AMD Ryzen 9 6900HX vs AMD Ryzen AI 5 340 Comparison

The AMD Ryzen 9 6900HX and AMD Ryzen AI 5 340 are two very different mobile processors that land in the same performance tier. The benchmark data shows the 6900HX, an 8-core Zen 3+ part, wins 12 of 17 head-to-head comparisons, while the 6-core Zen 5-based Ryzen AI 5 340 takes 5 wins, primarily in single-threaded workloads. The overall average benchmark scores are nearly identical — 26274 for the 6900HX versus 25981 for the AI 5 340 — and both sit at the 78th percentile among all CPUs, making the choice entirely dependent on workload priority.

Head-to-Head Benchmarks

The Ryzen 9 6900HX dominates multi-threaded and throughput-oriented tests with decisive margins. In PassMark integer math, it scores 89388 versus 63078 for the AI 5 340, a 41.7% advantage. Data encryption shows an even larger gap: 19118 versus 11470, a 66.7% lead for the 6900HX. Data compression follows the same pattern, with the 6900HX scoring 306184 against 229796, a 33.2% advantage. Random string sorting also favors the 6900HX, at 32037 versus 24970, a 28.3% difference.

The 6900HX also wins the primary multi-core rendering benchmarks. In Cinebench R23 multi-core, it scores 13497 versus 12532, a 7.7% lead. Cinebench R15 multi-core shows a larger margin: 2231 versus 1915, a 16.5% advantage. Geekbench multi-core follows with 9850 versus 9165, a 7.5% edge. PassMark multi-threaded performance is also higher on the 6900HX, at 24346 versus 19506, a 24.8% difference. Floating-point math favors the 6900HX as well, 49981 versus 39967, a 25.1% lead. Extended instruction performance is 26.8% higher on the 6900HX, at 20849 versus 16440. Physics scores are close but still favor the 6900HX: 1153 versus 1095, a 5.3% difference.

The Ryzen AI 5 340 counters with clear wins in single-threaded tests. Cinebench R23 single-core is its strongest result: 1915.5 versus 1558 for the 6900HX, an 18.7% advantage. Geekbench single-core also favors the AI 5 340, at 2140 versus 1881, a 12.1% lead. PassMark single-thread shows a 7.4% edge for the AI 5 340, at 3683 versus 3409. The AI 5 340 also wins PassMark find prime numbers, scoring 72 versus 63, a 12.5% advantage. The only multi-core win for the AI 5 340 is narrow: Cinebench R15 single-core goes to the 6900HX at 249 versus 242.6, a 2.6% margin.

Where Each One Wins

The Ryzen 9 6900HX is the clear choice for compute-heavy, multi-threaded workloads. Its wins in integer math, data encryption, and data compression indicate strong performance for productivity tasks that involve number crunching or file handling. The 41.7% lead in integer math and the 66.7% lead in data encryption are the largest advantages in the entire comparison, suggesting the 6900HX is particularly well-suited for encryption, compression, and general CPU-intensive processing. The 33.2% advantage in data compression reinforces this, making it the better option for archiving or database workloads. Its 24.8% lead in PassMark multi-threaded performance and 16.5% lead in Cinebench R15 multi-core also point to better sustained throughput in rendering or encoding scenarios.

The Ryzen AI 5 340 wins where single-thread performance matters most. Its 18.7% lead in Cinebench R23 single-core and 12.1% lead in Geekbench single-core show a notable architectural advantage in lightly-threaded tasks. This makes it the better pick for everyday responsiveness, application launch times, and software that relies on a single primary thread. The 7.4% lead in PassMark single-thread and the 12.5% win in prime number finding further confirm that the AI 5 340 excels at tasks that cannot utilize many cores. For users who prioritize snappy single-threaded performance over raw multi-core throughput, the AI 5 340 is the stronger candidate.

FAQ

Q: Which processor has the higher multi-core performance?

A: The AMD Ryzen 9 6900HX. It wins all multi-core benchmarks, including Cinebench R23 multi-core (13497 versus 12532, a 7.7% lead), Geekbench multi-core (9850 versus 9165, a 7.5% lead), and PassMark multi-threaded (24346 versus 19506, a 24.8% lead).

Q: Which processor is better for single-threaded tasks?

A: The AMD Ryzen AI 5 340. It wins Cinebench R23 single-core (1915.5 versus 1558, an 18.7% advantage), Geekbench single-core (2140 versus 1881, a 12.1% advantage), and PassMark single-thread (3683 versus 3409, a 7.4% advantage).

Q: How do their overall benchmark averages compare?

A: The Ryzen 9 6900HX has an average benchmark score of 26274, while the Ryzen AI 5 340 averages 25981. Both processors are at the 78th percentile among all CPUs.

Q: What is the largest performance gap in the comparison?

A: The largest gap is in PassMark data encryption, where the Ryzen 9 6900HX scores 19118 versus 11470 for the AI 5 340, a 66.7% difference.

Q: Are there any benchmarks where the Ryzen AI 5 340 wins by a wide margin?

