AMD Ryzen Embedded 8645HS vs Intel Core Ultra 9 386H Comparison

Where Each One Wins

The recorded benchmark data splits cleanly by workload type. The AMD Ryzen Embedded 8645HS has no benchmark entries in the database, meaning every measured score belongs to the Intel Core Ultra 9 386H. For this reason, the Intel part claims all performance wins where measurements exist. The AMD processor, however, differentiates itself through its architectural feature set: it supports ECC memory, uses a 4 nm TSMC process, and offers 20 PCIe Gen 4 lanes from the CPU, whereas the Intel chip uses a 3 nm Intel process, lacks ECC support, and provides 12 PCIe Gen 5 lanes. The database places the Intel Core Ultra 9 386H at the 88th percentile among all CPUs, with an average benchmark score of 43210. The AMD Ryzen Embedded 8645HS sits at the 50th percentile with an average benchmark score of 0, reflecting the absence of recorded test data rather than a measured performance level. Workloads that demand high multi-threaded throughput, such as rendering, physics simulation, and data compression, fall to the Intel part by default. Single-thread responsiveness also belongs to the Intel chip, as its recorded Cinebench R23 single-core score of 2071.5 stands alone in the comparison. The AMD part holds advantages in areas not covered by the benchmark suite: ECC memory support, which matters for error-sensitive embedded workloads, and a higher base clock of 4.30 GHz against the Intel part's 2.10 GHz. The Intel chip counters with a larger shared L3 cache of 18 MB versus 16 MB, higher memory bandwidth at 115.2 GB/s versus 89.6 GB/s, and support for LPDDR5X in addition to DDR5, while the AMD part lists only DDR5.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen Embedded 8645HS boosts to 5.00 GHz, while the Intel Core Ultra 9 386H boosts to 4.90 GHz. The AMD part leads by 0.10 GHz in this metric.

Q: How do the core counts compare?

A: The Intel Core Ultra 9 386H has 16 cores and 16 threads, while the AMD Ryzen Embedded 8645HS has 6 cores and 12 threads. The Intel part provides 10 more cores but the AMD part offers simultaneous multi-threading, giving it 2 extra threads beyond its core count.

Q: Which processor supports ECC memory?

A: Only the AMD Ryzen Embedded 8645HS supports ECC memory. The Intel Core Ultra 9 386H does not list ECC support in its specifications.

Q: What memory types does each processor support?

A: The AMD Ryzen Embedded 8645HS supports DDR5 only. The Intel Core Ultra 9 386H supports both DDR5 and LPDDR5X.

Q: Which processor has the higher measured multi-core score?

A: The Intel Core Ultra 9 386H recorded a Cinebench R23 multi-core score of 20547. The AMD Ryzen Embedded 8645HS has no recorded benchmark scores in the database.

Q: How does the Intel part compare to its nearest rivals?

A: The Intel Core Ultra 9 386H scores 0.7% above the Intel Core i9-12900 and 0.9% above the Intel Core i9-12900KF. It trails the AMD Ryzen AI Max PRO 385 by 0.3% and the AMD Ryzen AI 9 465 by 0.5%.

Head-to-Head Benchmarks

No head-to-head benchmark entries exist for the AMD Ryzen Embedded 8645HS against the Intel Core Ultra 9 386H. The database contains 17 benchmark scores for the Intel part and zero for the AMD part. The Intel Core Ultra 9 386H achieves a Cinebench R23 multi-core score of 20547 and a single-core score of 2071.5. In Cinebench R20, the Intel chip records 12820 multi-core and 1809 single-core. The Cinebench R15 results stand at 3223 multi-core and 303.5 single-core.

PassMark results for the Intel part show a multithread score of 35399 and a single-thread score of 4218. The data compression test yields 352365, while data encryption reaches 27150. Extended instructions score 29138, find prime numbers scores 341, floating point math scores 108527, and integer math scores 87284. Physics simulation records 3028, and random string sorting records 42135. These scores establish the Intel part's position at the 88th percentile with an average benchmark score of 43210.

The nearest rival comparison for the Intel part includes four processors. The AMD Ryzen AI Max PRO 385 holds an average score of 43326, placing it 0.3% ahead of the Intel Core Ultra 9 386H. The AMD Ryzen AI 9 465 averages 43431, which is 0.5% ahead. The Intel Core i9-12900 averages 42906, putting it 0.7% behind the Intel Core Ultra 9 386H. The Intel Core i9-12900KF averages 42830, which is 0.9% behind. These deltas place the Intel Core Ultra 9 386H in a tight cluster with its nearest competitors, all within roughly one percentage point of each other. The AMD Ryzen Embedded 8645HS has no nearest rival entries and no average benchmark score, so no comparative statement can be made from measured data.

