Intel Core i9-12900 vs Intel Core Ultra 9 386H Comparison

The Intel Core Ultra 9 386H and the Intel Core i9-12900 are both 16-core processors, yet they target entirely different platforms and deliver remarkably different performance profiles. The data shows the mobile Panther Lake chip wins 13 of 17 head-to-head benchmarks, but the desktop Alder Lake processor retains decisive victories in specific workloads. The Core Ultra 9 386H posts an average benchmark score of 43,210, placing it 0.7% ahead of the Core i9-12900’s 42,906, with both sitting at the 88th percentile among all CPUs. This is a generational showdown where the newer mobile part’s efficiency and single-thread speed challenge the older desktop part’s raw multi-threaded throughput and memory flexibility.

FAQ

Q: Which processor has the higher multi-core score in Cinebench R23?

A: The Intel Core Ultra 9 386H wins with a score of 20,547, which is 10.3% higher than the Intel Core i9-12900’s 18,628.

Q: How much faster is the Core Ultra 9 386H in single-threaded Passmark testing?

A: The Core Ultra 9 386H scores 4,218 versus the Core i9-12900’s 4,003, a 5.4% advantage in the passmark_single_thread test.

Q: What is the most significant performance gap between the two processors?

A: The largest delta is in PassMark’s find_prime_numbers test, where the Core Ultra 9 386H scores 341 against the Core i9-12900’s 121, a massive 181.8% difference.

Q: Does the Core i9-12900 win any benchmark by a wide margin?

A: Yes, it wins PassMark’s integer_math test with 127,512 versus 87,284, which is a 31.5% advantage for the desktop chip.

Q: Which processor supports ECC memory?

A: The Intel Core i9-12900 supports ECC memory, while the Intel Core Ultra 9 386H does not.

Q: What are the release dates for these two CPUs?

A: The Core i9-12900 was released on 2022-01-03, while the Core Ultra 9 386H is newer, with a release date of 2026-01-04.

Architecture Differences

The two processors represent distinct architectural eras for Intel. The Core Ultra 9 386H is built on the Panther Lake architecture using a 3 nm process node, while the Core i9-12900 uses the older Alder Lake architecture on a 10 nm node. This process advantage is fundamental: the mobile chip delivers competitive performance at a 25 W TDP, whereas the desktop chip requires a 65 W TDP to operate. The Core Ultra 9 386H features a smaller die with no published size, while the Core i9-12900 has a die size of 215 mm².

Cache configurations differ significantly. The Core Ultra 9 386H has 192 KB of L1 cache per core and 2.5 MB of L2 per core, with 18 MB of shared L3 cache. The Core i9-12900 has smaller per-core caches — 80 KB L1 and 1.25 MB L2 — but compensates with a larger 30 MB shared L3 cache. This means the desktop chip holds more total data in its last-level cache, which matters for certain repetitive workloads.

Memory support also diverges. The Core Ultra 9 386H supports DDR5 and LPDDR5X with a dual-channel memory bus and a memory bandwidth of 115.2 GB/s. The Core i9-12900 supports both DDR4 and DDR5, also dual-channel, but its memory bandwidth is capped at 76.8 GB/s. The mobile chip’s higher bandwidth is notable, though the desktop chip’s DDR4 compatibility offers broader platform flexibility.

Other architectural differences include the integrated graphics — Intel Xe3 Graphics on the Ultra 9 386H versus UHD Graphics 770 on the i9-12900 — and PCIe lanes. The mobile chip provides Gen 5 with 12 CPU lanes, while the desktop chip offers Gen 5 with 16 CPU lanes. The Core i9-12900 has an unlocked multiplier, enabling overclocking, whereas the Core Ultra 9 386H is locked. Finally, the mobile chip uses the Intel BGA 2540 socket, while the desktop chip uses Intel Socket 1700.

Where Each One Wins

The benchmark data reveals a clear split. The Intel Core Ultra 9 386H dominates in single-threaded performance and modern compute tasks. It wins all three Cinebench single-core tests (R15, R20, R23) with deltas ranging from 6.9% to 15.8%. It also leads in PassMark’s floating-point math (18.6% ahead), extended instructions (17.6% ahead), data encryption (17% ahead), and physics (75% ahead). The mobile chip’s 181.8% advantage in prime number finding suggests a vastly superior integer throughput per core or an optimized instruction pipeline.

The Intel Core i9-12900 retains victories in four specific areas. It wins data compression by 13.6%, integer math by 31.5%, random string sorting by 4.4%, and the Cinebench R15 multi-core test by 2.3%. These wins point to workloads that benefit from the desktop chip’s larger 30 MB L3 cache and higher 5.10 GHz boost clock. The data compression and string sorting tasks likely exploit the bigger cache pool, while integer math may leverage the higher thread count of 24 versus 16.

