AMD Ryzen 5 7645HX vs AMD Ryzen AI 7 350 Comparison

The AMD Ryzen AI 7 350 and AMD Ryzen 5 7645HX are both mobile processors, but they represent two distinct design philosophies from AMD. The Ryzen AI 7 350 is a newer, efficiency-focused chip built on the Zen 5 architecture, while the Ryzen 5 7645HX is a higher-power, performance-oriented part from the Zen 4 generation. Benchmark data reveals a split decision: the Ryzen AI 7 350 dominates in multi-threaded rendering and integer workloads, while the Ryzen 5 7645HX counters with significant wins in single-threaded Geekbench, cryptography, and prime number calculations. The two chips also differ in core counts, power envelopes, cache sizes, and platform features, making the choice between them a matter of workload priority.

Head-to-Head Benchmarks

The most decisive victory for the AMD Ryzen AI 7 350 comes in Cinebench R23 multi-core, where it scores 16014.5 against the Ryzen 5 7645HX’s 13985, a 14.5% lead. This is the largest margin of any benchmark in the comparison and highlights the benefit of the Ryzen AI 7 350’s two additional cores and Zen 5 architecture. The gap narrows in Cinebench R15 multi-core, but the Ryzen AI 7 350 still wins by 8.8% (2477 vs 2276). Single-core Cinebench results also favor the Ryzen AI 7 350, with an 8.2% advantage in R23 (1958 vs 1809) and a smaller 1.7% edge in R15 (294 vs 289).

The Ryzen AI 7 350 also excels in math-heavy Passmark tests. It posts a 10.6% win in integer math (85651 vs 77432) and a 9.1% win in floating-point math (53230 vs 48798). These results suggest that the newer Zen 5 cores are more efficient at executing arithmetic operations per clock. Data compression is a near tie, with the Ryzen AI 7 350 scoring 304089 versus 302256, a negligible 0.6% difference. Geekbench multi-core is similarly close, with the Ryzen AI 7 350 taking a 0.8% win (11676 vs 11586).

However, the Ryzen 5 7645HX fights back decisively in other areas. The largest single win for the Ryzen 5 7645HX is in Passmark’s find prime numbers test, where it scores 178 versus 80, a massive 55.1% advantage. This indicates a significant difference in how the two chips handle this specific workload, likely due to clock speed and architecture trade-offs. The Ryzen 5 7645HX also wins Geekbench single-core by 18.6% (2657 vs 2164), a surprising reversal given the Cinebench single-core results. Another notable win is in data encryption, where the Ryzen 5 7645HX leads by 14.8% (17900 vs 15244).

The Ryzen 5 7645HX continues to lead in several other Passmark subtests. It wins Passmark multi-thread by 5.8% (26476 vs 24935) and physics by 9.9% (1497 vs 1349). Random string sorting goes to the Ryzen 5 7645HX by 3.4% (34434 vs 33266), and extended instructions by 5.6% (22969 vs 21678). Single-thread Passmark scores are close, with the Ryzen 5 7645HX winning by 1.9% (3907 vs 3834). Overall, the Ryzen AI 7 350 wins 8 benchmarks, while the Ryzen 5 7645HX wins 9, indicating a remarkably balanced matchup where the victor depends entirely on the workload.

FAQ

Q: Which processor is faster in Cinebench R23 multi-core?

A: The AMD Ryzen AI 7 350 is significantly faster, scoring 16014.5 versus 13985 for the Ryzen 5 7645HX, a 14.5% advantage.

Q: Does the Ryzen 5 7645HX have any major wins?

A: Yes, it has several. Its most dominant win is in Passmark’s find prime numbers test, where it leads by 55.1%. It also wins Geekbench single-core by 18.6% and data encryption by 14.8%.

Q: What is the difference in average benchmark scores?

A: The Ryzen AI 7 350 has an average benchmark score of 34222, while the Ryzen 5 7645HX scores 33668. Both chips rank in the 84th percentile of all CPUs.

Q: How do the two chips compare in floating-point math?

A: The Ryzen AI 7 350 leads in Passmark floating-point math with a score of 53230, which is 9.1% higher than the Ryzen 5 7645HX’s 48798.

Q: Which chip has a higher clock speed?

