AMD Ryzen 5 7645HX vs AMD Ryzen 7 8700G Comparison

Head-to-Head Benchmarks

The head-to-head data shows a clear pattern: the AMD Ryzen 7 8700G dominates in multi-threaded and throughput-oriented workloads, while the AMD Ryzen 5 7645HX secures a narrow but significant win in certain single-threaded and specialized tests. Out of 17 recorded comparisons, the 8700G wins 14, while the 7645HX takes 3.

Starting with the largest margins, the Ryzen 7 8700G leads by 25.2% in PassMark random string sorting (46025 vs 34434) and by 24.9% in PassMark integer math (103107 vs 77432). The floating point math test shows a 23.5% advantage for the 8700G (63815 vs 48798), and data compression comes in 21.9% ahead (386811 vs 302256). Data encryption follows at 21.6% (22842 vs 17900), and extended instructions show a 21% gap (29067 vs 22969). These five workloads all involve sustained parallel execution, which aligns with the extra two cores and four threads on the 8700G.

In Geekbench multicore, the 8700G posts 14584 against 11586 for the 7645HX, a 20.6% difference. Cinebench R23 multicore shows an 18.4% lead (17128 vs 13985), while Cinebench R15 multicore shows 2693 vs 2276, a 15.5% gap. PassMark multithread scores 31690 vs 26476, a 16.5% difference, and PassMark physics shows 1647 vs 1497, a 9.1% lead for the 8700G.

The single-threaded picture is much closer. PassMark single thread favors the 8700G by just 0.5% (3928 vs 3907), and Cinebench R23 single core shows a 0.4% edge for the 8700G (1817 vs 1809). Cinebench R15 single core is the only Cinebench single-thread test where the 7645HX wins, by 1% (289 vs 286). The most notable single-threaded victory for the 7645HX comes in Geekbench single core, where it beats the 8700G by 13.7% (2657 vs 2337). The final win for the 7645HX is in PassMark find prime numbers, where it posts 178 against 103, a 72.8% advantage. That is the single largest percentage delta in either direction across all recorded tests.

The data indicates that the 8700G is the stronger all-around performer, especially in workloads that scale with core count. The 7645HX, however, demonstrates a notable edge in one specific single-threaded benchmark and a dominant result in prime number calculation, which likely reflects differences in how the two architectures handle that particular instruction pattern.

The Verdict

Based strictly on the recorded benchmarks, the AMD Ryzen 7 8700G is the pick for users who run multi-threaded applications, content creation tasks, compression, encryption, or any workload that benefits from eight cores and sixteen threads. Its wins span 14 of 17 tests, including all major multi-core benchmarks and most throughput tests. The 8700G also holds a slight single-thread edge in PassMark and Cinebench R23, so it is not sacrificing everyday responsiveness for its multi-core lead.

The AMD Ryzen 5 7645HX is the choice for a narrower set of scenarios. Its Geekbench single-core score of 2657 is 13.7% higher than the 8700G's 2337, which may translate to better performance in lightly threaded applications that rely on that specific benchmark's workload. The 72.8% win in PassMark find prime numbers is striking, but it is an isolated result and should not be generalized to all integer or math-heavy tasks, given that the 8700G leads integer math by 24.9% and floating point math by 23.5%.

For most users, the 8700G's breadth of wins makes it the safer recommendation. The 7645HX is only preferable if the specific Geekbench single-core pattern or prime number calculation is the dominant workload. The overall average benchmark scores are close: the 7645HX sits at 33668 with an 84th percentile ranking, while the 8700G averages 33089 and ranks at the 83rd percentile. That near parity in overall standing, despite the 8700G's head-to-head dominance, suggests the 7645HX's few wins are in tests that carry heavy weight in the aggregate scoring.

Architecture Differences

Both processors use the Zen 4 architecture from AMD, but they come from different product families and are built on different process nodes. The Ryzen 5 7645HX is part of the 7000 series, codenamed Dragon Range, and is fabricated on a 5 nm process by TSMC. The Ryzen 7 8700G belongs to the 8000 series, codenamed Phoenix, and uses a more advanced 4 nm process, also from TSMC. The transistor counts differ substantially: the 7645HX has 6,570 million transistors on a 71 mm² die, while the 8700G packs 25,000 million transistors on a 178 mm² die. That larger, denser chip likely contributes to the 8700G's higher multi-core throughput.

Cache configurations also diverge. Both processors offer 64 KB of L1 per core and 1 MB of L2 per core, but the shared L3 cache is different: the 7645HX has 32 MB shared, while the 8700G has 16 MB shared. The 7645HX's larger L3 may help in certain latency-sensitive workloads, though the benchmark data does not show a consistent advantage. The 8700G compensates with more cores and a higher boost clock.

