AMD Ryzen 5 8645HS vs AMD Ryzen 7 8700G Comparison

The AMD Ryzen 5 8645HS and AMD Ryzen 7 8700G are both Zen 4 parts from the 8000 series, but they serve fundamentally different market segments. The data shows a decisive performance advantage for the Ryzen 7 8700G across every single benchmark in the head-to-head comparison, with a 15-0 win record. However, the Ryzen 5 8645HS is a 45-watt mobile processor on AMD Socket FP8, while the Ryzen 7 8700G is a 65-watt desktop processor on AMD Socket AM5. The verdict is clear: for raw compute, the 8700G wins outright, but the 8645HS is the only one of the two designed for portable systems, making it the pick for laptops where the 8700G cannot be installed.

The Verdict

Benchmark results indicate that the AMD Ryzen 7 8700G is the superior processor in every measurable performance category. It leads the Ryzen 5 8645HS by margins ranging from 5.6% in Cinebench R15 single-core to 33.5% in PassMark physics. For users building or upgrading a desktop system, the 8700G is the clear choice. Its 8 cores and 16 threads provide a substantial advantage over the 6-core, 12-thread 8645HS, and its higher 5.10 GHz boost clock and 65-watt TDP allow it to sustain heavier workloads.

Conversely, the Ryzen 5 8645HS is the only option for mobile users. It is a mobile-market segment processor with a 45-watt TDP, designed for AMD Socket FP8. While its scores are lower—for example, 13,220 versus 17,128 in Cinebench R23 multi-core—it remains a highly capable chip, sitting at the 83rd percentile among all CPUs. The 8700G also sits at the 83rd percentile, but its average benchmark score of 33,089 is slightly higher than the 8645HS's 33,244, though the difference is within the margin of error. The verdict from the data is straightforward: choose the 8700G for any desktop build where power draw is not a constraint, and choose the 8645HS for a laptop or other mobile form factor.

Architecture Differences

Both processors share the same fundamental architecture: Zen 4, fabricated on a 4 nm process at TSMC. They also have identical transistor counts of 25,000 million and the same die size of 178 mm². The cache configuration is also identical, with 64 KB of L1 cache per core, 1 MB of L2 cache per core, and 16 MB of shared L3 cache. Neither chip has 3D V-Cache. The core difference lies in the number of cores and threads, with the 8700G featuring 8 cores and 16 threads versus the 8645HS's 6 cores and 12 threads.

The codenames differ, with the 8645HS being "Hawk Point" and the 8700G being "Phoenix". The integrated graphics also differ significantly: the 8645HS features a Radeon 760M, while the 8700G features a Radeon 780M. Both support DDR5 memory in a dual-channel configuration, but the 8645HS has a higher memory bandwidth at 89.6 GB/s compared to the 8700G's 83.2 GB/s. The 8700G has an unlocked multiplier for overclocking, while the 8645HS does not. The 8700G is also a desktop part with a launch MSRP of $329, while the 8645HS has no listed launch MSRP. The 8700G was released on 2024-01-07, roughly one month after the 8645HS, which was released on 2023-12-05.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 7 8700G has 8 cores and 16 threads, while the AMD Ryzen 5 8645HS has 6 cores and 12 threads.

Q: What is the performance difference in multi-core workloads?

A: The 8700G leads significantly. In Cinebench R23 multi-core, it scores 17,128 versus 13,220 for the 8645HS, a 22.8% advantage. In PassMark multi-thread, the 8700G scores 31,690 versus 22,586, a 28.7% lead.

Q: Are these processors based on the same architecture?

A: Yes, both are based on Zen 4 architecture and use a 4 nm process node from TSMC. They also have the same transistor count of 25,000 million and the same die size of 178 mm².

Q: Can the Ryzen 5 8645HS be used in a desktop motherboard?

A: No. The 8645HS uses AMD Socket FP8 and is classified in the mobile market segment, whereas the 8700G uses AMD Socket AM5 for desktop systems.

Q: Which processor has a higher boost clock?

A: The Ryzen 7 8700G has a higher boost clock of 5.10 GHz, compared to the Ryzen 5 8645HS's boost clock of 5.00 GHz.

Q: What is the difference in integrated graphics?

A: The 8645HS comes with a Radeon 760M, while the 8700G comes with a Radeon 780M. The 8700G's graphics are part of a desktop part with a higher 65-watt TDP.

