AMD Ryzen 5 8645HS vs AMD Ryzen 7 PRO 6850H Comparison

The AMD Ryzen 5 8645HS and AMD Ryzen 7 PRO 6850H are both premium mobile processors, yet they are built on fundamentally different philosophies. The 8645HS leverages the newer Zen 4 architecture and a smaller 4 nm process to achieve commanding single-thread and lightly-threaded performance. The 6850H counters with eight physical cores (versus six) and a larger 6 nm design, which gives it a decisive edge in heavily parallel, multi-threaded workloads. The recorded data shows the 8645HS winning the majority of head-to-head tests (10 out of 15), but the 6850H’s victories in throughput and math-heavy tasks make it a more compelling choice for specific professional workflows.

Where Each One Wins

The AMD Ryzen 5 8645HS is the clear winner in anything that depends on high clock speeds and modern instruction efficiency. Its single-core benchmark results are dramatically ahead: 31.6% higher in Cinebench R15 single-core and 15.8% higher in Cinebench R23 single-core. In PassMark’s single-thread test, it posts a 10.5% advantage. This dominance extends to tasks that are sensitive to per-core speed, such as prime number finding, where it leads by 27.1%, and random string sorting, where it is 1.9% ahead. The 8645HS also wins in extended instruction workloads, with a 1.8% margin, and in physics simulation, though by a negligible 0.2%. For users running office productivity, web browsing, coding, or any application that relies on fast response times rather than raw core counts, the 8645HS is the superior part.

The AMD Ryzen 7 PRO 6850H wins where core count and memory bandwidth matter more than clock speed. Its PassMark multithread score is 3.5% higher, and it excels in integer math, running 15.6% ahead of the 8645HS. Floating-point math also favors the 6850H, with a 7.1% lead. Data compression shows a 10.1% advantage for the 6850H, and data encryption is 16.6% faster. These are classic multi-threaded, throughput-oriented workloads. The 6850H’s eight cores and wider memory bandwidth (76.8 GB/s versus 89.6 GB/s for the 8645HS, though the latter is higher) allow it to process more parallel work. The database indicates the 6850H is the better choice for video encoding, 3D rendering, virtualization, and heavy data analysis where the workload can fully utilize all available threads.

Architecture Differences

The two CPUs represent different generations of AMD’s mobile roadmap. The Ryzen 5 8645HS is part of the 8000 series, based on the Zen 4 architecture with the codename "Hawk Point." It is manufactured on a 4 nm process at TSMC, with a die size of 178 mm² and 25,000 million transistors. The Ryzen 7 PRO 6850H belongs to the 6000 series, based on Zen 3+ with the codename "Rembrandt." It uses a 6 nm process, also from TSMC, with a larger die size of 208 mm² and no transistor count listed in the database. This process difference is significant: the 4 nm node allows the 8645HS to hit higher clock speeds at the same 45 W TDP. The 8645HS has a base clock of 4.30 GHz and a boost clock of 5.00 GHz, while the 6850H operates at 3.20 GHz base and 4.70 GHz boost.

Core configuration differs as well. The 8645HS has 6 cores and 12 threads, while the 6850H has 8 cores and 16 threads. Cache hierarchies are not identical: both have 64 KB of L1 per core and 16 MB of shared L3, but the L2 cache is 1 MB per core on the 8645HS versus 512 KB per core on the 6850H. This means the 8645HS has a larger total L2 cache, which helps with per-core performance. Memory support is DDR5 dual-channel for both, but the 8645HS has a higher theoretical memory bandwidth of 89.6 GB/s compared to 76.8 GB/s for the 6850H. Both use PCIe Gen 4 with 20 lanes from the CPU. Integrated graphics differ: the 8645HS has a Radeon 760M, while the 6850H has a Radeon 680M. Both are active mobile parts, neither has an unlocked multiplier, and both lack ECC memory support. The 8645HS was released later, in December 2023, versus April 2022 for the 6850H.

Head-to-Head Benchmarks

The most striking result in the database is the single-core performance gap. In Cinebench R15 single-core, the 8645HS scores 270 against 205.1 for the 6850H, a 31.6% lead. This is the largest delta in either direction across all tests. Cinebench R23 single-core reinforces this, with the 8645HS at 1714 versus 1480, a 15.8% margin. PassMark single-thread shows 3653 for the 8645HS against 3305 for the 6850H, a 10.5% advantage. These numbers confirm that Zen 4’s IPC improvements and higher boost clock translate directly into faster single-threaded execution.

In multi-core Cinebench tests, the 8645HS still wins despite having fewer cores. Cinebench R15 multicore is close, 2094 versus 2085.5, a 0.4% margin. Cinebench R23 multicore shows a larger gap, 13220 versus 12393, a 6.7% lead for the 8645HS. This is notable because the 6850H has two more physical cores. The 8645HS’s higher clocks and larger L2 cache evidently compensate for the core deficit in these specific workloads.