Specification Differences

The two processors diverge on nearly every core specification. The AMD Ryzen Embedded 8645HS uses 6 cores and 12 threads, while the Intel Core Ultra 9 386H uses 16 cores and 16 threads. Base clocks differ substantially: the AMD part runs at 4.30 GHz, the Intel part at 2.10 GHz. Boost clocks are closer, with the AMD part at 5.00 GHz and the Intel part at 4.90 GHz. Thermal design power favors the Intel part at 25 watts against the AMD part's 45 watts. The AMD chip uses AMD Socket FP8, while the Intel chip uses Intel BGA 2540.

Cache hierarchies differ in size and organization. The AMD part provides 64 KB of L1 per core, 1 MB of L2 per core, and 16 MB of shared L3. The Intel part provides 192 KB of L1 per core, 2.5 MB of L2 per core, and 18 MB of shared L3. The Intel part's larger per-core cache allocations reflect its Panther Lake architecture, while the AMD part's smaller per-core values reflect Zen 4's cache design.

Memory specifications also separate the two. The AMD part supports DDR5 with dual-channel configuration and 89.6 GB/s of memory bandwidth. The Intel part supports DDR5 and LPDDR5X with dual-channel configuration and 115.2 GB/s of memory bandwidth. ECC memory support appears only on the AMD part. PCIe connectivity differs by generation and lane count: the AMD part offers Gen 4 with 20 CPU lanes, while the Intel part offers Gen 5 with 12 CPU lanes. Integrated graphics differ as well, with the AMD part using Radeon 760M and the Intel part using Intel Xe3 Graphics.

The AMD Ryzen Embedded 8645HS was released on 2024-04-01, while the Intel Core Ultra 9 386H was released on 2026-01-04. The AMD part belongs to the 8000 series under the Ryzen Embedded branding, while the Intel part belongs to the Core Ultra Series 3 under the Ultra 9 branding. Neither processor has a recorded launch MSRP in the database, and neither has an unlocked multiplier.

Architecture Differences

The AMD Ryzen Embedded 8645HS uses the Zen 4 architecture under the Hawk Point codename, fabricated on a 4 nm process at TSMC. The die measures 178 mm² and contains 25,000 million transistors. The Intel Core Ultra 9 386H uses the Panther Lake architecture under the Panther Lake codename, fabricated on a 3 nm process at Intel. The Intel part has no recorded transistor count or die size in the database.

The generation labels reflect the architectural split. The AMD part is listed as Ryzen Embedded (Zen 4 (Hawk Point)), while the Intel part is listed as Ultra 9 (Panther Lake-H). The manufacturing differences are notable: TSMC produces the AMD chip at 4 nm, while Intel produces its own chip at 3 nm. The AMD part's 178 mm² die size with 25,000 million transistors gives a defined density figure, whereas the Intel part's physical dimensions remain unrecorded.

Feature differences follow the architectural split. The AMD part supports ECC memory, a capability absent from the Intel part. The Intel part supports LPDDR5X in addition to DDR5, widening its memory compatibility. PCIe generation favors the Intel part with Gen 5 support, while the AMD part remains at Gen 4 with more lanes. The AMD part's 20 CPU lanes exceed the Intel part's 12 CPU lanes, which may matter for embedded configurations requiring more direct I/O connectivity. The Intel part's higher memory bandwidth of 115.2 GB/s versus 89.6 GB/s aligns with its newer PCIe generation and broader memory support.

The Intel part's larger cache structure, with 192 KB of L1 per core and 2.5 MB of L2 per core, contrasts with the AMD part's 64 KB of L1 and 1 MB of L2 per core. Shared L3 also favors the Intel part at 18 MB versus 16 MB. The Intel part's 16 threads across 16 cores indicates no simultaneous multi-threading, while the AMD part's 12 threads from 6 cores indicates SMT is enabled. The AMD part's higher base clock of 4.30 GHz against the Intel part's 2.10 GHz suggests different frequency strategies, with the AMD design relying on higher sustained clocks and the Intel design relying on more physical cores at lower base frequency. The measured single-core performance for the Intel part, a Cinebench R23 score of 2071.5, provides the only direct frequency-independent performance data in the comparison.