AMD Ryzen 5 8400F vs AMD Ryzen 9 6900HS Comparison

Head-to-Head Benchmarks

The head-to-head results paint a fascinating split between these two AMD processors. The Ryzen 9 6900HS, a mobile chip, wins 8 of the 21 recorded comparisons, while the Ryzen 5 8400F, a desktop chip, takes 13. The margin of victory tells the real story. In multi-threaded workloads, the Ryzen 9 6900HS shows its core advantage. The 3dmark_16_threads test shows the 6900HS scoring 6963 against 6091 for the 8400F, a 14.3% lead. The 3dmark_8_threads result is similar, with the 6900HS ahead by 10.5% (5830 versus 5275). The 3dmark_max_threads benchmark extends this pattern, with the 6900HS winning by 12.8% (6955 versus 6165).

The Ryzen 5 8400F strikes back decisively in single-threaded and lightly-threaded tests. The cinebench_r23_singlecore score is particularly stark: the 8400F scores 2943, beating the 6900HS's 1554 by 47.2%. The cinebench_r15_singlecore test shows a similar gap, with the 8400F ahead by 17.2% (296 versus 245). The passmark_single_thread test confirms this trend, with the 8400F winning by 12.2% (3685 versus 3237). Even in the 2-thread and 4-thread 3dmark tests, the 8400F wins modestly, by 6% and 3.8% respectively.

The most dramatic divergence appears in cinebench_r23_multicore. Here, the 8400F scores 20851, which is 35.5% higher than the 6900HS's 13445. This is a massive gap, and it is noteworthy that the 8400F wins this multi-core test despite having 6 cores and 12 threads, versus the 6900HS's 8 cores and 16 threads. The data suggests that the 8400F's architectural efficiency and higher clock speeds overcome the core count disadvantage in this particular workload. The passmark_multithread test behaves differently, with the 8400F winning by a smaller 5.1% margin (24389 versus 23152).

Other workload-specific results show a mixed bag. The 6900HS wins passmark_integer_math by 16.8%, passmark_data_encryption by 10%, and passmark_floating_point_math by 4.4%. The 8400F wins passmark_extended_instructions by 9.7%, passmark_find_prime_numbers by 34.8%, passmark_physics by 21.8%, and passmark_random_string_sorting by 11.8%. The passmark_data_compression test is nearly a tie, with the 6900HS winning by 1.6%. The overall picture is that the 6900HS dominates when all cores are hammered with certain types of integer and encryption work, while the 8400F is superior for single-threaded responsiveness, physics calculations, and the specific instruction patterns in extended instruction tests.

Where Each One Wins

The data suggests the Ryzen 9 6900HS is the stronger choice for workloads that leverage many threads simultaneously and rely on high throughput for integer and floating-point math. The 16.8% lead in passmark_integer_math and the 4.4% lead in passmark_floating_point_math indicate that the 6900HS is well-suited for scientific computing, data processing, and possibly encoding tasks that use these instruction types. The 10% advantage in passmark_data_encryption points to a measurable edge in security-related and cryptographic workloads. The wins in 3dmark_8_threads and 3dmark_16_threads suggest that the 6900HS handles parallel rendering tasks or game workloads that can utilize many threads with greater efficiency.

The Ryzen 5 8400F is the clear winner for single-threaded performance and workloads that depend on it. The 47.2% gap in cinebench_r23_singlecore is enormous. This translates to faster responsiveness in applications that are not well-parallelized, such as older games, spreadsheets, and certain productivity tools. The 21.8% win in passmark_physics is interesting, as physics calculations in games and simulations often rely on a smaller number of threads. The 11.8% win in passmark_random_string_sorting suggests the 8400F handles sorting algorithms and data manipulation tasks that are not easily parallelized with greater speed. The 34.8% win in passmark_find_prime_numbers further emphasizes the single-thread advantage, as this test is often a good proxy for per-core speed.

The cinebench_r23_multicore score is a significant outlier. The 8400F wins this test by 35.5%, which is a massive margin. This is the only major multi-core test where the 8400F wins, and it does so decisively. This could indicate that the 8400F's Zen 4 architecture is more efficient at sustaining high clocks across all cores for extended periods, or that the specific test is more optimized for the newer architecture. It is a key data point that suggests the 8400F is not just a single-threaded champion, but can also dominate in certain render workloads.

The Verdict

The recorded data leads to a clear conclusion: these are two different processors for two different jobs. The AMD Ryzen 9 6900HS is the choice for users who prioritize multi-threaded performance in a mobile form factor. Its wins in the 3dmark multi-thread tests, passmark_integer_math, and passmark_floating_point_math make it a compelling option for content creation, 3D modeling, and any workload that can take advantage of its 8 cores and 16 threads. The 6900HS also holds its own in data compression and encryption, making it a balanced performer for a laptop that needs to handle a mix of heavy tasks.

The AMD Ryzen 5 8400F is the choice for users who prioritize single-threaded speed and lighter, more responsive workloads. The 47.2% lead in cinebench_r23_singlecore is a massive differentiator. This processor will feel faster in day-to-day use, gaming, and applications that are not fully multi-threaded. Its surprising win in cinebench_r23_multicore by 35.5% also makes it a compelling option for certain types of rendering work, even though it has fewer cores. The 8400F is the more versatile choice for a desktop user who wants a fast, modern CPU that excels in most common tasks, but is not a top performer in all heavy multi-threaded applications.

