This pattern indicates that the 12900KS's higher boost clock of 5.50 GHz provides a consistent advantage across thread counts in these synthetic gaming and physics workloads.

PassMark results are more mixed. The 12900KS wins data compression, 563709 versus 531224, a 5.8% margin. It also wins extended instructions (35089 versus 30550, 12.9% ahead), floating point math (111429 versus 110470, 0.9% ahead), random string sorting (60539 versus 59199, 2.2% ahead), and the multithread test (43698 versus 43062, 1.5% ahead). The single-thread PassMark test also goes to the 12900KS, 4330 versus 4081, a 5.8% lead.

The 13900HX wins five tests, and its victories are substantial. In passmark_find_prime_numbers, it scores 190 versus 158, a 20.3% advantage. This is a pure integer workload that scales with core count and cache efficiency. In passmark_integer_math, it scores 156175 versus 147575, a 5.8% win. The 13900HX also wins passmark_physics, 2645 versus 2437, an 8.5% margin. Its data encryption score is 32130 versus 31403, a 2.3% win. These results show the 13900HX's 24 cores and 32 threads provide real benefits in parallel integer operations, even when the desktop chip has higher clocks.

The Verdict

The data supports a clear verdict for different users. The Intel Core i9-12900KS is the superior processor for anyone prioritizing single-thread performance and sustained multi-core rendering. Its 60.5% lead in Cinebench R23 single-core and 24.3% lead in Cinebench R23 multi-core are decisive. The 12900KS also wins 18 of 23 head-to-head matchups, making it the default choice for general productivity and gaming workloads.

The Intel Core i9-13900HX is the right pick for users who need maximum integer throughput and specific scientific or encryption workloads. Its 20.3% win in prime number finding and 5.8% win in integer math are meaningful for those exact tasks. The 13900HX also wins physics calculations by 8.5%, which could matter in simulation environments. However, its losses in every 3DMark test and most Cinebench tests make it a niche choice for specialized workloads rather than a general-purpose champion.

The average benchmark scores confirm the overall balance. The 13900HX has an average score of 46098, while the 12900KS scores 45094. The 13900HX is 0.1% ahead of the Intel Core Ultra 5 235 and 0.1% ahead of the AMD Ryzen AI 9 HX 375. The 12900KS is 0.5% ahead of the Intel Core i5-14600 and 1.2% ahead of the AMD Ryzen 5 7500X3D. Both chips sit at the 89th percentile of all CPUs, meaning they are elite performers, but the 13900HX achieves this in a mobile form factor.

FAQ

Q: Which processor has a higher boost clock?

A: The Intel Core i9-12900KS has a boost clock of 5.50 GHz, while the Intel Core i9-13900HX has a boost clock of 5.40 GHz.

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

A: The Intel Core i9-13900HX has 24 cores and 32 threads. The Intel Core i9-12900KS has 16 cores and 24 threads.

Q: What is the biggest single benchmark margin between the two?

A: The largest margin is in Cinebench R23 single-core, where the Intel Core i9-12900KS leads by 60.5% with a score of 5203 versus 2056.

Q: Does the mobile processor win any Cinebench multi-core tests?

A: Yes, the Intel Core i9-13900HX wins Cinebench R15 multi-core with a score of 4494.5, a 21% advantage over the Intel Core i9-12900KS's 3715.

Q: Which processor has a higher TDP?

A: The Intel Core i9-12900KS has a TDP of 150, while the Intel Core i9-13900HX has a TDP of 55.

Q: What is the L3 cache size for each?

A: The Intel Core i9-13900HX has 36 MB of shared L3 cache. The Intel Core i9-12900KS has 30 MB of shared L3 cache.

Specification Differences

The two processors differ in core count, clock speeds, power envelope, socket, and cache configuration. The 13900HX has 24 cores and 32 threads, while the 12900KS has 16 cores and 24 threads. The 12900KS has a higher base clock of 3.40 GHz versus 2.20 GHz, and a higher boost clock of 5.50 GHz versus 5.40 GHz. The TDP is dramatically different: 55 for the mobile 13900HX versus 150 for the desktop 12900KS. The 13900HX uses Intel BGA 1964, while the 12900KS uses Intel Socket 1700. The L2 cache differs as well, with the 13900HX having 2 MB per core and the 12900KS having 1.25 MB per core. The L3 cache is 36 MB shared for the 13900HX and 30 MB shared for the 12900KS. The 13900HX supports 20 PCIe Gen 5 lanes, while the 12900KS supports 16 PCIe Gen 5 lanes. The 12900KS has a recorded memory bandwidth of 76.8 GB/s, a figure not listed for the 13900HX. The die size is also different: 257 mm² for the 13900HX and 215 mm² for the 12900KS. The release dates are January 3, 2023 for the 13900HX and April 4, 2022 for the 12900KS.

Architecture Differences

Both processors are built on Intel's 10 nm process node and use the same foundry, Intel. The architecture differs: the 13900HX is Raptor Lake, specifically Raptor Lake-HX, while the 12900KS is Alder Lake, specifically Alder Lake-S. The 13900HX is a mobile part, while the 12900KS is a desktop part. The 13900HX has a larger die size at 257 mm² versus 215 mm² for the 12900KS. Both have 80 KB of L1 cache per core. The 13900HX has 2 MB of L2 cache per core, while the 12900KS has 1.25 MB per core. The 13900HX has 36 MB of shared L3 cache, the 12900KS has 30 MB. Both support DDR4 and DDR5 memory with dual-channel buses, and both support ECC memory. Both have integrated UHD Graphics 770. Both have unlocked multipliers. The 13900HX has more PCIe lanes, 20 versus 16, both Gen 5. The market segments are distinct: Mobile for the 13900HX and Desktop for the 12900KS.

Where Each One Wins

The Intel Core i9-12900KS wins in all gaming-related workloads. Every 3DMark test, from 2 threads to 16 threads and max threads, goes to the desktop chip. Its single-thread dominance, evidenced by a 60.5% lead in Cinebench R23 single-core and a 43.5% lead in Cinebench R15 single-core, makes it the clear choice for applications that depend on one or two fast cores. It also wins in modern multi-core rendering, with a 24.3% lead in Cinebench R23 multi-core and a 4.2% lead in Cinebench R20 multi-core. For data compression, extended instruction sets, floating point math, random string sorting, and general multithreaded PassMark tests, the 12900KS is ahead by margins ranging from 0.9% to 12.9%.

The Intel Core i9-13900HX wins in integer-heavy and encryption workloads. Its 20.3% lead in prime number finding and 5.8% lead in integer math show a clear advantage in tasks that scale with its 24 cores and 32 threads. It also wins physics calculations by 8.5% and data encryption by 2.3%. The 13900HX wins Cinebench R15 multi-core by 21%, which may indicate better performance in older or shorter render tasks. For users running scientific simulations, cryptographic workloads, or specific integer math benchmarks, the 13900HX is the better option. Its 36 MB of L3 cache versus 30 MB may contribute to these wins, as does its higher core count. The 13900HX achieves this in a 55 TDP package, while the 12900KS requires 150 TDP. The 12900KS remains the stronger all-around performer, but the 13900HX is the specialist for integer processing.