AMD Ryzen AI Embedded P174i vs AMD Ryzen Embedded 8645HS Comparison

FAQ

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

A: The AMD Ryzen AI Embedded P174i uses 10 cores and 20 threads, while the AMD Ryzen Embedded 8645HS has 6 cores and 12 threads.

Q: Which processor has a higher base clock speed?

A: The AMD Ryzen Embedded 8645HS starts at 4.30 GHz, which is considerably higher than the 2.00 GHz base clock of the AMD Ryzen AI Embedded P174i.

Q: What is the thermal design power (TDP) difference between the two?

A: The AMD Ryzen AI Embedded P174i is rated at 28 W, whereas the AMD Ryzen Embedded 8645HS has a 45 W TDP.

Q: Do both processors use the same socket?

A: Yes, both the AMD Ryzen AI Embedded P174i and the AMD Ryzen Embedded 8645HS use the AMD Socket FP8.

Q: Which processor has a larger L1 cache per core?

A: The AMD Ryzen AI Embedded P174i has 80 KB of L1 cache per core, while the AMD Ryzen Embedded 8645HS has 64 KB per core.

Q: What integrated graphics are included in each chip?

A: The AMD Ryzen AI Embedded P174i features the Radeon 880M, while the AMD Ryzen Embedded 8645HS includes the Radeon 760M.

Where Each One Wins

The AMD Ryzen AI Embedded P174i clearly wins in scenarios that demand high parallel throughput. Its 10 cores and 20 threads give it a structural advantage over the 6-core, 12-thread AMD Ryzen Embedded 8645HS. Any workload that scales well across multiple cores, such as compilation, rendering, or heavy database operations, would favor the P174i based on core count alone. Additionally, the P174i has a larger L1 cache allocation per core (80 KB vs 64 KB), which can improve performance in latency-sensitive, per-thread operations.

The AMD Ryzen Embedded 8645HS wins in situations where responsiveness and raw single-thread speed matter more than core count. Its base clock of 4.30 GHz is more than double that of the P174i's 2.00 GHz, meaning that for lightly threaded tasks or workloads that cannot utilize all cores, the 8645HS will likely complete work faster. The 8645HS also provides more PCIe lanes: 20 lanes versus 16 lanes on the P174i. This makes the 8645HS a better fit for systems requiring more expansion capability, such as additional NVMe storage or multiple add-in cards.

The P174i is also the only one of the two that supports LPDDR5X memory in addition to DDR5. This could be a decisive factor in compact, power-sensitive embedded designs where low-power memory is required. The 8645HS only lists DDR5 support.

Both processors have identical boost clocks at 5.00 GHz, so peak single-core frequency is not a differentiator. Both also share the same memory bandwidth of 89.6 GB/s and dual-channel memory bus, so memory throughput is equal when using comparable memory types.

Architecture Differences

The two processors come from different architectural families. The AMD Ryzen AI Embedded P174i is based on the Gorgon Point codename and belongs to the Ryzen AI Embedded generation, which uses a hybrid design of Zen 5 and Zen 5c cores. The AMD Ryzen Embedded 8645HS uses the Hawk Point codename and is built on the Zen 4 architecture.

Both are fabricated on a 4 nm process at TSMC, so the underlying transistor technology is the same. However, the die sizes differ. The P174i has a die size of 233 mm², while the 8645HS is smaller at 178 mm². The 8645HS lists a transistor count of 25,000 million, while no transistor count is provided for the P174i.

The cache hierarchy shows similarities and differences. Both have 1 MB of L2 cache per core and 16 MB of L3 cache. The L1 cache differs: the P174i has 80 KB per core, the 8645HS has 64 KB per core. Neither processor supports 3D V-Cache.

The integrated graphics differ as well. The P174i uses the Radeon 880M, while the 8645HS uses the Radeon 760M. Based on naming conventions alone, the 880M is likely the newer or higher-tier GPU, though no benchmark data is available in the database to confirm relative performance.

Memory support diverges: the P174i supports both DDR5 and LPDDR5X, while the 8645HS supports only DDR5. Both support ECC memory, which is important for embedded reliability.

The PCIe configuration also differs. The P174i provides 16 lanes of Gen 4, while the 8645HS provides 20 lanes of Gen 4. Both are CPU-only lane counts.

Specification Differences

The recorded data shows several specification differences between the two processors.

