AMD Ryzen 5 PRO 8645HS vs AMD Ryzen 7 7840HS Comparison

Head-to-Head Benchmarks

The direct comparison between the AMD Ryzen 5 PRO 8645HS and the AMD Ryzen 7 7840HS reveals a clear split: the Ryzen 7 wins most multithreaded and integer workloads, while the Ryzen 5 PRO takes the single-thread and newer Cinebench tests. Out of 15 shared benchmarks, the Ryzen 7 7840HS claims 10 wins, leaving 5 for the Ryzen 5 PRO 8645HS.

The most dramatic result is in Cinebench R23 single-core, where the Ryzen 5 PRO 8645HS scores 2787 against the Ryzen 7 7840HS's 1761, a 58.3% advantage. This is a massive gap for a single-threaded test and suggests the Ryzen 5 PRO's higher 4.30 GHz base clock, combined with a 5.00 GHz boost clock, translates into superior per-core performance in this workload. The Cinebench R23 multicore test also favors the Ryzen 5 PRO, with a score of 19742 versus 15102, a 30.7% lead. This is surprising given the Ryzen 7 has 8 cores and 16 threads compared to 6 cores and 12 threads, yet the Ryzen 5 PRO still wins by nearly a third.

The Ryzen 7 7840HS counters decisively in the PassMark suite. In integer math, it scores 98682 against 72740, a 26.3% advantage. Floating point math follows with 59921 versus 45481, a 24.1% lead. Data compression shows the Ryzen 7 at 345536 versus 265826, a 23.1% margin. The Ryzen 7 also leads in data encryption (20627 vs 17387, 15.7% ahead), extended instructions (25747 vs 21212, 17.6% ahead), and find prime numbers (88 vs 73, 17% ahead). In the PassMark multithread test, the Ryzen 7 scores 28633 versus 23569, a 17.7% lead, and in physics it posts 1376 versus 1208, a 12.2% advantage. Random string sorting rounds out the Ryzen 7's wins at 40364 versus 35472, a 12.1% margin.

The Ryzen 5 PRO also wins the Cinebench R15 single-core test with 280 versus 274, a 2.2% edge, and both PassMark single-thread tests (3858 vs 3753, 2.8% ahead). However, in Cinebench R15 multicore, the Ryzen 7 wins 2222.84 versus 1989, a 10.5% margin, which aligns with its core advantage.

The average benchmark scores tell a similar story: the Ryzen 5 PRO 8645HS has an average score of 30879, while the Ryzen 7 7840HS averages 29955. The Ryzen 5 PRO sits at the 82nd percentile of all CPUs, and the Ryzen 7 at the 81st, so they are nearly identical in overall standing. The Ryzen 5 PRO's nearest rivals include the AMD Ryzen 7 8700F (0.4% ahead), the Intel Core i7-13700TE (0.5% behind), and the AMD Ryzen 9 8945HS (0.6% behind). The Ryzen 7 7840HS's nearest rivals include the AMD Ryzen 7 8845HS (0% delta), the AMD Ryzen 7 5800XT (0.3% ahead), and the AMD Ryzen 7 7840H (0.3% ahead). This places both chips in a tight performance cluster, with the Ryzen 5 PRO holding a slight overall edge despite losing more individual tests.

Where Each One Wins

The Ryzen 5 PRO 8645HS demonstrates its strengths in single-threaded and lightly threaded workloads. It wins both Cinebench single-core tests and the PassMark single-thread test. The 58.3% lead in Cinebench R23 single-core is the standout result, indicating that for applications that rely on one or two fast cores, this chip is clearly superior. The 30.7% margin in Cinebench R23 multicore is also notable, but given the Ryzen 7's additional cores, this may reflect differences in boost behavior or thermal management rather than raw core count.

The Ryzen 7 7840HS is the choice for heavily multithreaded integer and floating-point tasks. Its wins in PassMark integer math, floating point math, data compression, data encryption, extended instructions, and find prime numbers all point to sustained throughput advantages. The 26.3% lead in integer math and 24.1% in floating point are substantial, and the 17.7% multithread win reinforces its position as the better chip for parallel compute. The physics test (12.2% ahead) and random string sorting (12.1% ahead) also favor the Ryzen 7, making it the stronger option for scientific computing, data processing, and rendering workloads that scale across cores.

For single-threaded responsiveness, the Ryzen 5 PRO is the winner. For multi-threaded productivity, the Ryzen 7 takes the lead. The Cinebench R23 results are the exception, where the Ryzen 5 PRO dominates both single and multicore, but the PassMark suite heavily favors the Ryzen 7. Users should weigh which benchmark suite aligns with their typical workloads.

Architecture Differences

Both processors are built on AMD's Zen 4 architecture, but they come from different codenames: the Ryzen 5 PRO 8645HS uses Hawk Point, while the Ryzen 7 7840HS uses Phoenix. The 4 nm process node and TSMC as the foundry are identical, as are the transistor counts at 25,000 million and the die size at 178 mm². Both use the same L1 cache of 64 KB per core, L2 of 1 MB per core, and a shared L3 of 16 MB. Neither has 3D V-Cache.

