AMD Ryzen AI Embedded P185i vs AMD Ryzen Embedded 9900X Comparison

FAQ

Q: What are the core and thread counts of the AMD Ryzen AI Embedded P185i and the AMD Ryzen Embedded 9900X?

A: Both processors feature 12 cores and 24 threads.

Q: How do the base and boost clock speeds compare between the two chips?

A: The AMD Ryzen AI Embedded P185i has a base clock of 2.00 GHz and a boost clock of 5.10 GHz. The AMD Ryzen Embedded 9900X has a base clock of 4.40 GHz and a boost clock of 5.60 GHz.

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

A: The AMD Ryzen AI Embedded P185i has a TDP of 28 watts, while the AMD Ryzen Embedded 9900X has a TDP of 120 watts.

Q: Which sockets do these processors use?

A: The AMD Ryzen AI Embedded P185i uses the AMD Socket FP8, while the AMD Ryzen Embedded 9900X uses the AMD Socket AM5.

Q: What are the process nodes for both chips?

A: Both processors are manufactured on a 4 nm process node by TSMC.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen AI Embedded P185i and the AMD Ryzen Embedded 9900X support ECC memory.

Architecture Differences

The AMD Ryzen AI Embedded P185i and the AMD Ryzen Embedded 9900X share the same fundamental Zen 5 core architecture, but they are distinct products built for different market segments. The P185i belongs to the Gorgon Point codename family and is classified under the Ryzen AI Embedded generation, which explicitly lists Zen 5 and Zen 5c core types. This indicates a hybrid core arrangement, where some cores are full Zen 5 and others are the more compact Zen 5c variant, a design intended to balance performance and power efficiency in a mobile context. The 9900X, in contrast, uses the Granite Ridge codename and is listed as Zen 5 only, with no mention of Zen 5c cores. It is part of the Ryzen Embedded 9000 series and targets the desktop segment.

The physical packaging differs significantly. The P185i is built on a single die with a total die size of 233 mm². The 9900X is a dual-die design, consisting of two separate 70.6 mm² dies, for a combined silicon area that is smaller than the monolithic P185i. The 9900X also has a disclosed transistor count of 16,630 million, while the database does not record a transistor count for the P185i. Both are fabricated by TSMC on a 4 nm process node.

Cache hierarchies are a major architectural split. Both processors have 80 KB of L1 cache per core and 1 MB of L2 cache per core. The L3 cache, however, is vastly different: the P185i has 16 MB of shared L3 cache, while the 9900X has 64 MB of shared L3 cache. This quadruples the last-level cache capacity on the desktop part, which has substantial implications for workloads that rely on large resident data sets.

Memory support also diverges. The P185i supports both DDR5 and LPDDR5X memory types, reflecting its mobile and embedded AI positioning, where power and form factor flexibility are important. The 9900X supports only DDR5. Both use a dual-channel memory bus and achieve the same peak memory bandwidth of 89.6 GB/s. Both have ECC memory enabled.

I/O capabilities are another differentiator. The P185i provides PCIe Gen 4 with 16 lanes from the CPU. The 9900X provides PCIe Gen 5 with 24 lanes from the CPU, offering both a newer generation and more lanes. Integrated graphics differ as well: the P185i uses the Radeon 890M, a higher-tier integrated GPU, while the 9900X uses a generic Radeon Graphics solution. The P185i has a locked multiplier, while the 9900X has an unlocked multiplier, allowing user overclocking on the latter.

The release dates are recorded in the database, with the P185i launching later (2026-02-28) than the 9900X (2025-10-06). Both processors are listed with active production status.

Head-to-Head Benchmarks

The database contains no head-to-head benchmark results for the AMD Ryzen AI Embedded P185i versus the AMD Ryzen Embedded 9900X. There are also no individual benchmark scores, no average benchmark scores, and no nearest rival data recorded for either processor. The recorded percentile versus all CPUs is 50 for both parts, which is the default neutral value in the database, not an indication of measured performance.

Given the lack of measured performance data, the analysis must rely on the architectural and specification differences to infer relative capability. The most consequential difference is the thermal envelope. The P185i operates at a TDP of 28 watts, while the 9900X operates at 120 watts. This is a more than fourfold difference in power budget. The 9900X uses this additional power to sustain much higher clock speeds. Its base clock of 4.40 GHz is more than double the P185i's base clock of 2.00 GHz. Its boost clock of 5.60 GHz is 0.50 GHz higher than the P185i's 5.10 GHz boost.

In multi-threaded workloads that are sustained, the 9900X's higher sustained clocks and larger 64 MB L3 cache should provide a significant advantage. The 64 MB L3 cache is four times the 16 MB on the P185i, which reduces memory latency and improves throughput for data-intensive tasks. The P185i, with its lower clocks and smaller cache, would be expected to trail substantially in such scenarios, though the exact margin is not quantified in the database.