Integrated graphics are another key architectural split. The 7645HX includes a Radeon 610M GPU, while the 8700G features a Radeon 780M. The 8700G's integrated graphics are more capable, which is expected given its desktop-oriented Phoenix design. The 7645HX, as a mobile processor, relies more on the platform's discrete GPU options.

Memory support is identical in type and bandwidth: both use DDR5 with a dual-channel bus and 83.2 GB/s of bandwidth. However, ECC memory support differs: the 7645HX supports ECC, while the 8700G does not. PCIe connectivity also differs, with the 7645HX offering Gen 5 with 28 lanes (CPU only) versus the 8700G's Gen 4 with 20 lanes (CPU only).

Specification Differences

The core and thread counts are the most obvious specification gap. The Ryzen 5 7645HX has 6 cores and 12 threads, while the Ryzen 7 8700G has 8 cores and 16 threads. Base clocks are 4.00 GHz for the 7645HX and 4.20 GHz for the 8700G. Boost clocks are 5.00 GHz and 5.10 GHz, respectively. Thermal design power differs significantly: the 7645HX is rated at 45 W, while the 8700G is rated at 65 W. That higher power envelope likely enables the 8700G's sustained multi-core performance.

The socket types are completely different. The 7645HX uses AMD Socket FL1, which is a mobile platform socket, while the 8700G uses AMD Socket AM5, a desktop socket. This is a fundamental compatibility difference: the two chips cannot be swapped into the same motherboard. Market segments reflect this: the 7645HX is classified as Mobile, and the 8700G is classified as Desktop.

The multiplier is unlocked on the 8700G, allowing overclocking, while the 7645HX has a locked multiplier. The release dates are also different, with the 7645HX launching on 2023-01-03 and the 8700G arriving on 2024-01-07. The 8700G has a launch MSRP of $329, which is recorded in the database. The 7645HX has no recorded launch MSRP. Part numbers are 100-000000872 for the 7645HX and 100-000001236 for the 8700G.

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 7645HX has 6 cores and 12 threads.

Q: What is the largest benchmark margin between the two?

A: The largest percentage difference is in PassMark find prime numbers, where the Ryzen 5 7645HX scores 178 versus 103 for the Ryzen 7 8700G, a 72.8% advantage for the 7645HX.

Q: Which chip has the higher boost clock?

A: The Ryzen 7 8700G boosts to 5.10 GHz, while the Ryzen 5 7645HX boosts to 5.00 GHz. The 8700G also has a higher base clock at 4.20 GHz versus 4.00 GHz.

Q: Do both processors support ECC memory?

A: No. The Ryzen 5 7645HX supports ECC memory, while the Ryzen 7 8700G does not.

Q: Which processor has more L3 cache?

A: The Ryzen 5 7645HX has 32 MB of shared L3 cache, while the Ryzen 7 8700G has 16 MB of shared L3 cache.

Q: What are the PCIe specifications for each chip?

A: The Ryzen 5 7645HX supports PCIe Gen 5 with 28 lanes (CPU only), while the Ryzen 7 8700G supports PCIe Gen 4 with 20 lanes (CPU only).

Where Each One Wins

The Ryzen 7 8700G wins in nearly every multi-threaded and throughput-oriented benchmark. It leads in Cinebench R15 multicore (2693 vs 2276), Cinebench R23 multicore (17128 vs 13985), Geekbench multicore (14584 vs 11586), and PassMark multithread (31690 vs 26476). It also wins all PassMark workloads except find prime numbers, including data compression, data encryption, extended instructions, floating point math, integer math, physics, random string sorting, and single thread. Its wins in Cinebench R23 single core and PassMark single thread are narrow but consistent. Users running rendering, video encoding, compression, encryption, or physics simulations should favor the 8700G.

The Ryzen 5 7645HX wins in three specific tests. The Geekbench single-core result (2657 vs 2337) is a substantial 13.7% margin, making it the preferred chip for applications that mirror that benchmark's single-threaded workload. The PassMark find prime numbers result (178 vs 103) is a 72.8% blowout, though it is an isolated metric. The Cinebench R15 single-core win (289 vs 286) is marginal at 1%. The 7645HX also has the advantage of a lower 45 W TDP versus 65 W for the 8700G, which matters in mobile or power-constrained environments. Its larger 32 MB L3 cache and ECC memory support are additional differentiators, though these do not show up directly in the benchmark scores. For users prioritizing Geekbench single-core performance or prime number calculation, the 7645HX is the data-backed choice.