AMD Ryzen 5 PRO 6650H vs AMD Ryzen 9 5900HX Comparison

The AMD Ryzen 9 5900HX and AMD Ryzen 5 PRO 6650H are both mobile processors from AMD, but they target different performance levels. The recorded data shows a clear winner: the Ryzen 9 5900HX wins all 17 head-to-head benchmark comparisons, with margins ranging from 1.2% to 38%. The Ryzen 5 PRO 6650H counters with a newer architecture, DDR5 memory support, and PCIe Gen 4, but it cannot match the 5900HX in any measured test. This analysis breaks down the architecture, benchmark results, and use cases for each.

The Verdict

The Ryzen 9 5900HX is the performance pick. It wins every benchmark in the database, including multi-threaded workloads like Cinebench R23 multi-core (12845 vs 9561, a 34.3% lead) and single-threaded tests like Geekbench single-core (1792 vs 1735, a 3.3% lead). The Ryzen 5 PRO 6650H is the platform pick: it supports DDR5 memory (76.8 GB/s vs 68.3 GB/s) and PCIe Gen 4, which the 5900HX lacks. But if you need raw CPU throughput, the 5900HX is the only choice. The data shows no scenario where the 6650H outperforms the 5900HX in a benchmark. The 5900HX also holds a higher average benchmark score (24822 vs 24364) and a higher percentile ranking (77th vs 76th). For users who prioritize compute performance, the 5900HX is the definitive answer.

Architecture Differences

The two processors come from different generations and architectures. The 5900HX uses Zen 3 (Cezanne) on a 7 nm process, while the 6650H uses Zen 3+ (Rembrandt) on a 6 nm process. The 5900HX has 8 cores and 16 threads, the 6650H has 6 cores and 12 threads. Both have a base clock of 3.30 GHz, but the 5900HX boosts to 4.60 GHz versus 4.50 GHz for the 6650H. Cache is identical: 64 KB L1 per core, 512 KB L2 per core, and 16 MB shared L3. The 5900HX has a die size of 180 mm² and 10,700 million transistors; the 6650H has a larger die at 208 mm² (transistor count not recorded). Memory support differs: the 5900HX uses DDR4 with 68.3 GB/s bandwidth, the 6650H uses DDR5 with 76.8 GB/s. PCIe also differs: Gen 3 on the 5900HX, Gen 4 with 20 lanes on the 6650H. Integrated graphics are Radeon Vega 8 on the 5900HX and Radeon 660M on the 6650H. The 5900HX has an unlocked multiplier, the 6650H is locked. Sockets are FP6 and FP7 respectively.

Head-to-Head Benchmarks

The 5900HX wins all 17 head-to-head tests. The largest margins appear in multi-threaded and math-heavy workloads. In PassMark integer math, the 5900HX scores 86735 against 62838, a 38% advantage. Cinebench R15 multi-core shows 2106 vs 1550, a 35.9% lead. Cinebench R23 multi-core follows at 34.3% (12845 vs 9561). PassMark data encryption is 34.5% higher (18188 vs 13518), and floating point math is 33% higher (47556 vs 35743). Data compression shows a 32.2% lead (287793 vs 217700), random string sorting 31.6% (30042 vs 22823), and extended instructions 29.5% (19488 vs 15044). Geekbench multi-core is 25.8% higher (8720 vs 6930), and PassMark multi-thread is 24.5% higher (22326 vs 17936). PassMark physics is 8.5% higher (909 vs 838). Single-thread margins are smaller: PassMark single-thread 2.2% (3178 vs 3110), Geekbench single-core 3.3% (1792 vs 1735), Cinebench R15 single-core 1.7% (240 vs 236), Cinebench R23 single-core 1.2% (1488 vs 1471), and PassMark find prime numbers 1.9% (53 vs 52). The pattern is clear: the 5900HX dominates in multi-threaded and math workloads, while single-thread performance is close but still favors the 5900HX.

FAQ

Q: Which CPU has more cores and threads?

A: The Ryzen 9 5900HX has 8 cores and 16 threads, while the Ryzen 5 PRO 6650H has 6 cores and 12 threads.

Q: What memory types do they support?

A: The 5900HX supports DDR4 with a bandwidth of 68.3 GB/s. The 6650H supports DDR5 with a bandwidth of 76.8 GB/s.

Q: Which has a higher boost clock?

A: The 5900HX boosts to 4.60 GHz, the 6650H to 4.50 GHz.

Q: Are they on the same socket?

A: No, the 5900HX uses AMD Socket FP6, the 6650H uses AMD Socket FP7.

Q: Which has better single-thread performance?

A: The 5900HX wins every single-thread test, but by small margins. For example, Cinebench R23 single-core is 1488 vs 1471 (1.2% lead), and PassMark single-thread is 3178 vs 3110 (2.2% lead).

Q: Which has better multi-thread performance?

A: The 5900HX wins by large margins. Cinebench R23 multi-core is 12845 vs 9561 (34.3% lead), and PassMark integer math is 86735 vs 62838 (38% lead).

Where Each One Wins

Based on the benchmark data, the Ryzen 9 5900HX wins in every compute scenario. It is the faster CPU for multi-threaded rendering, video encoding, data compression, encryption, and math-heavy tasks. The Ryzen 5 PRO 6650H does not win any benchmark, but it offers platform advantages that may matter for certain systems. It supports DDR5 memory, which provides higher bandwidth (76.8 GB/s vs 68.3 GB/s), and PCIe Gen 4, which enables faster storage and GPU connectivity. Its integrated Radeon 660M graphics may also differ from the Radeon Vega 8, though no graphics benchmarks are recorded. The 6650H is also built on a newer 6 nm process, which could affect power efficiency, but no power measurements are in the database. For users who need the latest memory and PCIe standards, the 6650H is the only option. For users who prioritize CPU performance, the 5900HX is the clear winner.

Specification Differences

The following specifications differ between the two processors:

• Cores: 8 (5900HX) vs 6 (6650H)
• Threads: 16 vs 12
• Boost clock: 4.60 GHz vs 4.50 GHz
• Socket: FP6 vs FP7
• Architecture: Zen 3 vs Zen 3+
• Process node: 7 nm vs 6 nm
• Die size: 180 mm² vs 208 mm²
• Transistors: 10,700 million (5900HX only; not recorded for 6650H)
• Memory support: DDR4 vs DDR5
• Memory bandwidth: 68.3 GB/s vs 76.8 GB/s
• PCIe: Gen 3 vs Gen 4, 20 lanes
• Integrated graphics: Radeon Vega 8 vs Radeon 660M
• Multiplier: Unlocked vs locked
• Release date: 2021-01-11 vs 2022-04-18
• Part number: 100-000000300 vs 100-000000543100-000000565

Identical specifications include base clock (3.30 GHz), TDP (45 W), L1 cache (64 KB per core), L2 cache (512 KB per core), L3 cache (16 MB shared), ECC support (false), market segment (mobile), and production status (active).