For general multi-threaded productivity, the Core Ultra 9 386H is the stronger choice. It wins Cinebench R20 multi-core by 6.9%, Cinebench R23 multi-core by 10.3%, and PassMark’s multithread test by 5.3%. This is notable because the desktop chip has 24 threads versus the mobile chip’s 16, yet the newer architecture still pulls ahead in most multi-threaded benchmarks.

Specification Differences

| Specification | Intel Core Ultra 9 386H | Intel Core i9-12900 |

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

| Series | Core Ultra Series 3 | Core 12th Gen |

| Cores | 16 | 16 |

| Threads | 16 | 24 |

| Base Clock | 2.10 GHz | 2.40 GHz |

| Boost Clock | 4.90 GHz | 5.10 GHz |

| TDP | 25 W | 65 W |

| Socket | Intel BGA 2540 | Intel Socket 1700 |

| Architecture | Panther Lake | Alder Lake |

| Process Node | 3 nm | 10 nm |

| L1 Cache | 192 KB (per core) | 80 KB (per core) |

| L2 Cache | 2.5 MB (per core) | 1.25 MB (per core) |

| L3 Cache | 18 MB (shared) | 30 MB (shared) |

| Memory Support | DDR5, LPDDR5X | DDR4, DDR5 |

| Memory Bandwidth | 115.2 GB/s | 76.8 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 5, 12 Lanes | Gen 5, 16 Lanes |

| Integrated Graphics | Intel Xe3 Graphics | UHD Graphics 770 |

| Market Segment | Mobile | Desktop |

| Release Date | 2026-01-04 | 2022-01-03 |

| Multiplier Unlocked | No | Yes |

| Die Size | Not listed | 215 mm² |

Head-to-Head Benchmarks

The most striking result is in PassMark’s find_prime_numbers test, where the Core Ultra 9 386H scores 341 versus the Core i9-12900’s 121. This 181.8% delta is the largest of any benchmark and indicates a fundamental architectural advantage in this specific workload. The mobile chip also shows a 75% lead in PassMark’s physics test (3,028 vs. 1,730) and an 18.6% lead in floating-point math (108,527 vs. 91,514).

In Cinebench, the pattern is consistent. The Core Ultra 9 386H wins R15 single-core by 15.8% (303.5 vs. 262), R20 single-core by 6.9% (1,809 vs. 1,693), and R23 single-core by 13.5% (2,071.5 vs. 1,825). Multi-core results are closer but still favor the mobile chip: R20 multi-core is 6.9% higher (12,820 vs. 11,994) and R23 multi-core is 10.3% higher (20,547 vs. 18,628). Only in R15 multi-core does the desktop chip win, scoring 3,299 versus 3,223, a 2.3% margin.

The desktop chip’s best showing is in PassMark’s integer_math test, where it scores 127,512 against 87,284 — a 31.5% advantage. It also wins data compression (407,899 vs. 352,365, up 13.6%) and random string sorting (44,070 vs. 42,135, up 4.4%). These results suggest the Core i9-12900’s 30 MB L3 cache and higher 5.10 GHz boost clock provide real benefits for memory-intensive and integer-heavy tasks.

Encryption and extended instructions favor the mobile chip. The Core Ultra 9 386H scores 27,150 in data encryption versus 23,203 (17% higher) and 29,138 in extended instructions versus 24,777 (17.6% higher). PassMark multithread also goes to the mobile chip: 35,399 versus 33,608, a 5.3% win. Finally, single-thread performance is consistently better on the Core Ultra 9 386H, with 4,218 versus 4,003 in both PassMark single-thread tests, a 5.4% margin.

The Verdict

The data points to a clear winner for most users: the Intel Core Ultra 9 386H. It wins 13 of 17 head-to-head benchmarks and carries a higher average score (43,210 vs. 42,906). Its single-thread dominance is decisive — every single-core benchmark goes to the mobile chip, with Cinebench R15 showing a 15.8% lead. For anyone prioritizing modern productivity, encryption, floating-point math, or physics simulation, the Core Ultra 9 386H is the superior choice despite running at a fraction of the TDP (25 W vs. 65 W).

The Intel Core i9-12900 remains relevant for specific use cases. Its 31.5% victory in integer math and 13.6% win in data compression indicate that workloads heavily reliant on large caches and raw integer throughput still favor the desktop part. The 24 threads versus 16 also help in legacy multi-threaded scenarios, as shown by its narrow 2.3% win in Cinebench R15 multi-core. Users running compression tools, string-sorting algorithms, or integer-heavy code on a desktop platform with DDR4 support and ECC memory will find the Core i9-12900 compelling.

The verdict depends on platform and workload. For mobile users or those building compact systems, the Core Ultra 9 386H offers better performance per watt, a newer 3 nm process, and higher memory bandwidth (115.2 GB/s vs. 76.8 GB/s). For desktop builders with overclocking needs, ECC memory requirements, or workloads that exploit the 30 MB L3 cache, the Core i9-12900 remains a viable option. The average benchmark scores are nearly identical — a 0.7% gap — but the distribution of wins makes the Core Ultra 9 386H the more versatile processor overall.