AMD Ryzen 5 PRO 8645HS vs AMD Ryzen 9 PRO 6950HS Comparison

The AMD Ryzen 5 PRO 8645HS and AMD Ryzen 9 PRO 6950HS are both mobile processors from AMD, but they represent different generations and design targets. The 8645HS is a 6-core Zen 4 part on TSMC's 4 nm process, while the 6950HS is an 8-core Zen 3+ part on 6 nm. Head-to-head data shows the newer chip winning 11 of 15 comparisons, but the older chip still holds advantages in several throughput-oriented workloads.

Head-to-Head Benchmarks

The largest gap in the entire comparison appears in Cinebench R23. The 8645HS scores 19742 in multicore against 11515 for the 6950HS, a 71.4% advantage. Single-core R23 is even more lopsided: 2787 versus 1514, an 84.1% lead. These are enormous margins for a 6-core chip against an 8-core chip, and they reflect the architectural leap from Zen 3+ to Zen 4.

Cinebench R15 shows the same pattern with smaller gaps. The 8645HS leads multicore 1989 to 1913, a 4% edge, and single-core 280 to 239, a 17.2% edge. The 8645HS also has a Cinebench R20 result of 8291 multicore and 1170 single-core in the database, though the 6950HS has no R20 score recorded.

Passmark results are split. The 8645HS wins 7 of the 11 Passmark entries. Single-thread goes 3858 versus 3400, a 13.5% lead. Physics is 1208 versus 1043, a 15.8% lead. Random string sorting is 35472 versus 29350, a 20.9% lead. Extended instructions favor the 8645HS at 21212 versus 18897, a 12.3% lead. Find prime numbers is 73 versus 56, a 30.4% lead. Multithread is 23569 versus 22775, a 3.5% lead.

The 6950HS wins four Passmark tests. Integer math is its biggest win: 88124 versus 72740, a 17.5% advantage. Data compression goes 282624 versus 265826, a 5.9% edge. Floating point math is 48096 versus 45481, a 5.4% edge. Data encryption is 17837 versus 17387, a 2.5% edge. The 6950HS also has Geekbench scores of 8756 multicore and 1903 single-core in the database.

The average benchmark score tells a different story than the head-to-head count. The 6950HS sits at 31850, while the 8645HS is at 30879. That is a 3.1% gap in favor of the older chip, driven by its strong integer and compression results. Both processors sit at the 82nd percentile among all CPUs in the database.

Looking at nearest rivals, the 8645HS's closest competitor is the AMD Ryzen 7 8700F at 30746, a 0.4% difference, followed by the Intel Core i7-13700TE at 31028, a 0.5% gap. The 6950HS's nearest rival is the AMD Ryzen 9 7940HS at 31593, a 0.8% difference, with the Intel Core i5-14450HX at 32040, a 0.6% gap.

Where Each One Wins

The 8645HS is the clear winner for single-threaded and lightly threaded workloads. Its Cinebench R23 single-core score of 2787 is 84.1% above the 6950HS's 1514, and its R15 single-core score of 280 beats 239 by 17.2%. Passmark single-thread confirms the pattern at 3858 versus 3400, a 13.5% lead. For applications that depend on one or two cores, such as everyday productivity, web browsing, and many legacy applications, the 8645HS has a decisive edge.

The 8645HS also wins in several multi-threaded scenarios despite having only 6 cores and 12 threads against the 6950HS's 8 cores and 16 threads. Cinebench R23 multicore is the standout: 19742 versus 11515, a 71.4% lead. The R15 multicore result is closer at 1989 versus 1913, a 4% edge. Passmark multithread also favors the 8645HS at 23569 versus 22775, a 3.5% lead. Physics simulation, which often scales with core count, still goes to the 8645HS at 1208 versus 1043, a 15.8% lead.

The 6950HS wins where raw throughput and data manipulation matter. Integer math is its strongest category: 88124 versus 72740, a 17.5% advantage. Data compression favors it at 282624 versus 265826, a 5.9% edge. Floating point math goes its way at 48096 versus 45481, a 5.4% edge. Data encryption is close but still favors the 6950HS at 17837 versus 17387, a 2.5% edge. These results suggest the 8-core chip retains an advantage in workloads that can use all cores for sustained number crunching, even though its older architecture is slower per clock.

