AMD Ryzen Embedded 8640U vs AMD Ryzen Embedded 9950X Comparison

The Verdict

The database places both the AMD Ryzen Embedded 8640U and the AMD Ryzen Embedded 9950X at the 50th percentile among all CPUs, with no recorded benchmark scores or head-to-head wins for either. The data available describes two processors aimed at different segments: the 8640U is a mobile part in the 8000 series, while the 9950X is a desktop part in the 9000 series. The 9950X delivers 16 cores and 32 threads against the 8640U's 6 cores and 12 threads, a 10-core and 20-thread advantage. The 9950X also boosts higher at 5.70 GHz versus 4.90 GHz and carries a 170 W TDP against 28 W. The 8640U uses the AMD Socket FP8 and the 9950X uses AMD Socket AM5, so they are not interchangeable. The 9950X is the part for workloads that scale with core count and thread count, given its 16-core, 32-thread configuration and higher boost clock. The 8640U is the part for systems constrained by power and socket footprint, given its 28 W TDP and mobile socket. Neither part shows an advantage in the recorded aggregate score, so the choice rests entirely on the specification split.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen Embedded 9950X has 16 cores and 32 threads. The AMD Ryzen Embedded 8640U has 6 cores and 12 threads.

Q: What are the boost clocks of the two processors?

A: The AMD Ryzen Embedded 8640U boosts to 4.90 GHz. The AMD Ryzen Embedded 9950X boosts to 5.70 GHz.

Q: Do the two processors use the same socket?

A: No. The 8640U uses AMD Socket FP8, and the 9950X uses AMD Socket AM5.

Q: Do both processors support ECC memory?

A: Yes. Both list ECC memory support as true.

Q: Which processor has a larger L3 cache?

A: The AMD Ryzen Embedded 9950X has 64 MB of shared L3 cache. The AMD Ryzen Embedded 8640U has 16 MB of shared L3 cache.

Q: Are both processors currently in production?

A: Yes. Both list production status as active.

Architecture Differences

The two processors come from different generations within the Ryzen Embedded lineup. The 8640U belongs to the 8000 series with the Zen 4 architecture and the Hawk Point codename, with its generation listed as Ryzen Embedded (Zen 4 (Hawk Point)). The 9950X belongs to the 9000 series with the Zen 5 architecture and the Granite Ridge codename, with its generation listed as Ryzen Embedded (Zen 5 (Granite Ridge)). The architecture field for the 9950X is null in the database, but the generation string confirms Zen 5.

Both are built on a 4 nm process node at TSMC. The 8640U uses 25,000 million transistors on a 178 mm² die. The 9950X uses 16,630 million transistors on a die described as 2x 70.6 mm², meaning two chiplets. The 9950X has fewer transistors in the database record, but its die area is split across two smaller pieces. The 8640U is a monolithic design with a single larger die.

The cache hierarchy differs in the L1 and L3 levels. The 8640U has 64 KB of L1 per core and 1 MB of L2 per core, with 16 MB of shared L3. The 9950X has 80 KB of L1 per core and 1 MB of L2 per core, with 64 MB of L3. Neither part features 3D V-Cache in the recorded data. The 9950X has a higher L1 allocation per core and four times the L3 capacity, which matters for workloads with large working sets.

The integrated graphics differ as well. The 8640U carries the Radeon 760M. The 9950X carries a part listed only as Radeon Graphics. The database does not provide further graphics specifications for either.

Memory support is DDR5 for both, with dual-channel buses and identical memory bandwidth of 89.6 GB/s. Both support ECC memory. The PCIe interface differs: the 8640U uses Gen 4 with 20 lanes (CPU only), while the 9950X uses Gen 5 with 28 lanes (CPU only). The 9950X provides a newer PCIe generation and more lanes.

The multiplier unlocked status also differs. The 8640U has multiplier unlocked set to false. The 9950X has multiplier unlocked set to true. The 9950X has a known part number, 100-000001277E, while the 8640U part number is listed as unknown.

Specification Differences

The core count and thread count form the primary difference. The 8640U has 6 cores and 12 threads. The 9950X has 16 cores and 32 threads. Base clocks differ: 3.50 GHz for the 8640U versus 4.30 GHz for the 9950X. Boost clocks differ: 4.90 GHz versus 5.70 GHz. The TDP is a major split: 28 W for the 8640U versus 170 W for the 9950X.

Sockets are incompatible: AMD Socket FP8 for the 8640U, AMD Socket AM5 for the 9950X. The market segment differs: Mobile for the 8640U, Desktop for the 9950X. Release dates differ as well. The 8640U was released on 2024-04-01, and the 9950X on 2025-10-06. Neither has a launch MSRP in the database.

