AMD Ryzen AI Embedded P185i vs AMD Ryzen Embedded 8640U Comparison

FAQ

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

A: The AMD Ryzen AI Embedded P185i has 12 cores and 24 threads, while the AMD Ryzen Embedded 8640U has 6 cores and 12 threads. The P185i doubles the thread count of the 8640U.

Q: How do the boost clock speeds compare?

A: The Ryzen AI Embedded P185i boosts up to 5.10 GHz, while the Ryzen Embedded 8640U reaches 4.90 GHz. The P185i holds a 0.20 GHz advantage in maximum boost frequency.

Q: Which processor has the larger L3 cache?

A: Both processors feature 16 MB of L3 cache. The P185i lists it as 16 MB without a shared designation, whereas the 8640U specifies 16 MB shared.

Q: Do both processors support ECC memory?

A: Yes, both the AMD Ryzen AI Embedded P185i and the AMD Ryzen Embedded 8640U have ECC memory support enabled.

Q: What integrated graphics do these chips use?

A: The Ryzen AI Embedded P185i uses the Radeon 890M, while the Ryzen Embedded 8640U uses the Radeon 760M. The P185i carries the higher-tier integrated graphics solution.

Q: Are both processors built on the same process node?

A: Yes, both are fabricated on TSMC's 4 nm process node. However, the P185i uses the Gorgon Point codename with a Zen 5 / Zen 5c generation, while the 8640U uses the Hawk Point codename with Zen 4 architecture.

Where Each One Wins

The AMD Ryzen AI Embedded P185i wins on raw multi-threaded throughput based on its core configuration. With 12 cores and 24 threads versus 6 cores and 12 threads, the P185i has the structural advantage for heavily parallel workloads. The database shows no benchmark scores or head-to-head results were recorded for either processor, so wins must be inferred from architectural specifications. The P185i also takes the lead in maximum clock speed, boosting to 5.10 GHz versus 4.90 GHz on the 8640U. For single-threaded responsiveness and lightly threaded tasks, the higher boost clock gives the P185i a nominal edge.

The AMD Ryzen Embedded 8640U wins on PCIe lane count. The 8640U provides Gen 4 with 20 lanes (CPU only), while the P185i offers Gen 4 with 16 lanes (CPU only). That difference of 4 lanes gives the 8640U greater headroom for embedded I/O expansion, particularly in systems needing additional Gen 4 devices directly attached to the CPU. The 8640U also uses a smaller die at 178 mm² versus 233 mm² for the P185i, which can matter in space-constrained embedded designs. Both chips share the same 28 W TDP, dual-channel memory bus, and 89.6 GB/s memory bandwidth, so those areas do not differentiate the two.

For memory flexibility, the P185i supports both DDR5 and LPDDR5X, whereas the 8640U supports DDR5 only. That makes the P185i the better fit for designs targeting low-power LPDDR5X memory. The 8640U, however, has a transistor count listed at 25,000 million, while the P185i has no transistor figure recorded in the database. The 8640U also has an earlier release date of 2024-04-01, compared to the P185i's 2026-02-28, indicating a more mature production history. Both processors remain Active in production status.

Architecture Differences

The two processors come from different architectural generations. The AMD Ryzen AI Embedded P185i uses the Gorgon Point codename and belongs to the Ryzen AI Embedded generation built on Zen 5 / Zen 5c cores. The AMD Ryzen Embedded 8640U uses the Hawk Point codename and belongs to the Ryzen Embedded generation built on Zen 4 architecture. This generational gap means the P185i uses a newer core design with both full Zen 5 and dense Zen 5c cores, while the 8640U relies entirely on Zen 4 cores.

Both processors are manufactured on TSMC's 4 nm process node, so the fabrication process itself is identical. The die sizes differ notably: the P185i measures 233 mm², while the 8640U measures 178 mm². The larger die on the P185i reflects the additional cores and the newer graphics block. The 8640U has a recorded transistor count of 25,000 million, while the P185i has no transistor figure in the database.

