AMD Ryzen AI Embedded P185i vs AMD Ryzen Embedded 8645HS Comparison

FAQ

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

A: The AMD Ryzen AI Embedded P185i has 12 cores and 24 threads. The AMD Ryzen Embedded 8645HS has 6 cores and 12 threads.

Q: What is the boost clock speed for each chip?

A: The P185i boosts up to 5.10 GHz, while the 8645HS boosts up to 5.00 GHz.

Q: Which processor has a higher base clock?

A: The 8645HS has a base clock of 4.30 GHz, which is significantly higher than the P185i's base clock of 2.00 GHz.

Q: Do both processors support ECC memory?

A: Yes, both the P185i and the 8645HS support ECC memory.

Q: What is the process node for both chips?

A: Both processors are built on a 4 nm process at TSMC.

Q: What integrated graphics do they use?

A: The P185i integrates a Radeon 890M, while the 8645HS integrates a Radeon 760M.

Architecture Differences

The two processors, while both from AMD and using the same Socket FP8, represent distinct architectural generations. The P185i is codenamed Gorgon Point and belongs to the Ryzen AI Embedded generation, which uses a hybrid core arrangement of Zen 5 and Zen 5c cores. The 8645HS is codenamed Hawk Point, part of the 8000 series, and uses a homogeneous Zen 4 architecture.

This architectural split explains several key specification differences. The P185i features 12 cores and 24 threads, doubling the thread count of the 8645HS. However, the 8645HS has a substantially higher base clock at 4.30 GHz versus 2.00 GHz on the P185i. The boost clocks are closer, with the P185i reaching 5.10 GHz and the 8645HS reaching 5.00 GHz.

Cache layouts also differ. The P185i provides 80 KB of L1 cache per core and 1 MB of L2 cache per core, with 16 MB of L3 cache. The 8645HS offers 64 KB of L1 cache per core, 1 MB of L2 cache per core, and 16 MB of shared L3 cache. Both have the same total L3 capacity, but the per-core L1 differences reflect the different core designs.

The die size tells a story of complexity: the P185i measures 233 mm², while the 8645HS is smaller at 178 mm². The 8645HS has a listed transistor count of 25,000 million, while the P185i has no transistor figure in the data. Both are manufactured on TSMC's 4 nm process.

Memory support differs as well. The P185i supports both DDR5 and LPDDR5X, while the 8645HS supports only DDR5. Both use dual-channel memory buses with identical 89.6 GB/s bandwidth. PCIe lane counts also differ: the P185i provides 16 CPU lanes of Gen 4 PCIe, while the 8645HS provides 20 lanes of Gen 4 PCIe.

The integrated graphics solutions are different tiers. The P185i uses a Radeon 890M, while the 8645HS uses a Radeon 760M. Both chips are classified as mobile market segment products and remain in active production. The P185i has a release date in 2026, while the 8645HS was released in 2024.

Head-to-Head Benchmarks

The recorded benchmark data for these two processors shows no direct head-to-head comparisons, as the head-to-head benchmark array is empty. Similarly, neither processor has individual benchmark scores or rival comparison data in the database. The average benchmark score for both is 0, and both sit at the 50th percentile among all CPUs in the database.

Without direct measurement data, the analysis must rely entirely on the specification differences to infer relative performance. The P185i's core advantage is clear: it offers double the cores and threads of the 8645HS. In heavily threaded workloads, this should translate to a substantial throughput advantage. The P185i's 12 cores and 24 threads, combined with its Zen 5 and Zen 5c hybrid architecture, position it for parallel processing tasks.

The 8645HS counters with a much higher base clock of 4.30 GHz, which is more than double the P185i's 2.00 GHz base clock. This gives the 8645HS a potential advantage in lightly threaded, latency-sensitive workloads where clock speed dominates. Its boost clock of 5.00 GHz is close to the P185i's 5.10 GHz, so the gap narrows under boost conditions.

The TDP figures are notable. The 8645HS has a TDP of 45, while the P185i has a TDP of 28. This is a significant difference in power envelope. The 8645HS can sustain higher clocks within its larger power budget, while the P185i operates more efficiently. The lower TDP of the P185i suggests it may be better suited for thermally constrained environments, even with more cores.

The integrated graphics difference is also relevant. The Radeon 890M in the P185i is a higher-tier solution than the Radeon 760M in the 8645HS. For workloads that leverage the iGPU, the P185i should deliver stronger graphics performance. The 8645HS's higher power envelope could allow it to sustain CPU clocks better under sustained loads, but the P185i's efficiency and core count are compensating factors.

