AMD Ryzen 7 7745HX vs AMD Ryzen 7 8840HS Comparison

The Verdict

The benchmark data is unambiguous. The AMD Ryzen 7 7745HX outperforms the AMD Ryzen 7 8840HS in every recorded head-to-head benchmark. The 7745HX has a perfect 17 wins out of 17 comparisons, while the 8840HS records zero wins. The 7745HX commands a 31.5% lead in Cinebench R15 multi-core, a 29.1% gap in Cinebench R23 multi-core, and a 25.8% advantage in Geekbench multi-core. If the priority is raw computing throughput, the 7745HX is the target choice. The 8840HS, however, is not without its own rationale. It operates at a 28 W TDP compared to the 55 W TDP of the 7745HX, a significant difference for mobile system design. The 8840HS, with its Radeon 780M integrated graphics, is positioned for a more power-conscious segment. The data, with the 8840HS at the 84th percentile and the 7745HX at the 83rd percentile among all CPUs, suggests they occupy similar overall standing, yet their performance profiles diverge sharply. Users who need sustained multi-threaded performance should choose the 7745HX. Users who prioritize a lower power envelope and are willing to accept a measured performance deficit should choose the 8840HS. The 7745HX is the faster processor in all recorded tests, but the 8840HS is the more efficient design on paper. The 8840HS offers a larger L3 cache size difference and a smaller process node, which are relevant factors in its favor. The verdict is clear cut: the 7745HX for performance, the 8840HS for efficiency.

Architecture Differences

The two processors share the same Zen 4 architecture, but they are built on different nodes and for different purposes. The 8840HS is built on a 4 nm process at TSMC, with a die size of 178 mm² and 25,000 million transistors. The 7745HX is on a 5 nm process at the same foundry, with a die size of 71 mm² and 6,4 570 million transistors. The 8840HS is codenamed Hawk Point, part of the 8000 series, and uses AMD Socket FP8. The 7745HX is codenamed Dragon Range, part of the 7000 series, and uses AMD Socket FL1. The 8840HS has 64 MB of shared L3 cache of 16 MB per core, while the 7745HX doubles that with 32 MB of shared L3 cache per core. The 8840HS has a base clock of 3.30 GHz and a boost clock of 5.10, the 7745HX has a base clock of 3.60 and a boost clock of 5.10. The core count is identical: 8 cores and 16 threads each. The 8840HS supports PCIe Gen 4 with 20 lanes, while the 7745HX supports PCIe Gen 5 with 28 lanes. The 8840HS has a memory bandwidth of 89.6 GB/s, the 7745HX has 83.2 GB/s. The 8840HS does not support ECC memory, but the 7745HX does. The integrated graphics differ: the 8840HS has a Radeon 780M, the 7745HX has a Radeon 610M. The release dates differ, with the 8840HS released in December 2023, the 7745HX in January 2023. The 7745HX has an unlocked multiplier while the 8840HS does not. The data shows a clear architectural split: one chip is a denser, power-efficient design, the other a larger, more performance-oriented design with more cache.

Head-to-Head Benchmarks

The 7745HX wins every single recorded benchmark, but the margin varies significantly by workload. In Cinebench R15 single-core, the 7745HX scores 294.5 against 270 for the 8840HS, a lead of 8.3%. The Cinebench R23 single-core gap is smaller at 6.1%, with scores of 1850 and 1737. Geekbench single-core shows a larger gap of 19.7%, with the 7745HX at 2366 and the 8840HS at 1899. PassMark single-thread shows a modest 8.1% lead for the 7745HX, scoring 3947 versus 3626. The single-thread results are the closest category across all tests, indicating that the 8840HS, despite its lower base clock, is competitive on a per-core basis. The multi-threaded results are where the 7745HX pulls away. Cinebench R15 multi-core shows a 31.5% lead, with scores of 2986 and 2045. Cinebench R23 multi-core shows a 29.1% lead, with scores of 18452.5 and 13082. Geekbench multi-core shows a 25.8% lead, with scores of 13613 and 10104. PassMark multi-thread shows a 23.3% lead, with scores of 32581 and 24990. The largest single delta is in PassMark find prime numbers, where the 7745HX scores 156 against 79, a massive 49.4% advantage. PassMark physics also shows a large gap of 32.3%, with scores of 1697 and 1149. PassMark extended instructions shows a 28.5% lead, with scores of 28966 and 20714. PassMark data compression shows a 23.6% lead, with scores of 383322 and 292888. PassMark data encryption shows a 23.2% lead, with scores of 22967 and 17650. PassMark floating point math shows an 18.2% lead, with scores of 64297 and 52582. PassMark integer math shows a 14.6% lead, with scores of 105773 and 90382. PassMark random string sorting shows a 20.1% lead, with scores of 44474 and 35517. The 7745HX wins across the board, but the margin is workload dependent. The 8840HS is closest in single-thread tests and furthest behind in prime number finding and multi-core render tests.

