AMD Ryzen AI Embedded P174 vs AMD Ryzen Embedded 8645HS Comparison

Where Each One Wins

The recorded data shows a clean split between these two AMD embedded processors, though the benchmark set contains no head-to-head scores to quantify the margin. The AMD Ryzen AI Embedded P174 holds a structural advantage in core count, with 10 cores and 20 threads versus the AMD Ryzen Embedded 8645HS at 6 cores and 12 threads. That difference points to workloads with heavy parallel threading, such as virtualized embedded systems, multi-container edge deployments, or software-defined infrastructure where thread availability translates directly into throughput.

The AMD Ryzen Embedded 8645HS counters with a much higher base clock, 4.30 GHz versus 2.00 GHz on the P174. Both parts share the same 5.00 GHz boost clock, so the 8645HS will tend to hold higher frequencies under sustained single-thread or lightly threaded loads. For latency-sensitive tasks, real-time control loops, or legacy single-threaded applications, the 8645HS should deliver more responsive per-core performance despite its lower core count.

The memory support also separates them. The P174 accepts both DDR5 and LPDDR5X, while the 8645HS accepts DDR5 only. Embedded designs that prioritize low-power operation and compact board layouts may favor the P174 for its LPDDR5X option. The 8645HS brings 20 PCIe Gen 4 lanes (CPU only) versus 16 on the P174, giving the 8645HS more headroom for additional NVMe storage, accelerators, or high-speed I/O cards.

Integrated graphics differ as well: the P174 carries the Radeon 880M, while the 8645HS uses the Radeon 760M. The 880M sits higher in AMD's integrated graphics lineup, so the P174 likely delivers stronger display output, video encode/decode, or GPU compute for embedded edge devices that need visual processing. The 8645HS still provides capable graphics, but the P174 appears positioned for more graphics-heavy embedded workloads.

The 8645HS carries a 45 W TDP, while the P174 draws 28 W. That lower power envelope on the P174 makes it the better fit for fanless enclosures, battery-backed industrial systems, or thermal-constrained designs. The 8645HS trades more power for higher base frequencies, which suits actively cooled systems where sustained clock speed matters more than efficiency.

Architecture Differences

The two processors come from different architectural generations despite sharing the same 4 nm TSMC process node and AMD Socket FP8. The P174 uses the Gorgon Point codename and belongs to the Ryzen AI Embedded generation built on Zen 5 / Zen 5c cores. The 8645HS uses the Hawk Point codename and belongs to the 8000 series, built on Zen 4.

That generational gap shows in the cache hierarchy. The P174 allocates 80 KB of L1 cache per core, while the 8645HS allocates 64 KB per core. L2 remains identical at 1 MB per core for both. L3 totals match at 16 MB, though the 8645HS reports it as shared across all cores. The P174's larger L1 per core gives it more local data buffering, which can reduce memory traffic in tight loops.

Die size differs notably: the P174 measures 233 mm² versus 178 mm² for the 8645HS. The larger die on the P174 likely reflects the extra cores and the integrated Radeon 880M GPU. The 8645HS packs 25,000 million transistors into its smaller die, a figure not listed for the P174 in the database.

Both parts support ECC memory, which matters for embedded reliability requirements. Both use dual-channel memory buses with 89.6 GB/s bandwidth. The P174's memory controller additionally supports LPDDR5X, a low-power memory type absent from the 8645HS specification.

The P174's Zen 5 architecture brings a different core design philosophy compared to Zen 4 on the 8645HS. Zen 5 typically improves instruction-level parallelism and branch prediction, which can lift single-thread performance even at similar clock speeds. The 8645HS compensates with a 4.30 GHz base clock that exceeds the P174's 2.00 GHz base by a wide margin, so lightly threaded workloads may still favor the older part.

Both processors target mobile and embedded segments, both remain in active production, and neither offers an unlocked multiplier. The P174 released later, with a recorded launch date in 2026, while the 8645HS dates to 2024. That two-year gap likely explains the newer core design and the higher-tier integrated GPU on the P174.

Head-to-Head Benchmarks

The database lists no head-to-head benchmark entries for this pair, and neither processor has individual benchmark scores recorded. The wins count sits at zero for both sides. Without measured performance data, the analysis must rely on the specification differences that the database does contain.