• Cores: 10 (P174i) vs 6 (8645HS)
• Threads: 20 (P174i) vs 12 (8645HS)
• Base Clock: 2.00 GHz (P174i) vs 4.30 GHz (8645HS)
• Boost Clock: 5.00 GHz for both (no difference)
• TDP: 28 W (P174i) vs 45 W (8645HS)
• Codename: Gorgon Point (P174i) vs Hawk Point (8645HS)
• Architecture: Zen 5 / Zen 5c hybrid (P174i) vs Zen 4 (8645HS)
• Generation: Ryzen AI Embedded (P174i) vs Ryzen Embedded 8000 series (8645HS)
• Transistors: Not listed (P174i) vs 25,000 million (8645HS)
• Die Size: 233 mm² (P174i) vs 178 mm² (8645HS)
• L1 Cache: 80 KB per core (P174i) vs 64 KB per core (8645HS)
• L2 Cache: 1 MB per core for both (no difference)
• L3 Cache: 16 MB for both (no difference)
• Memory Support: DDR5, LPDDR5X (P174i) vs DDR5 only (8645HS)
• PCIe Lanes: 16 (P174i) vs 20 (8645HS)
• Integrated Graphics: Radeon 880M (P174i) vs Radeon 760M (8645HS)
• Release Date: 2026-02-28 (P174i) vs 2024-04-01 (8645HS)

Both processors share the same socket (FP8), memory bus width (dual-channel), memory bandwidth (89.6 GB/s), ECC support, process node (4 nm), foundry (TSMC), and unlocked multiplier status (both locked).

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark entries for these two processors. Both have an average benchmark score of 0 and both sit at the 50th percentile versus all CPUs. There are no nearest rivals listed for either part, and no wins are recorded for either side.

This absence of data makes a direct quantitative comparison impossible from measured performance figures. However, the specification differences provide a basis for inference.

The most significant performance-relevant difference is the core count. The P174i offers 10 cores versus 6 cores, which is a 66.7% increase in core count and an 66.7% increase in thread count (20 vs 12). For multi-threaded workloads that scale linearly, this would translate into a substantial advantage, assuming similar per-core performance. The P174i also has a larger L1 cache per core, which can reduce memory latency in per-thread loops.

The 8645HS counters with a base clock of 4.30 GHz versus 2.00 GHz. This is a 115% higher base frequency. For single-threaded or lightly threaded workloads, the 8645HS would likely outperform the P174i by a wide margin, unless the P174i's Zen 5 architecture provides a significant IPC advantage over Zen 4. No IPC data is present in the database to confirm such an advantage.

Both processors boost to 5.00 GHz, so peak frequency is identical. This means that in short bursts where boost is sustained, the per-core performance difference may be minimal, but the 8645HS can maintain higher clocks under sustained load due to its higher base frequency, subject to thermal and power constraints.

The TDP difference (28 W vs 45 W) suggests the 8645HS is designed for higher sustained power delivery, which supports its higher base clock. The P174i is optimized for lower power consumption, which aligns with its lower base clock and hybrid core design.

Memory bandwidth is identical at 89.6 GB/s, so memory-intensive workloads will not see a bandwidth difference between the two. The P174i's support for LPDDR5X could allow lower-power memory configurations, but bandwidth remains the same in the recorded data.

PCIe lane difference (16 vs 20) does not directly affect CPU compute benchmarks but impacts system-level I/O throughput. The 8645HS can support more Gen 4 devices simultaneously.

The Verdict

Based on the recorded data, the choice between these two processors depends entirely on the workload characteristics.

The AMD Ryzen AI Embedded P174i is the better choice for multi-threaded, parallel workloads. Its 10 cores and 20 threads provide a 66.7% core advantage over the 8645HS. The larger L1 cache per core and the modern Zen 5 / Zen 5c hybrid architecture support this positioning. The 28 W TDP also makes it more suitable for power-constrained embedded designs. The additional LPDDR5X memory support gives it flexibility in memory selection that the 8645HS lacks.

The AMD Ryzen Embedded 8645HS is the better choice for single-threaded performance and systems requiring more I/O expansion. Its 4.30 GHz base clock is 115% higher than the P174i's 2.00 GHz, which directly benefits latency-sensitive, serial workloads. The 45 W TDP indicates it can sustain higher power draw, which supports sustained high clock operation. The 20 PCIe Gen 4 lanes allow more peripherals to be connected directly to the CPU.

For embedded applications where workload diversity is expected, the 8645HS offers a more balanced profile: high base frequency for interactive tasks and adequate core count for moderate parallelism. The P174i is more specialized toward throughput-oriented compute, sacrificing base frequency for core count and power efficiency.

Neither processor has recorded benchmark scores in the database, so these conclusions are drawn strictly from the specification data. Both processors share the same boost clock, memory bandwidth, socket, process node, and ECC support, so those factors do not differentiate them. The release dates show the P174i is newer (2026-02-28) versus the 8645HS (2024-04-01), but age alone does not determine performance.

The data indicates that users needing maximum parallel compute should select the P174i, while users prioritizing fast response times and higher I/O capacity should select the 8645HS. The absence of benchmark measurements means actual performance ratios remain unverified, but the specification differences are clear and consistent across multiple fields.