Specification Differences

The two processors diverge on several key specifications. The most obvious is core count: the 8700G has 8 cores and 16 threads, while the 8645HS has 6 cores and 12 threads. Base clocks are close, with the 8645HS at 4.30 GHz and the 8700G at 4.20 GHz, but the boost clock favors the 8700G at 5.10 GHz versus 5.00 GHz. The TDP is a major differentiator: the 8645HS is rated at 45 watts, while the 8700G is rated at 65 watts. This is tied to their respective sockets and market segments: the 8645HS uses AMD Socket FP8 and is mobile, while the 8700G uses AMD Socket AM5 and is desktop.

Memory bandwidth also differs, with the 8645HS achieving 89.6 GB/s and the 8700G achieving 83.2 GB/s. The integrated graphics are different, with the 8645HS featuring a Radeon 760M and the 8700G featuring a Radeon 780M. The 8700G has an unlocked multiplier, while the 8645HS does not. Their release dates are separate, with the 8645HS launching on 2023-12-05 and the 8700G on 2024-01-07. The 8700G has a launch MSRP of $329, while the 8645HS has none listed. Lastly, their part numbers differ, with the 8645HS having multiple variants (100-000001320(FP7r2), 100-000001385(FP7), 100-000001310(FP8)) and the 8700G having a single part number (100-000001236).

Head-to-Head Benchmarks

The head-to-head data is one-sided, with the Ryzen 7 8700G winning all 15 benchmark comparisons. The largest margin is in PassMark physics, where the 8700G scores 1,647 against the 8645HS's 1,095, a 33.5% difference. This is followed closely by PassMark data encryption, where the 8700G scores 22,842 versus 15,588, a 31.8% lead. In PassMark data compression, the 8700G scores 386,811 versus 265,483, a 31.4% advantage. Similar margins appear in PassMark extended instructions (29,067 vs 20,003, a 31.2% delta) and PassMark random string sorting (46,025 vs 31,748, a 31% lead).

The multi-core Cinebench results show a substantial gap. In Cinebench R23 multi-core, the 8700G scores 17,128 versus 13,220 for the 8645HS, a 22.8% delta. In Cinebench R15 multi-core, the scores are 2,693 and 2,094, respectively, a 22.2% difference. The single-core margins are smaller but still favor the 8700G. In Cinebench R23 single-core, the 8700G scores 1,817 versus 1,714, a 5.7% lead. In Cinebench R15 single-core, it scores 286 versus 270, a 5.6% lead. PassMark single-thread scores are 3,928 for the 8700G and 3,653 for the 8645HS, a 7% difference.

Other PassMark tests show the 8700G ahead by roughly 27-30%. In PassMark integer math, the 8700G scores 103,107 versus 72,640, a 29.5% lead. In floating point math, it scores 63,815 versus 44,833, a 29.7% lead. In find prime numbers, the scores are 103 and 75, a 27.2% difference. Even in data encryption, the 8700G's 22,842 score outpaces the 8645HS's 15,588 by 31.8%. The 8700G also has additional 3DMark benchmarks not present for the 8645HS, including 16-thread (7,918), 8-thread (6,589), 4-thread (3,825), 2-thread (1,978), and single-thread (1,010) scores, further demonstrating its multi-threaded prowess.

Where Each One Wins

The Ryzen 7 8700G wins in every single benchmark category recorded. This makes it the definitive choice for any compute-heavy desktop application. Its 33.5% lead in physics and 31.8% lead in encryption suggest it is particularly strong in scientific simulation and cryptography tasks. The 29.5-29.7% margins in integer and floating-point math indicate robust performance in general productivity, engineering, and financial modeling workloads. The 22.8% lead in Cinebench R23 multi-core confirms its advantage in rendering and video encoding. Even in single-threaded tasks, where the 8645HS is typically more competitive, the 8700G maintains a 5.6-7% lead, meaning it is also better for legacy or lightly-threaded applications.

The Ryzen 5 8645HS has no benchmark wins in this comparison, but its wins are contextual. It is the only processor here designed for mobile platforms, with a 45-watt TDP suited for laptops. For users who need a capable CPU in a portable chassis, the 8645HS is the only viable option between these two. Its 83rd percentile ranking among all CPUs means it is still a strong performer for mobile workloads. The 8645HS also has a higher memory bandwidth at 89.6 GB/s, which could offer a slight advantage in memory-sensitive tasks if the system is configured to take advantage of it, though this is not reflected in the benchmark scores. The 8700G, by contrast, is a desktop-only part that cannot be used in mobile systems. Thus, the use-case split is simple: the 8700G wins on performance for desktop users, while the 8645HS wins on form factor for mobile users.