The 6850H’s strongest counterattacks come in PassMark’s math and encryption tests. Integer math shows 86068 for the 6850H versus 72640 for the 8645HS, a 15.6% lead. Data encryption is 18681 versus 15588, a 16.6% margin. Data compression favors the 6850H at 295214 versus 265483, a 10.1% lead. Floating-point math is 48276 versus 44833, a 7.1% margin. PassMark multithread is 23417 versus 22586, a 3.5% lead. The 6850H also wins in one narrowly contested area: extended instructions, where the 8645HS takes a 1.8% lead (20003 versus 19654).

The 8645HS wins several smaller tests. Prime number finding is 75 versus 59, a 27.1% lead. Random string sorting is 31748 versus 31170, a 1.9% margin. Physics is 1095 versus 1093, a negligible 0.2% lead. Overall, the wins break down as 10 for the 8645HS and 5 for the 6850H.

FAQ

Q: Which CPU has the higher single-core performance?

A: The AMD Ryzen 5 8645HS is significantly faster. It leads by 31.6% in Cinebench R15 single-core, 15.8% in Cinebench R23 single-core, and 10.5% in PassMark single-thread.

Q: Does the Ryzen 7 PRO 6850H ever beat the 8645HS?

A: Yes, in five recorded tests. It wins PassMark multithread (3.5% lead), integer math (15.6%), floating-point math (7.1%), data compression (10.1%), and data encryption (16.6%).

Q: How do the core counts compare?

A: The 6850H has 8 cores and 16 threads, while the 8645HS has 6 cores and 12 threads. Despite this, the 8645HS wins both Cinebench R15 and R23 multicore tests, with leads of 0.4% and 6.7% respectively.

Q: What process nodes do these chips use?

A: The 8645HS is built on TSMC’s 4 nm process with a 178 mm² die. The 6850H uses TSMC’s 6 nm process with a 208 mm² die.

Q: Is there a difference in memory bandwidth support?

A: Yes. The 8645HS supports up to 89.6 GB/s, while the 6850H supports 76.8 GB/s. Both use dual-channel DDR5.

Q: Which CPU has the higher boost clock?

A: The 8645HS boosts to 5.00 GHz, while the 6850H boosts to 4.70 GHz. The 8645HS also has a higher base clock at 4.30 GHz versus 3.20 GHz.

The Verdict

The data points to a clear split based on workload type. The AMD Ryzen 5 8645HS is the superior processor for interactive and single-threaded applications. Its 31.6% lead in Cinebench R15 single-core and 15.8% lead in Cinebench R23 single-core are decisive. Even in multi-core Cinebench tests, it outperforms the 8-core 6850H, which is a strong testament to the efficiency of its Zen 4 cores and smaller 4 nm process. Users who prioritize snappy system response, application load times, and lightly-threaded productivity will find the 8645HS the better fit.

The AMD Ryzen 7 PRO 6850H is the better option for sustained parallel processing. Its wins in PassMark multithread, integer math, floating-point math, data compression, and encryption indicate that workloads which scale with core count will benefit from its 8-core design. For rendering, batch processing, scientific computing, and heavy multi-tasking, the 6850H’s 15.6% lead in integer math and 16.6% lead in encryption are meaningful advantages. The 8645HS may win more individual tests, but the 6850H wins the tests that matter most for throughput-oriented professionals.

There is no single winner across all scenarios. The 8645HS is the better general-purpose chip for most users due to its overwhelming single-thread advantage and impressive multi-core results despite fewer cores. The 6850H is the specialist choice for parallel workloads, where its additional cores and higher PassMark multithread score deliver tangible benefits. Both processors sit at the 83rd percentile against all CPUs in the database, with the 8645HS recording a slightly higher average benchmark score of 33244 versus 32812 for the 6850H. Choose the 8645HS for speed, choose the 6850H for parallel grunt.

Specification Differences

| Specification | AMD Ryzen 5 8645HS | AMD Ryzen 7 PRO 6850H |

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

| Cores | 6 | 8 |

| Threads | 12 | 16 |

| Base Clock | 4.30 GHz | 3.20 GHz |

| Boost Clock | 5.00 GHz | 4.70 GHz |

| Architecture | Zen 4 | Zen 3+ |

| Codename | Hawk Point | Rembrandt |

| Process Node | 4 nm | 6 nm |

| Die Size | 178 mm² | 208 mm² |

| L2 Cache | 1 MB (per core) | 512 KB (per core) |

| Memory Bandwidth | 89.6 GB/s | 76.8 GB/s |

| Socket | AMD Socket FP8 | AMD Socket FP7 |

| Integrated Graphics | Radeon 760M | Radeon 680M |

| Release Date | 2023-12-05 | 2022-04-18 |