FAQ

Q: Which CPU is faster in multi-core workloads?

A: The AMD Ryzen 7 7745HX is faster in every multi-core benchmark. It leads by 31.5% in Cinebench R15 multi-core, 29.1% in Cinebench R23 multi-core, and 25.8% in Geekbench multi-core.

Q: How do the two processors compare in single-core performance?

A: The 7745HX also wins all single-core tests, but by smaller margins. It leads by 8.3% in Cinebench R15 single-core, 6.1% in Cinebench R23 single-core, and 8.1% in PassMark single-thread.

Q: What is the most significant performance difference between the two?

A: The largest recorded difference is in PassMark find prime numbers, where the 7745HX scores 156 compared to 79 for the 8840HS, a 49.4% gap.

Q: Do both CPUs have the same core and thread count?

A: Yes, both have 8 cores and 16 threads.

Q: Which CPU has more L3 cache?

A: The AMD Ryzen 7 7745HX has 32 MB of shared L3 cache, while the AMD Ryzen 7 8840HS has 16 MB of shared L3 cache.

Q: What is the difference in their TDP ratings?

A: The 8840HS has a TDP of 28 W, while the 7745HX has a TDP of 55 W.

Where Each One Wins

The AMD Ryzen 7 7745HX is the clear winner in every benchmark category recorded. It excels in multi-threaded tasks like video rendering, 3D physics simulation, and data compression. The 31.5% lead in Cinebench R15 multi-core and the 29.1% lead in Cinebench R23 multi-core are indicative of its strength in sustained CPU-heavy workloads. The 32.3% lead in PassMark physics further confirms its suitability for simulation and scientific computing tasks. The 49.4% lead in PassMark find prime numbers suggests a particular advantage in integer-heavy, algorithmically intense workloads. The 25.8% lead in Geekbench multi-core reinforces its position as the superior choice for highly parallel applications. The 23.2% lead in data encryption and 23.6% lead in data compression also point to its dominance in data processing tasks. The 7745HX also wins every single-thread test, making it the faster choice even for lightly threaded applications, though the margins are much narrower there. The AMD Ryzen 7 8840HS, while losing all synthetic benchmarks, still has its own niche. It has a lower TDP of 28 W versus 55 W, which is a decisive factor for ultraportable laptops where battery life and thermals are primary concerns. It also has a different integrated GPU, the Radeon 780M, which is a more capable integrated solution than the Radeon 610M in the 7745HX. The 8840HS also offers a higher memory bandwidth of 89.6 GB/s compared to 83.2 GB/s, which could matter in memory-sensitive scenarios. It is built on a smaller 4 nm process node, which is a contributing factor to its lower power draw. The 8840HS represents a trade-off, offering a lower performance envelope in exchange for a significant reduction in peak performance, making it the choice for designs where power efficiency is prioritized over raw speed.

Specification Differences

The two processors differ in several key specifications. The 8840HS is part of the 8000 series, while the 7745HX is part of the 7000 series. The process nodes differ: the 8840HS is on a 4 nm node, the 7745HX is on a 5 nm node. The 8840HS has a die size of 178 mm² and 25,000 million transistors, while the 7745HX has a die size of 71 mm² and 6,570 million transistors. The base clocks differ: 3.30 GHz for the 8840HS and 3.60 GHz for the 7745HX, though both share a 5.10 GHz boost clock. The TDP is a major difference, with the 8840HS at 28 W and the 7745HX at 55 W. The sockets are different: AMD Socket FP8 for the 8840HS and AMD Socket FL1 for the 7745HX. The L3 cache differs, with the 8840HS having 16 MB shared and the 7745HX having 32 MB shared. Memory bandwidth differs slightly, with the 8840HS at 89.6 GB/s and the 7745HX at 83.2 GB/s. ECC memory support is present on the 7745HX but not on the 8840HS. PCIe support differs, with the 8840HS offering Gen 4 with 20 lanes and the 7745HX offering Gen 5 with 28 lanes. The integrated graphics differ, with the 8840HS featuring the Radeon 780M and the 7745HX featuring the Radeon 610M. The multiplier is unlocked on the 7745HX but locked on the 8840HS. The release dates differ, with the 8840HS released in December 2023 and the 7745HX in January 2023. The part numbers also differ, with the 8840HS having multiple part numbers and the 7745HX having one. The codenames are different: Hawk Point for the 8840HS and Dragon Range for the 7745HX.