In single-threaded or lightly threaded workloads, the boost clock difference still favors the 9900X by 0.50 GHz. The P185i's advantage is not in raw performance but in efficiency. Its 28 watt TDP allows it to deliver similar architectural capabilities, 12 cores and 24 threads, in a much lower power envelope. The hybrid Zen 5 / Zen 5c core arrangement on the P185i likely allows it to idle or run light tasks on the more efficient Zen 5c cores, conserving power. The 9900X has no such hybrid design and would consume more power even at idle.

The P185i does offer a notable advantage in integrated graphics. The Radeon 890M is a higher-tier iGPU compared to the generic Radeon Graphics on the 9900X. For embedded AI workloads that leverage GPU compute, the P185i's iGPU may be more capable, though the database does not record specific graphics benchmarks. The 9900X compensates with PCIe Gen 5 and 24 lanes, which allows for a discrete GPU or other high-bandwidth accelerators to be attached, potentially offloading all graphics and compute work from the CPU.

Memory bandwidth is identical at 89.6 GB/s for both, meaning that the L3 cache size difference becomes the primary memory hierarchy advantage for the 9900X. For workloads with a working set larger than 16 MB but smaller than 64 MB, the 9900X will avoid many main memory accesses that the P185i must make.

Specification Differences

The following fields differ between the AMD Ryzen AI Embedded P185i and the AMD Ryzen Embedded 9900X:

• Base Clock: P185i 2.00 GHz, 9900X 4.40 GHz.
• Boost Clock: P185i 5.10 GHz, 9900X 5.60 GHz.
• TDP: P185i 28 watts, 9900X 120 watts.
• Socket: P185i AMD Socket FP8, 9900X AMD Socket AM5.
• Codename: P185i Gorgon Point, 9900X Granite Ridge.
• Generation: P185i Ryzen AI Embedded (Zen 5 / Zen 5c), 9900X Ryzen Embedded (Zen 5 (Granite Ridge)).
• Transistors: P185i not recorded, 9900X 16,630 million.
• Die Size: P185i 233 mm², 9900X 2x 70.6 mm².
• L3 Cache: P185i 16 MB, 9900X 64 MB.
• Memory Support: P185i DDR5 and LPDDR5X, 9900X DDR5 only.
• PCIe: P185i Gen 4, 16 lanes (CPU only), 9900X Gen 5, 24 lanes (CPU only).
• Integrated Graphics: P185i Radeon 890M, 9900X Radeon Graphics.
• Market Segment: P185i Mobile, 9900X Desktop.
• Release Date: P185i 2026-02-28, 9900X 2025-10-06.
• Multiplier Unlocked: P185i false, 9900X true.
• Part Number: P185i unknown, 9900X 100-000000662E.

Fields that are identical include: manufacturer (AMD), cores (12), threads (24), L1 cache (80 KB per core), L2 cache (1 MB per core), process node (4 nm), foundry (TSMC), memory bus (dual-channel), memory bandwidth (89.6 GB/s), ECC support (true), and production status (active).

The Verdict

The data in the database paints a clear picture of two processors with identical core and thread counts but fundamentally different design goals. The AMD Ryzen Embedded 9900X is the higher-performance part on paper. Its 4.40 GHz base clock and 5.60 GHz boost clock are substantially higher than the 2.00 GHz and 5.10 GHz of the AMD Ryzen AI Embedded P185i. Its 64 MB L3 cache is four times larger, and its 120 watt TDP budget allows those clocks to be sustained under load. For any compute-bound workload that is not limited by the thermal or power constraints of a mobile platform, the 9900X should deliver markedly better throughput. Its PCIe Gen 5 support with 24 lanes also gives it a clear path for high-bandwidth peripherals and discrete accelerators. The unlocked multiplier further enhances its flexibility for users who can manage the cooling required.

The AMD Ryzen AI Embedded P185i is designed for a different operating point. Its 28 watt TDP is less than one quarter of the 9900X's, making it suitable for systems where power consumption and heat dissipation are primary constraints. The hybrid Zen 5 / Zen 5c core configuration is a logical design choice for such a part, allowing the scheduler to place light workloads on the efficient cores. Its support for LPDDR5X memory is another indicator of its mobile intent, as it enables more compact memory layouts. The Radeon 890M integrated graphics is a more capable iGPU than the generic Radeon Graphics on the 9900X, which may matter for embedded AI inference or display workloads that do not use a discrete GPU.

The recorded data shows no benchmark scores for either part, so the verdict rests on architectural reasoning. The 9900X is the choice for raw performance, sustained multi-threaded execution, and systems with access to ample cooling and power. The P185i is the choice for embedded, mobile, or power-constrained deployments where 12 cores and 24 threads are required but the thermal envelope is tight. The P185i's later release date and its dedicated AI Embedded branding suggest it is a newer, more specialized product. The 9900X, with its desktop heritage and unlocked multiplier, is the more conventional high-performance part. Users who need PCIe Gen 5 bandwidth or large L3 cache must select the 9900X. Users who need LPDDR5X memory support or a more powerful integrated GPU must select the P185i.