AMD Ryzen AI Embedded P185 vs AMD Ryzen Embedded 8645HS Comparison

Head-to-Head Benchmarks

The AMD Ryzen AI Embedded P185 delivers a commanding performance profile across the recorded PassMark benchmark suite, while the AMD Ryzen Embedded 8645HS has no recorded benchmark scores in the database, making a direct numerical comparison impossible for most tests. The P185 posts a single-thread score of 3977, a multithread score of 31817, and an average benchmark score of 62839, placing it in the 93rd percentile of all CPUs tracked. The 8645HS, by contrast, holds a 50th percentile position with an average benchmark score of zero, indicating that its performance data has not yet been captured.

The P185 shows strong results in specialized workloads. Its integer math score reaches 117832, floating point math hits 70587, and extended instructions score 26544. Data compression completes at 374429, while data encryption finishes at 19612. Random string sorting records 40557, and find prime numbers returns 129. Physics simulation scores 1772. These figures establish a baseline for the P185, but without corresponding 8645HS numbers, the head-to-head comparison relies on architectural and positional data rather than direct test deltas.

The nearest rivals for the P185 provide context. Intel Core Ultra 7 255HX averages 62738, which is 0.2% behind the P185. Intel Core i7-13790F averages 63080, 0.4% ahead. Intel Core Ultra 7 265HX averages 63173, 0.5% ahead. AMD Ryzen AI 9 PRO 465 averages 62498, 0.5% behind. These margins are narrow, showing the P185 sits in a tightly contested performance band. The 8645HS has no nearest rivals listed, so its competitive position remains undefined by the database.

The percentile gap is stark. The P185 at 93 means it outperforms 93% of all CPUs in the database, while the 8645HS at 50 sits exactly at the median. This positional difference suggests the P185 is a high-end mobile part, whereas the 8645HS is a mid-range embedded processor. The average benchmark score of 62839 for the P185 versus zero for the 8645HS further reinforces that the P185 has measurable performance data, while the 8645HS lacks any recorded results.

Architecture Differences

The two processors share a manufacturer, socket, process node, and foundry, but diverge significantly in core configuration and design generation. Both use AMD Socket FP8 and are built on TSMC's 4 nm process. The P185 comes from the Gorgon Point codename and belongs to the Ryzen AI Embedded generation based on Zen 5 and Zen 5c cores. The 8645HS uses the Hawk Point codename and the older Zen 4 architecture, part of the 8000 series Ryzen Embedded lineup.

Core counts differ sharply. The P185 offers 12 cores and 24 threads, while the 8645HS provides 6 cores and 12 threads. This doubling of cores and threads gives the P185 a structural advantage in parallel workloads, assuming the Zen 5 and Zen 5c cores scale effectively. The P185 base clock is 2.00 GHz with a boost clock of 5.10 GHz, while the 8645HS starts higher at 4.30 GHz base and boosts to 5.00 GHz. The 8645HS has a higher base clock, which can favor lightly threaded tasks that do not trigger boost states, but the P185 has a 0.10 GHz higher boost ceiling.

Cache hierarchies differ in L1 and L2 allocation. The P185 provides 80 KB of L1 per core and 1 MB of L2 per core, totaling 12 MB of L2 across 12 cores. The 8645HS offers 64 KB of L1 per core and 1 MB of L2 per core, totaling 6 MB of L2 across 6 cores. Both share 16 MB of L3, though the P185 lists it without the "shared" qualifier while the 8645HS explicitly marks it as shared. The P185 die size is 233 mm², larger than the 8645HS at 178 mm². The 8645HS has a stated transistor count of 25,000 million, while the P185 does not list one.

Memory support shows differences. The P185 supports both DDR5 and LPDDR5X, while the 8645HS supports only DDR5. Both use dual-channel memory buses with identical 89.6 GB/s bandwidth. Both support ECC memory, which is critical for embedded and reliability-focused deployments. PCIe lane counts differ: the P185 provides Gen 4 with 16 lanes from the CPU, while the 8645HS provides Gen 4 with 20 lanes. Integrated graphics differ as well, with the P185 featuring the Radeon 890M and the 8645HS using the Radeon 760M.

Power envelopes contrast notably. The P185 has a TDP of 28 watts, while the 8645HS is rated at 45 watts. The lower TDP of the P185, combined with its higher core count and newer architecture, suggests a more power-efficient design. The 8645HS consumes more power but starts with a higher base clock, which may reflect a different design priority favoring sustained frequency over efficiency. The P185 also has a later release date, recorded as February 28, 2026, versus April 1, 2024 for the 8645HS. Both parts are marked as active in production, and neither has a multiplier unlocked.

Where Each One Wins

The P185 wins decisively in raw multithreaded capability based on its core and thread count. With 12 cores and 24 threads versus 6 cores and 12 threads, the P185 has double the parallel execution resources. The recorded multithread score of 31817 and the 93rd percentile ranking confirm that the P185 is built for heavy parallel workloads such as compilation, rendering, scientific simulation, and server-side processing. The 16 MB of L3 cache shared across more cores, plus larger per-core L1 and L2 caches, supports data-intensive multithreaded tasks.