A: Yes, Cinebench R23 single-core is its biggest win, where it scores 1915.5 versus 1558, an 18.7% advantage. It also leads Geekbench single-core by 12.1%.

Q: Do both processors have the same core count?

A: No. The Ryzen 9 6900HX has 8 cores and 16 threads, while the Ryzen AI 5 340 has 6 cores and 12 threads.

Specification Differences

The Ryzen 9 6900HX and Ryzen AI 5 340 differ across nearly all core specifications. The 6900HX has 8 cores and 16 threads, whereas the AI 5 340 has 6 cores and 12 threads. Base clocks differ significantly: the 6900HX runs at 3.30 GHz, while the AI 5 340 runs at 2.00 GHz. Boost clocks are closer, with the 6900HX at 4.90 GHz and the AI 5 340 at 4.80 GHz. Thermal design power is also different: the 6900HX is rated at 45 W, while the AI 5 340 is rated at 28 W.

Cache configurations diverge as well. The 6900HX has 64 KB of L1 cache per core, 512 KB of L2 cache per core, and 16 MB of shared L3 cache. The AI 5 340 has 80 KB of L1 per core, 1 MB of L2 per core, and 8 MB of L3 cache. Memory support differs, with the 6900HX supporting DDR5 and the AI 5 340 supporting DDR5 and LPDDR5X. Memory bandwidth is higher on the AI 5 340 at 89.6 GB/s versus 76.8 GB/s for the 6900HX.

The processors use different sockets: the 6900HX uses AMD Socket FP7, while the AI 5 340 uses AMD Socket FP8. PCIe lanes also differ, with the 6900HX offering 20 lanes and the AI 5 340 offering 16 lanes. The 6900HX has an unlocked multiplier, while the AI 5 340 does not. The integrated graphics differ as well: the 6900HX features the Radeon 680M, while the AI 5 340 features the Radeon 840M.

Architecture Differences

Architecturally, these are two distinct generations. The Ryzen 9 6900HX is based on the Zen 3+ architecture, codenamed Rembrandt, and belongs to the 6000 series. It is manufactured on a 6 nm process at TSMC, with a die size of 208 mm². The Ryzen AI 5 340 uses the Zen 5 architecture, codenamed Krackan Point, and belongs to the Ryzen AI 300 generation, which includes a mix of Zen 5 and Zen 5c cores. It is manufactured on a 4 nm process at TSMC, with a slightly smaller die size of 195 mm².

The process node difference gives the AI 5 340 a manufacturing advantage, but the 6900HX compensates with more physical cores and higher clock speeds. The cache hierarchy also reflects the architectural shift. The AI 5 340 has a larger L1 cache per core (80 KB versus 64 KB) and a larger L2 cache per core (1 MB versus 512 KB), but half the L3 cache (8 MB versus 16 MB). The 6900HX also supports additional PCIe lanes (20 versus 16) despite being on an older architecture. The AI 5 340 has a higher memory bandwidth rating (89.6 GB/s versus 76.8 GB/s) and supports LPDDR5X in addition to DDR5, which the 6900HX does not.

The integrated graphics differ, with the 6900HX using the Radeon 680M and the AI 5 340 using the Radeon 840M. The release date for the AI 5 340 is January 5, 2025, while no release date is listed for the 6900HX. The 6900HX has an unlocked multiplier, indicating overclocking capability, while the AI 5 340 is locked. Both are active production parts and target the mobile market segment.

The Verdict

The data points to a clear split: choose the Ryzen 9 6900HX for maximum multi-threaded throughput, and the Ryzen AI 5 340 for superior single-threaded performance. The 6900HX wins 12 of 17 head-to-head tests, and its wins are often decisive — 66.7% in data encryption, 41.7% in integer math, and 33.2% in data compression. These margins are substantial and indicate that any workload which scales across cores will run noticeably faster on the 6900HX. Its 8-core, 16-thread configuration, combined with a 3.30 GHz base clock and 4.90 GHz boost clock, provides the raw resources needed for heavy parallel processing. The 45 W TDP suggests it is designed for performance-oriented laptops that can handle higher power draw.

The Ryzen AI 5 340 is the better choice when single-threaded speed is the priority. Its 18.7% lead in Cinebench R23 single-core and 12.1% lead in Geekbench single-core are meaningful for applications that rely on one or two threads. The 2.00 GHz base clock is low, but the 4.80 GHz boost clock, combined with the Zen 5 architecture, delivers superior per-thread performance. The 28 W TDP also indicates better efficiency, making it suitable for thinner, lighter machines. Its 6-core, 12-thread configuration is still capable for multi-threaded tasks, as shown by its respectable Cinebench R23 multi-core score of 12532, but it trails the 6900HX by 7.7% in that test.

For users who need a mobile workstation for rendering, compiling, or data-heavy workloads, the Ryzen 9 6900HX is the clear winner. For users who prioritize snappy single-threaded responsiveness and efficiency, the Ryzen AI 5 340 is the better fit. The nearly identical overall average scores and identical 78th percentile ranking mean neither processor is universally faster; the right pick depends entirely on the workload mix.