Given the lack of benchmark scores, a definitive performance ranking cannot be established from measured data. The specification sheet suggests the P185i is built for throughput and efficiency, while the 8645HS is built for raw clock speed and responsiveness in a smaller core footprint.

Specification Differences

The two processors differ across multiple specification fields. The most obvious difference is core count: the P185i has 12 cores and 24 threads, while the 8645HS has 6 cores and 12 threads. This is a 2x difference in both cores and threads.

Base clock speeds are dramatically different. The P185i runs at 2.00 GHz, while the 8645HS runs at 4.30 GHz. Boost clocks are closer, with the P185i at 5.10 GHz and the 8645HS at 5.00 GHz. The P185i holds a 0.10 GHz advantage in boost.

TDP is a major differentiator. The P185i is rated at 28, while the 8645HS is rated at 45. This represents a 17-watt difference in thermal design power. Both use the same Socket FP8.

The codenames and generations differ: Gorgon Point with Zen 5 / Zen 5c hybrid architecture versus Hawk Point with Zen 4. The P185i has a die size of 233 mm², while the 8645HS is 178 mm². The 8645HS lists 25,000 million transistors; the P185i has no transistor count in the data.

Cache structures differ in L1 and L2 organization. The P185i uses 80 KB of L1 per core and 1 MB of L2 per core. The 8645HS uses 64 KB of L1 per core and 1 MB of L2 per core. Both have 16 MB of L3, but the 8645HS specifies it as shared while the P185i does not specify sharing.

Memory support is different: the P185i supports DDR5 and LPDDR5X, while the 8645HS supports only DDR5. Both use dual-channel memory with 89.6 GB/s bandwidth. PCIe lane counts differ: 16 lanes for the P185i versus 20 lanes for the 8645HS, both Gen 4.

Integrated graphics are different: Radeon 890M for the P185i versus Radeon 760M for the 8645HS. Release dates also differ: 2026 for the P185i and 2024 for the 8645HS.

The Verdict

The data indicates two processors with different design priorities. The AMD Ryzen AI Embedded P185i is configured for high core count, hybrid architecture, and a lower power envelope. The AMD Ryzen Embedded 8645HS is configured for high base clock speed, a larger power budget, and a more conventional core design.

For workloads that scale with thread count, the P185i is the clear choice on paper. Its 24 threads versus 12 threads is a structural advantage that clock speed alone cannot overcome in parallel tasks. The Zen 5 and Zen 5c hybrid arrangement, along with the larger die and newer release date, suggest a more modern design intended for throughput-oriented embedded applications.

For workloads that are latency-sensitive or lightly threaded, the 8645HS appears better suited. Its 4.30 GHz base clock is more than double the P185i's 2.00 GHz base clock, which should provide faster response in single-threaded operations. The higher 45 TDP allows sustained clock operation without the thermal constraints of the 28 TDP P185i.

The integrated graphics comparison favors the P185i with its Radeon 890M versus the Radeon 760M. For embedded applications that require GPU acceleration without a discrete card, the P185i has the stronger integrated solution.

The lack of benchmark data means these conclusions are drawn strictly from specification analysis. The database shows no measured performance scores for either chip, so any performance ranking is inferred from the recorded specifications.

Where Each One Wins

AMD Ryzen AI Embedded P185i wins in:

• Multi-threaded workloads: 12 cores and 24 threads double the 8645HS's capability.
• Efficiency-conscious deployments: the 28 TDP is significantly lower than the 45 TDP of the 8645HS.
• Integrated graphics performance: the Radeon 890M is a higher-tier iGPU than the Radeon 760M.
• Memory flexibility: supports both DDR5 and LPDDR5X, while the 8645HS only supports DDR5.
• Boost clock ceiling: 5.10 GHz slightly exceeds the 5.00 GHz of the 8645HS.

AMD Ryzen Embedded 8645HS wins in:

• Base clock speed: 4.30 GHz is far higher than the 2.00 GHz of the P185i.
• PCIe expansion: 20 Gen 4 lanes versus 16 Gen 4 lanes on the P185i.
• Thermal headroom for sustained clocks: the 45 TDP allows higher sustained power draw.
• Die efficiency: a smaller 178 mm² die with a known transistor count of 25,000 million.
• Earlier availability: released in 2024 versus 2026 for the P185i.

The benchmark database does not contain direct comparisons between these two processors, so the wins above are derived from specification analysis rather than measured performance deltas. Each chip has a distinct role: the P185i is positioned for parallel processing and lower power draw, while the 8645HS is positioned for high-frequency responsiveness and more PCIe connectivity. The choice between them depends entirely on which set of specifications matches the target workload.