The clearest quantitative gap is core count: the P174 offers 10 cores and 20 threads, which is 4 cores and 8 threads more than the 8645HS. That represents a 66.7% advantage in core count and a 66.7% advantage in thread count. For parallel workloads that scale with core availability, the P174 should sustain significantly higher aggregate throughput.

The base clock difference runs in the opposite direction. The 8645HS starts at 4.30 GHz, which is 2.30 GHz higher than the P174's 2.00 GHz base. That is a 115% higher base frequency. Under all-core sustained loads, the 8645HS will likely hold higher clock speeds, partially offsetting its core deficit.

Both parts reach the same 5.00 GHz boost clock, so peak single-thread speed appears identical on paper. However, the Zen 5 architecture on the P174 may extract more instructions per cycle than Zen 4 at the same frequency, which could give the P174 a per-core advantage at boost. The database does not quantify instructions per cycle, so this remains an architectural inference rather than a measured result.

The 8645HS has more PCIe lanes available to the CPU: 20 Gen 4 lanes versus 16 Gen 4 lanes on the P174. That difference affects storage and accelerator bandwidth in embedded systems. A system needing multiple high-speed NVMe drives or add-in cards would have more headroom with the 8645HS.

Memory bandwidth is identical at 89.6 GB/s, so both parts can feed their cores at the same peak rate. The P174's LPDDR5X support may alter real-world bandwidth depending on the memory configuration chosen by the system designer, but the rated maximum matches.

Graphics capability favors the P174 by GPU tier: Radeon 880M versus Radeon 760M. The 880M sits above the 760M in AMD's integrated lineup, suggesting more execution units and higher shader throughput. The database does not list clock speeds or compute unit counts, so the comparison stays at the product-tier level.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen AI Embedded P174 has 10 cores and 20 threads. The AMD Ryzen Embedded 8645HS has 6 cores and 12 threads.

Q: Do both processors use the same socket?

A: Yes, both use AMD Socket FP8.

Q: What is the TDP difference between the two?

A: The P174 has a 28 W TDP. The 8645HS has a 45 W TDP.

Q: Which processor supports LPDDR5X memory?

A: Only the P174 supports LPDDR5X. The 8645HS supports DDR5 only. Both support DDR5.

Q: What is the boost clock on each processor?

A: Both processors have a 5.00 GHz boost clock.

Q: Which processor has more PCIe lanes?

A: The 8645HS has 20 Gen 4 lanes (CPU only). The P174 has 16 Gen 4 lanes (CPU only).

Specification Differences

| Specification | AMD Ryzen AI Embedded P174 | AMD Ryzen Embedded 8645HS |

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

| Series | None listed | 8000 series |

| Cores | 10 | 6 |

| Threads | 20 | 12 |

| Base clock | 2.00 GHz | 4.30 GHz |

| TDP | 28 W | 45 W |

| Codename | Gorgon Point | Hawk Point |

| Generation | Ryzen AI Embedded (Zen 5 / Zen 5c) | Ryzen Embedded (Zen 4 (Hawk Point)) |

| Architecture | Not listed | Zen 4 |

| Transistors | Not listed | 25,000 million |

| Die size | 233 mm² | 178 mm² |

| L1 cache | 80 KB (per core) | 64 KB (per core) |

| L3 cache | 16 MB | 16 MB (shared) |

| Memory support | DDR5, LPDDR5X | DDR5 |

| PCIe | Gen 4, 16 lanes (CPU only) | Gen 4, 20 lanes (CPU only) |

| Integrated graphics | Radeon 880M | Radeon 760M |

| Release date | 2026-02-28 | 2024-04-01 |

The two processors share identical L2 cache (1 MB per core), memory bus width (dual-channel), memory bandwidth (89.6 GB/s), ECC support (enabled), process node (4 nm), foundry (TSMC), socket (FP8), boost clock (5.00 GHz), market segment (mobile), production status (active), and multiplier lock (locked). The P174's larger die, newer core architecture, higher core count, lower TDP, and higher-tier integrated GPU position it for parallel and graphics-oriented embedded workloads. The 8645HS's higher base clock, additional PCIe lanes, and smaller die make it attractive for lightly threaded, I/O-heavy, or thermally generous designs.