The data does not indicate a single "best" processor. The 6900HS is a mobile part with a 35W TDP, while the 8400F is a desktop part with a 65W TDP. Their roles are fundamentally different. The benchmark scores should be interpreted within the intended use case. For a user building a desktop PC, the 8400F is the logical choice. For a user looking at a high-end laptop, the 6900HS is the relevant option. The results show that the 8400F has a significant single-thread advantage, but the 6900HS's higher core count gives it a lead in several multi-thread benchmarks.

FAQ

Q: Which processor is faster in single-threaded tasks?

A: The AMD Ryzen 5 8400F is significantly faster. It wins the cinebench_r23_singlecore test by 47.2% (2943 versus 1554) and the passmark_single_thread test by 12.2% (3685 versus 3237).

Q: Which processor wins in multi-threaded workloads?

A: The result is mixed. The Ryzen 9 6900HS wins in several tests like 3dmark_16_threads (14.3% lead) and passmark_integer_math (16.8% lead). However, the Ryzen 5 8400F wins the cinebench_r23_multicore test by a substantial 35.5% (20851 versus 13445).

Q: What is the difference in core and thread counts?

A: The Ryzen 9 6900HS has 8 cores and 16 threads. The Ryzen 5 8400F has 6 cores and 12 threads.

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

A: Yes, the passmark_data_compression test shows a very small difference. The 6900HS scores 292842, while the 8400F scores 288158, a delta of only 1.6%.

Q: Do both processors support the same memory type?

A: Yes, both support DDR5 memory and are dual-channel. The 8400F has a higher memory bandwidth at 83.2 GB/s, compared to the 6900HS's 76.8 GB/s.

Q: What is the difference in their production status?

A: Both are listed as "Active" in the database. The 8400F has a release date of 2024-03-31, while the 6900HS has no recorded release date.

Architecture Differences

The architectural differences are significant and explain the performance split. The Ryzen 9 6900HS is built on the Zen 3+ architecture, codenamed Rembrandt, and is manufactured on a 6 nm process at TSMC. The Ryzen 5 8400F uses the newer Zen 4 architecture, codenamed Phoenix, and is built on a more advanced 4 nm process, also at TSMC. The 4 nm process allows the 8400F to achieve higher clock speeds and better power efficiency per core.

The die size also differs. The 6900HS has a die size of 208 mm², while the 8400F is smaller at 178 mm². The 8400F has a recorded transistor count of 25,000 million, while the 6900HS does not have a recorded transistor count. The smaller die and newer process for the 8400F contribute to its higher boost clock of 4.70 GHz, compared to the 6900HS's 4.90 GHz. The base clock is where the difference is most dramatic: the 8400F has a base clock of 4.20 GHz, while the 6900HS is much lower at 3.30 GHz. This higher base clock is a major reason for the 8400F's single-threaded dominance.

The cache hierarchy is also different. Both share the same 64 KB of L1 cache per core and the same 16 MB of shared L3 cache. However, the L2 cache differs. The 6900HS has 512 KB of L2 cache per core, while the 8400F has 1 MB of L2 cache per core. This doubled L2 cache likely contributes to the 8400F's advantage in the passmark_extended_instructions and other latency-sensitive tasks.

The integrated graphics are a major difference. The 6900HS includes a Radeon 680M integrated GPU, while the 8400F has no integrated graphics (N/A). This makes the 8400F a CPU only, necessitating a discrete graphics card. The 6900HS is a more self-contained mobile solution.

The socket and market segment also differ. The 6900HS uses the AMD Socket FP7 and is in the mobile segment. The 8400F uses the AMD Socket AM5 and is a desktop part. The 6900HS is not multiplier unlockable, while the 8400F is multiplier unlocked, meaning the 8400F can be overclocked.

Specification Differences

The two processors differ in several key specifications that are listed in the database. The most obvious difference is in the core and thread counts. The 6900HS has 8 cores and 16 threads, while the 8400F has 6 cores and 12 threads. The base clock is also very different: the 6900HS has a base clock of 3.30 GHz, while the 8400F has a base clock of 4.20 GHz. The boost clock is higher on the 6900HS at 4.90 GHz, compared to the 8400F's 4.70 GHz.

The thermal design power (TDP) is a significant differentiator. The 6900HS is a mobile chip with a TDP of 35W, while the 8400F is a desktop chip with a TDP of 65W. This reflects the different power envelopes of the mobile and desktop segments. The socket is different as well: the 6900HS uses AMD Socket FP7, and the 8400F uses AMD Socket AM5.

The process node, architecture, codename, and generation also differ. The 6900HS is on Zen 3+ (Rembrandt) and a 6 nm process, while the 8400F is on Zen 4 (Phoenix) and a 4 nm process. The die size is slightly larger on the 6900HS (208 mm²) than the 8400F (178 mm²). The 8400F has a recorded 25,000 million transistors, while the 6900HS has no such recorded figure. The L2 cache per core is double on the 8400F (1 MB) versus the 6900HS (512 KB). The memory bandwidth is higher on the 8400F (83.2 GB/s) than the 6900HS (76.8 GB/s). The integrated graphics also differ: the 6900HS has a Radeon 680M, while the 8400F has N/A. The market segment is different, with the 6900HS in mobile and the 8400F in desktop. The 8400F has a launch MSRP of $170 and a release date of 2024-03-31, while the 6900HS has no recorded release date or MSRP. The multiplier is unlocked on the 8400F, but not on the 6900HS.