Architecture Differences

The two processors come from different generations and process nodes. The 8645HS is built on Zen 4 architecture with the Hawk Point codename, fabricated on TSMC's 4 nm process. The 6950HS uses Zen 3+ with the Rembrandt codename, on TSMC's 6 nm process. The die sizes reflect the difference: the 8645HS measures 178 mm², while the 6950HS is larger at 208 mm². The 8645HS packs 25,000 million transistors; the database does not list a transistor count for the 6950HS.

Core and thread counts differ. The 8645HS has 6 cores and 12 threads, while the 6950HS has 8 cores and 16 threads. Clock speeds also differ: the 8645HS runs at a 4.30 GHz base and 5.00 GHz boost, while the 6950HS runs at 3.30 GHz base and 4.90 GHz boost. The 8645HS has a higher TDP at 45 watts versus 35 watts for the 6950HS.

Cache layouts are similar in L1 and L3 but differ in L2. Both have 64 KB of L1 per core and 16 MB of shared L3. The 8645HS has 1 MB of L2 per core, while the 6950HS has 512 KB per core. That means the 8645HS has 6 MB of total L2 against 4 MB for the 6950HS, a meaningful difference for workloads that fit in L2.

Memory support is DDR5 for both, with dual-channel buses. The 8645HS has a higher memory bandwidth at 89.6 GB/s versus 76.8 GB/s for the 6950HS. The 8645HS supports ECC memory; the 6950HS does not. Both use PCIe Gen 4 with 20 lanes from the CPU.

Integrated graphics differ. The 8645HS carries a Radeon 760M, while the 6950HS carries a Radeon 680M. Both are mobile processors on AMD Socket FP7, and both are in active production. The 8645HS was released in April 2024, while the 6950HS came out in April 2022. Neither has an unlocked multiplier.

FAQ

Q: Which processor has a higher boost clock?

A: The AMD Ryzen 5 PRO 8645HS boosts to 5.00 GHz, while the AMD Ryzen 9 PRO 6950HS boosts to 4.90 GHz.

Q: How many cores does each processor have?

A: The 8645HS has 6 cores and 12 threads. The 6950HS has 8 cores and 16 threads.

Q: Which processor is better for single-threaded workloads?

A: The 8645HS wins every single-threaded benchmark in the database. Its Cinebench R23 single-core score is 2787 versus 1514, an 84.1% lead, and its Passmark single-thread score is 3858 versus 3400, a 13.5% lead.

Q: Does the 6950HS win any benchmarks?

A: Yes. It wins Passmark integer math by 17.5%, data compression by 5.9%, floating point math by 5.4%, and data encryption by 2.5%.

Q: Do both processors support DDR5 memory?

A: Yes, both support DDR5 with dual-channel memory buses. The 8645HS has a memory bandwidth of 89.6 GB/s, while the 6950HS has 76.8 GB/s.

Q: Which processor supports ECC memory?

A: Only the 8645HS supports ECC memory. The 6950HS does not list ECC support.

The Verdict

The data points to a clear generational win for the 8645HS in most scenarios. It wins 11 of 15 head-to-head benchmarks, including every Cinebench test and every single-threaded Passmark test. Its Cinebench R23 multicore lead of 71.4% over a chip with two more cores is remarkable and speaks to the efficiency of Zen 4 on the 4 nm node.

The 6950HS is not obsolete, however. Its wins in integer math, data compression, floating point math, and data encryption show that the 8-core design still has value for specific throughput workloads. Its average benchmark score of 31850 is higher than the 8645HS's 30879, which means the overall picture is more balanced than the head-to-head win count suggests.

For buyers who prioritize single-threaded performance, modern architecture, ECC support, and higher memory bandwidth, the 8645HS is the stronger choice. For workloads that are heavily integer-bound or compression-heavy and can use all 8 cores, the 6950HS remains competitive. Both sit at the 82nd percentile among all CPUs, so either will handle mainstream mobile computing tasks well.

The 8645HS is the better all-rounder in this comparison. The 6950HS is the specialist that still wins in a few narrow categories.