Cache hierarchies show a key difference in L1 cache. The P185i has 80 KB of L1 cache per core, while the 8640U has 64 KB per core. Both share 1 MB of L2 cache per core. L3 cache is 16 MB on both processors, with the 8640U explicitly listing it as shared. The P185i's mixed Zen 5 and Zen 5c core arrangement likely explains the larger L1 allocation per core.

The integrated graphics differ as well. The P185i pairs with the Radeon 890M, while the 8640U uses the Radeon 760M. This positions the P185i as the stronger option for graphics-heavy embedded workloads, though no benchmark data exists in the database to quantify the performance delta. Both processors use the AMD Socket FP8, so they share the same physical socket interface.

Specification Differences

The core and thread counts represent the largest specification gap. The P185i provides 12 cores and 24 threads, exactly double the 6 cores and 12 threads of the 8640U. Base clocks go the other direction: the 8640U starts at 3.50 GHz, while the P185i starts at 2.00 GHz. Boost clocks favor the P185i at 5.10 GHz versus 4.90 GHz on the 8640U.

Both processors share a 28 W TDP, the AMD Socket FP8, a dual-channel memory bus, and 89.6 GB/s memory bandwidth. ECC memory support is enabled on both. The memory support lists differ: the P185i supports DDR5 and LPDDR5X, while the 8640U supports DDR5 only. PCIe connectivity differs, with the 8640U offering Gen 4 with 20 lanes (CPU only) versus Gen 4 with 16 lanes (CPU only) on the P185i.

The process node is identical at 4 nm from TSMC. The die sizes diverge, with the P185i at 233 mm² and the 8640U at 178 mm². The 8640U has a transistor count of 25,000 million; the P185i has no recorded figure. L1 cache per core is 80 KB on the P185i and 64 KB on the 8640U. L2 cache per core is 1 MB on both. L3 cache is 16 MB on both, with only the 8640U specifying it as shared.

The integrated graphics blocks differ: Radeon 890M on the P185i versus Radeon 760M on the 8640U. Release dates place the 8640U at 2024-04-01 and the P185i at 2026-02-28. Neither processor has an unlocked multiplier, and both are classified as Mobile market segment parts. The 8640U carries the series designation "8000 series," while the P185i has no series listed. Both processors have a percentile ranking of 50 against all CPUs in the database, and both have an average benchmark score of 0 due to the absence of recorded benchmark results.

Head-to-Head Benchmarks

The database contains no recorded head-to-head benchmark results for the AMD Ryzen AI Embedded P185i versus the AMD Ryzen Embedded 8640U. Both processors have empty benchmark arrays, zero wins in the head-to-head comparison, and zero average benchmark scores. The percentile ranking for both chips sits at exactly 50 against all CPUs, placing them at the median of the database's tracked processors. With no measured scores, the comparison must rely entirely on the specification-level differences captured in the database.

The most decisive specification gap is the core count. The P185i doubles the 8640U in both cores and threads, moving from 6 cores and 12 threads to 12 cores and 24 threads. In multi-threaded workloads that scale with core count, the P185i holds a clear structural advantage. The 8640U counters with a higher base clock of 3.50 GHz versus 2.00 GHz, which can improve responsiveness in lightly threaded tasks that do not engage all cores. Boost clocks favor the P185i at 5.10 GHz versus 4.90 GHz, giving it the higher ceiling for single-thread performance as well.

Memory bandwidth is identical at 89.6 GB/s for both, meaning the extra cores on the P185i share the same memory throughput as the fewer cores on the 8640U. The P185i's support for LPDDR5X alongside DDR5 gives it broader memory compatibility, while the 8640U is limited to DDR5. PCIe lane count favors the 8640U at 20 lanes versus 16 lanes, which matters for embedded systems that attach multiple Gen 4 peripherals directly to the CPU.

The integrated graphics difference is significant on paper. The Radeon 890M on the P185i sits above the Radeon 760M on the 8640U in AMD's embedded graphics lineup, though no benchmark numbers exist in the database to quantify the gap. The newer Zen 5 / Zen 5c core generation on the P185i also suggests higher instructions-per-clock efficiency compared to the Zen 4 cores on the 8640U, but again, the database records no measured performance data to confirm this. Both chips share the same 28 W TDP, so the P185i delivers its additional cores and larger die within the same power envelope as the 8640U.