The core configurations differ significantly. The Ryzen 5 PRO has 6 cores and 12 threads, while the Ryzen 7 has 8 cores and 16 threads. This is the primary architectural difference and explains the Ryzen 7's multithreaded PassMark wins. The base clocks also differ: 4.30 GHz for the Ryzen 5 PRO versus 3.80 GHz for the Ryzen 7. The boost clocks are closer, with the Ryzen 5 PRO at 5.00 GHz and the Ryzen 7 at 5.10 GHz, giving the Ryzen 7 a slight boost advantage.

The integrated graphics differ as well: the Ryzen 5 PRO pairs with Radeon 760M, while the Ryzen 7 uses Radeon 780M. This suggests the Ryzen 7 has a stronger iGPU, though no direct graphics benchmarks are in the database. The sockets are different: AMD Socket FP7 for the Ryzen 5 PRO and AMD Socket FP8 for the Ryzen 7, which may affect motherboard compatibility.

Memory support is identical: DDR5, dual-channel, with a bandwidth of 89.6 GB/s and ECC support. Both also feature PCIe Gen 4 with 20 lanes (CPU only). The production status is Active for both, and neither has an unlocked multiplier.

Specification Differences

The key specification differences between the two processors are straightforward:

• Cores: 6 (Ryzen 5 PRO) vs 8 (Ryzen 7)
• Threads: 12 (Ryzen 5 PRO) vs 16 (Ryzen 7)
• Base Clock: 4.30 GHz (Ryzen 5 PRO) vs 3.80 GHz (Ryzen 7)
• Boost Clock: 5.00 GHz (Ryzen 5 PRO) vs 5.10 GHz (Ryzen 7)
• TDP: 45 W (Ryzen 5 PRO) vs 35 W (Ryzen 7)
• Socket: AMD Socket FP7 (Ryzen 5 PRO) vs AMD Socket FP8 (Ryzen 7)
• Integrated Graphics: Radeon 760M (Ryzen 5 PRO) vs Radeon 780M (Ryzen 7)
• Release Date: 2024-04-15 (Ryzen 5 PRO) vs not recorded (Ryzen 7)
• Part Numbers: 100-000001315(FP7r2), 100-000001388(FP7) for the Ryzen 5 PRO; 100-000000955(FP7r2), 100-000000964(FP7), 100-000001129(FP8) for the Ryzen 7

The TDP difference is notable: the Ryzen 5 PRO is rated at 45 W, while the Ryzen 7 is rated at 35 W. This means the Ryzen 5 PRO may draw more power but also explains its higher base clock and single-thread performance. The Ryzen 7 compensates with more cores and a higher boost clock.

FAQ

Q: Which processor has the higher single-core score in Cinebench R23?

A: The AMD Ryzen 5 PRO 8645HS scores 2787, which is 58.3% higher than the AMD Ryzen 7 7840HS's 1761.

Q: How much faster is the Ryzen 7 7840HS in PassMark integer math?

A: The Ryzen 7 scores 98682 versus 72740 for the Ryzen 5 PRO, a 26.3% advantage.

Q: What is the core and thread count difference?

A: The Ryzen 5 PRO has 6 cores and 12 threads, while the Ryzen 7 has 8 cores and 16 threads.

Q: Which chip has the higher base clock?

A: The Ryzen 5 PRO 8645HS has a base clock of 4.30 GHz, compared to 3.80 GHz for the Ryzen 7 7840HS.

Q: What is the TDP difference between the two?

A: The Ryzen 5 PRO is rated at 45 W, while the Ryzen 7 is rated at 35 W.

Q: Do both processors support ECC memory?

A: Yes, both list ECC memory support as true.

The Verdict

The data indicates a clear division of roles. Users prioritizing single-threaded performance and the specific Cinebench R23 workloads should choose the AMD Ryzen 5 PRO 8645HS. Its 58.3% lead in Cinebench R23 single-core and 30.7% lead in Cinebench R23 multicore are decisive, and its 2.8% edge in PassMark single-thread confirms faster per-core execution. The 45 W TDP and higher base clock suggest it can sustain higher frequencies for bursty tasks.

Users prioritizing heavily multithreaded workloads, particularly those measured by PassMark, should choose the AMD Ryzen 7 7840HS. It wins 10 of 15 head-to-head tests, with leads ranging from 12.1% in random string sorting to 26.3% in integer math. The 8-core, 16-thread configuration is better suited for parallel compute, data compression, and encryption tasks. Its 35 W TDP also indicates lower power draw, which may benefit battery life in mobile systems.

The average benchmark scores are close, with the Ryzen 5 PRO at 30879 and the Ryzen 7 at 29955, and both sit at the 81st or 82nd percentile of all CPUs. Neither chip dominates outright, and the choice depends entirely on workload mix. For single-thread responsiveness and Cinebench-specific tasks, the Ryzen 5 PRO is the data-backed pick. For sustained multithreaded throughput across the PassMark suite, the Ryzen 7 is the clear winner. The Ryzen 7's stronger Radeon 780M integrated graphics also give it an edge for light gaming or GPU-accelerated tasks, though no direct benchmarks confirm this. Ultimately, the Ryzen 5 PRO 8645HS is for users who value fast single-core performance, while the Ryzen 7 7840HS is for those who need maximum parallel compute.