The cache specifications differ in L1 and L3. The 8640U has 64 KB of L1 per core. The 9950X has 80 KB of L1 per core. L2 is the same at 1 MB per core. L3 is 16 MB shared for the 8640U and 64 MB for the 9950X.

PCIe support differs in both generation and lane count. The 8640U supports Gen 4 with 20 lanes (CPU only). The 9950X supports Gen 5 with 28 lanes (CPU only). The integrated graphics names differ: Radeon 760M versus Radeon Graphics.

Transistor and die figures differ. The 8640U lists 25,000 million transistors on a 178 mm² die. The 9950X lists 16,630 million transistors on a 2x 70.6 mm² die configuration. Both use TSMC as the foundry and a 4 nm process node.

The multiplier unlocked field differs, and the part number field differs. The 8640U has multiplier unlocked false and an unknown part number. The 9950X has multiplier unlocked true and the part number 100-000001277E.

Head-to-Head Benchmarks

The database contains no recorded benchmark entries for either processor, and the head-to-head benchmark list is empty. The wins count for each part is zero. The aggregate benchmark score for both is zero, and the percentile rank for both is 50.

Without benchmark measurements, the specification data must carry the analysis. The 9950X holds a 10-core and 20-thread advantage over the 8640U. That translates to 2.67 times the core count and 2.67 times the thread count. In a scaling workload, the 9950X has the structural capacity to process more simultaneous threads, but the database provides no measured speedup to confirm scaling efficiency.

Clock speed favors the 9950X as well. Its base clock of 4.30 GHz is 0.80 GHz higher than the 8640U's 3.50 GHz. Its boost clock of 5.70 GHz is 0.80 GHz higher than the 8640U's 4.90 GHz. The 9950X also has a larger L3 cache at 64 MB versus 16 MB, a 48 MB difference, and more L1 per core at 80 KB versus 64 KB.

Memory bandwidth is identical at 89.6 GB/s for both, so that metric does not separate them. Both support DDR5 and dual-channel memory. ECC support is present on both.

PCIe capability favors the 9950X with Gen 5 and 28 lanes against Gen 4 and 20 lanes. The 9950X also has the unlocked multiplier, which permits overclocking if the platform allows. The 8640U has no such allowance in the database.

Power efficiency favors the 8640U by a wide margin in the recorded TDP. The 8640U draws 28 W, and the 9950X draws 170 W, a 142 W difference. For thermally constrained or battery-powered systems, that difference is decisive. The 8640U also uses the mobile socket, FP8, which aligns with compact system designs.

Release timing favors the 9950X as the newer part by roughly a year and a half. The 8640U released on 2024-04-01, and the 9950X released on 2025-10-06.

Where Each One Wins

The AMD Ryzen Embedded 9950X wins on raw compute resources. It has 16 cores and 32 threads, a 5.70 GHz boost clock, a 4.30 GHz base clock, 64 MB of L3 cache, and 80 KB of L1 per core. It also has PCIe Gen 5 with 28 lanes and an unlocked multiplier. These specifications point to workloads with high thread counts, high clock demands, and large cache footprints. The 170 W TDP indicates a platform designed to feed that power. The desktop socket AM5 and the desktop market segment confirm the intended use case as a stationary, high-throughput system.

The AMD Ryzen Embedded 8640U wins on power and platform constraints. Its 28 W TDP is dramatically lower than the 9950X's 170 W. It uses the mobile FP8 socket and is classified in the mobile market segment. It still provides 6 cores and 12 threads, a 4.90 GHz boost clock, 16 MB of L3 cache, and PCIe Gen 4 with 20 lanes. Those specifications fit embedded mobile or compact systems where power draw and physical socket size matter more than peak throughput. Its 4 nm process node and 25,000 million transistor count on a 178 mm² die describe a monolithic mobile design.

The shared traits keep both parts relevant in similar memory environments. Both use DDR5, dual-channel memory, 89.6 GB/s bandwidth, and ECC support. Neither part has 3D V-Cache. Both are active in production and built at TSMC on 4 nm.

The recorded data does not assign a performance winner. The percentile tie at 50 and the zero benchmark scores mean no measured comparison exists in the database. The verdict follows the specification split: the 9950X for maximum core count, clock speed, cache capacity, and PCIe bandwidth; the 8640U for minimal power draw and a mobile socket. Each part occupies a distinct position in the Ryzen Embedded lineup, and the data supports choosing based on the platform requirements rather than on any measured performance gap.