The P185 also wins on efficiency. Its 28-watt TDP is substantially lower than the 8645HS's 45-watt rating, yet it delivers a higher boost clock and more cores. For embedded systems where thermal budgets are constrained, the P185 offers more compute per watt. The support for LPDDR5X memory adds flexibility for low-power memory configurations that the 8645HS cannot use. The newer Zen 5 and Zen 5c architecture also positions the P185 for better instructions-per-clock efficiency compared to the older Zen 4 design.

The 8645HS wins on base clock frequency. At 4.30 GHz, its base clock is more than double the P185's 2.00 GHz base. For tasks that run at base clocks without boosting, the 8645HS can sustain higher frequency. This could benefit certain real-time embedded workloads or scenarios where boost behavior is disabled for stability. The 8645HS also provides more PCIe lanes at 20 versus 16, which matters for systems needing additional Gen 4 connectivity for peripherals, storage controllers, or network interfaces.

The 8645HS has a smaller die at 178 mm² versus 233 mm², which can simplify manufacturing and potentially improve yield characteristics. Its transistor count of 25,000 million is explicitly documented, whereas the P185 lacks this data point. The 8645HS also has a longer market presence, releasing in April 2024 versus February 2026, meaning it has had more time for ecosystem validation and embedded design-in cycles. For systems already qualified on Zen 4, the 8645HS represents a lower-risk path.

The single-thread performance of the P185, recorded at 3977, indicates strong per-core capability despite the lower base clock. The 8645HS has no recorded single-thread score, so a direct comparison is unavailable. The P185's boost clock of 5.10 GHz, which is higher than the 8645HS's 5.00 GHz, suggests the P185 can reach higher peak frequencies when thermal and power conditions permit. The Radeon 890M integrated graphics in the P185 are also a higher-tier part than the Radeon 760M in the 8645HS, though no benchmark scores exist for either GPU.

FAQ

Q: What is the core count difference between the two processors?

A: The AMD Ryzen AI Embedded P185 has 12 cores and 24 threads, while the AMD Ryzen Embedded 8645HS has 6 cores and 12 threads. This gives the P185 double the parallel execution resources.

Q: Which processor has a higher boost clock?

A: The P185 boosts to 5.10 GHz, which is 0.10 GHz higher than the 8645HS's 5.00 GHz boost clock. However, the 8645HS has a much higher base clock at 4.30 GHz versus 2.00 GHz for the P185.

Q: Do both processors support ECC memory?

A: Yes, both the P185 and the 8645HS support ECC memory. Both also use dual-channel memory buses with 89.6 GB/s bandwidth, though the P185 additionally supports LPDDR5X while the 8645HS supports only DDR5.

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

A: The P185 has a TDP of 28 watts, while the 8645HS has a TDP of 45 watts. The P185 consumes less power while offering more cores and a higher boost clock.

Q: How do their benchmark percentiles compare?

A: The P185 sits in the 93rd percentile of all CPUs with an average benchmark score of 62839. The 8645HS sits in the 50th percentile with an average benchmark score of zero, as it has no recorded benchmark results in the database.

Q: Which processor uses a newer architecture?

A: The P185 uses Zen 5 and Zen 5c cores under the Gorgon Point codename, while the 8645HS uses Zen 4 under the Hawk Point codename. Both are built on TSMC's 4 nm process and use AMD Socket FP8.

The Verdict

The recorded data shows the AMD Ryzen AI Embedded P185 as the clear performance leader. Its 93rd percentile ranking, average benchmark score of 62839, and comprehensive PassMark results across single-thread, multithread, integer, floating point, encryption, compression, sorting, and physics tests establish a strong performance profile. The 12-core, 24-thread configuration with Zen 5 and Zen 5c architecture provides double the core count of the 8645HS, and the 28-watt TDP makes it the more efficient choice. The P185 also supports LPDDR5X memory, which the 8645HS cannot use, and features a higher-tier Radeon 890M integrated GPU.

The AMD Ryzen Embedded 8645HS, lacking any recorded benchmark scores, cannot be positioned on raw performance from the database. Its strengths lie in its higher base clock of 4.30 GHz, which may benefit workloads that operate at sustained base frequencies, and its 20 PCIe Gen 4 lanes versus 16 for the P185. The 45-watt TDP and older Zen 4 architecture suggest it targets a different segment, potentially prioritizing stability and validated design over maximum throughput. Its smaller die at 178 mm² and explicitly documented transistor count of 25,000 million provide some manufacturing transparency.

For systems that need maximum compute density, parallel throughput, and energy efficiency, the P185 is the data-backed choice. Its percentile position and benchmark scores indicate it competes closely with top Intel mobile parts, including the Core Ultra 7 255HX, Core Ultra 7 265HX, and Core i7-13790F, all within 0.5% of its average score. The 8645HS, by contrast, has no competitive data to draw upon, so any selection in its favor must rely on factors outside the recorded benchmarks, such as base clock frequency or PCIe lane count.

The verdict from the database is straightforward: the P185 is the higher-performing, more efficient, and more feature-rich processor. The 8645HS remains a viable option only where its specific characteristics, such as higher base clock or additional PCIe lanes, align with system requirements that do not depend on measured benchmark performance. For any workload where multithreaded throughput, single-thread speed, or power efficiency matters, the P185's recorded results make it the superior choice.