A: Both have the same boost clock of 5.00 GHz. However, the Ryzen 5 7645HX has a higher base clock of 4.00 GHz compared to the Ryzen AI 7 350’s 2.00 GHz.

Q: Are there any benchmarks where the two are nearly identical?

A: Yes, in Passmark data compression, the Ryzen AI 7 350 scores 304089 against 302256 for the Ryzen 5 7645HX, a difference of just 0.6%. Geekbench multi-core is also close, with a 0.8% gap.

The Verdict

The data suggests a clear split based on workload. For users prioritizing multi-threaded rendering and general math performance, the AMD Ryzen AI 7 350 is the stronger choice. Its 14.5% lead in Cinebench R23 multi-core and 10.6% lead in Passmark integer math are substantial and will translate to faster video encoding, 3D rendering, and compilation tasks. The 8.8% win in Cinebench R15 multi-core reinforces this trend.

Conversely, the AMD Ryzen 5 7645HX is the pick for users who depend on single-threaded performance in specific legacy benchmarks or cryptography. Its 18.6% win in Geekbench single-core is the largest single-core margin in the entire comparison, and its 14.8% lead in data encryption is significant for security-related workloads. The 55.1% advantage in find prime numbers is an outlier but shows the Ryzen 5 7645HX’s ability in that specific calculation type.

For general-purpose use, the Ryzen AI 7 350’s wins in Cinebench and math tests are more broadly applicable to modern software. However, the Ryzen 5 7645HX counters with a win in Passmark multi-thread and physics, indicating it is not a slouch in multi-threaded tasks either. The final decision should be guided by the specific applications that will be run most often. The Ryzen AI 7 350 is the better all-rounder for creative and productivity workloads, while the Ryzen 5 7645HX is superior in single-threaded and encryption-heavy scenarios.

Specification Differences

The two processors diverge on core configuration and power. The AMD Ryzen AI 7 350 has 8 cores and 16 threads, while the AMD Ryzen 5 7645HX has 6 cores and 12 threads. The Ryzen AI 7 350 has a TDP of 28 watts, compared to the Ryzen 5 7645HX’s 45 watts, indicating the latter is designed for higher sustained power draw. Base clocks differ significantly, with the Ryzen 5 7645HX running at 4.00 GHz versus the Ryzen AI 7 350’s 2.00 GHz, though both boost to 5.00 GHz.

The socket and platform also differ. The Ryzen AI 7 350 uses AMD Socket FP8, while the Ryzen 5 7645HX uses AMD Socket FL1. Memory support is another distinction: the Ryzen AI 7 350 supports both DDR5 and LPDDR5X, while the Ryzen 5 7645HX only supports DDR5. The Ryzen 5 7645HX offers ECC memory support, which the Ryzen AI 7 350 lacks. PCIe connectivity is different as well, with the Ryzen AI 7 350 featuring Gen 4 with 16 lanes, while the Ryzen 5 7645HX features Gen 5 with 28 lanes. The integrated graphics differ, with the Ryzen AI 7 350 featuring a Radeon 860M and the Ryzen 5 7645HX featuring a Radeon 610M.

Architecture Differences

The architectural split is the root of the performance differences. The AMD Ryzen AI 7 350 is built on the Zen 5 architecture and uses the codename Krackan Point, while the AMD Ryzen 5 7645HX uses the older Zen 4 architecture with the codename Dragon Range. The Ryzen AI 7 350 is fabricated on a 4 nm process at TSMC, compared to the Ryzen 5 7645HX’s 5 nm process. The Ryzen 5 7645HX has a substantially larger L3 cache at 32 MB shared, versus the Ryzen AI 7 350’s 8 MB. L1 cache is also larger per core on the Ryzen AI 7 350 (80 KB per core) versus the Ryzen 5 7645HX (64 KB per core), while L2 cache is identical at 1 MB per core. The Ryzen 5 7645HX is the only one with a published transistor count of 6,570 million and a die size of 71 mm², while the Ryzen AI 7 350 has a die size of 195 mm². The Ryzen AI 7 350 is part of the Ryzen AI 300 generation, while the Ryzen 5 7645HX is a 7000 series part. These differences explain why the newer, more efficient Zen 5 chip can match or beat the older chip despite a lower base clock and TDP, and why the older chip excels in certain single-threaded tasks.