AMD Ryzen 5 8400F vs AMD Ryzen Embedded 9900X Comparison

The AMD Ryzen 5 8400F and AMD Ryzen Embedded 9900X are both AM5 desktop-class AMD parts, but the database treats them very differently. The 8400F is a 6-core, 12-thread Zen 4 chip with a full set of recorded benchmark results, an average benchmark score of 25005, and a 77th percentile ranking among all CPUs. The 9900X is a 12-core, 24-thread Zen 5 chip with no recorded benchmark scores, an average benchmark score of 0, and a listed 50th percentile. This makes the comparison asymmetric: one CPU has measured performance evidence, the other has only a specification profile.

Head-to-Head Benchmarks

The database records no head-to-head benchmark results between these two CPUs. Neither CPU has a direct win against the other in a shared test. All measured benchmark data in this comparison belongs to the AMD Ryzen 5 8400F.

The 8400F’s 3DMark results scale from 951 in the single-thread test to 6165 in the max-thread test. Intermediate results include 1874 in the 2-thread test, 3563 in the 4-thread test, 5275 in the 8-thread test, and 6091 in the 16-thread test. Cinebench results follow the same pattern: R15 multicore scores 2101, R15 singlecore scores 296, R20 multicore scores 8757, R20 singlecore scores 1236, R23 multicore scores 20851, and R23 singlecore scores 2943.

PassMark results are also present for the 8400F. The data shows 288158 in data compression, 16646 in data encryption, 22175 in extended instructions, 89 in find prime numbers, 46217 in floating point math, 74021 in integer math, 24389 in multithread, 1332 in physics, 34604 in random string sorting, and 3685 in single-thread testing. These scores form the only measured benchmark evidence in this pairing.

The nearest-rival data gives additional context for the 8400F. Its average score of 25005 is 0.2% above the AMD Ryzen 5 7500F, which scores 24964. It is 0.3% above the Intel Core i7-11850H at 24935 and 0.4% above the Intel Core i7-13620H at 24911. It sits 0.4% below the AMD EPYC 9474F, which scores 25103. These are narrow margins, indicating that the 8400F is closely grouped with its nearest measured competitors.

Because the 9900X has no recorded benchmark scores, its performance cannot be placed into the same measured framework. The head-to-head section of the database is therefore empty, and the only numbers available for comparison are the 8400F’s standalone results.

Architecture Differences

The two CPUs use the same 4 nm TSMC process, but their internal designs are different. The Ryzen 5 8400F is a Zen 4 part from the Phoenix codename family, with a 178 mm² die and 25,000 million transistors. The Ryzen Embedded 9900X is a Zen 5 part from the Granite Ridge codename family, using two 70.6 mm² dies and 16,630 million transistors.

The 9900X delivers more compute resources despite the lower transistor count. It has 12 cores and 24 threads, while the 8400F has 6 cores and 12 threads. Clock speeds also favor the 9900X: 4.40 GHz base and 5.60 GHz boost versus 4.20 GHz base and 4.70 GHz boost. The 9900X carries a 120 W TDP, while the 8400F is rated at 65 W.

Cache organization differs as well. The 8400F has 64 KB of L1 cache per core and 16 MB of shared L3 cache. The 9900X has 80 KB of L1 cache per core and 64 MB of L3 cache. Both CPUs use 1 MB of L2 cache per core, and both use dual-channel DDR5 memory. Memory bandwidth is higher on the 9900X at 89.6 GB/s, compared with 83.2 GB/s on the 8400F.

Platform features separate the two more clearly. The 9900X supports ECC memory, while the 8400F does not. The 9900X uses PCIe Gen 5 with 24 lanes, while the 8400F uses PCIe Gen 4 with 20 lanes. The 9900X includes Radeon Graphics, while the 8400F lists no integrated graphics. Both CPUs are unlocked, both are active production parts, and both use AMD Socket AM5.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen Embedded 9900X has 12 cores and 24 threads. The AMD Ryzen 5 8400F has 6 cores and 12 threads.

Q: Are both CPUs built on the same manufacturing process?

A: Yes. Both are built on a 4 nm process from TSMC.

Q: Does the Ryzen Embedded 9900X support ECC memory?

A: Yes. ECC memory support is listed as true for the 9900X, while the 8400F is listed as false.

Q: Does the Ryzen 5 8400F have integrated graphics?

A: No. The 8400F lists integrated graphics as N/A. The Ryzen Embedded 9900X includes Radeon Graphics.

Q: What is the average benchmark score of the Ryzen 5 8400F?

A: The 8400F has an average benchmark score of 25005, placing it at the 77th percentile of all CPUs in the database. The 9900X has no recorded benchmark scores.

Q: What percentile does the Ryzen Embedded 9900X hold?

A: The database lists the 9900X at the 50th percentile of all CPUs, but no benchmark scores are recorded for it.

Specification Differences

The following table lists the recorded specifications where the two CPUs differ.

| Specification | AMD Ryzen 5 8400F | AMD Ryzen Embedded 9900X |

|---|---|---|

| Series | 8000 series | 9000 series |

| Cores | 6 | 12 |

| Threads | 12 | 24 |

| Base clock | 4.20 GHz | 4.40 GHz |

| Boost clock | 4.70 GHz | 5.60 GHz |

| TDP | 65 W | 120 W |

| Generation | Ryzen 5 (Zen 4 (Phoenix)) | Ryzen Embedded (Zen 5 (Granite Ridge)) |

| Codename | Phoenix | Granite Ridge |

| Transistors | 25,000 million | 16,630 million |

| Die size | 178 mm² | 2x 70.6 mm² |

| L1 cache per core | 64 KB | 80 KB |

| L3 cache | 16 MB shared | 64 MB |

| Memory bandwidth | 83.2 GB/s | 89.6 GB/s |

| ECC memory | No | Yes |

| PCIe | Gen 4, 20 lanes | Gen 5, 24 lanes |

| Integrated graphics | N/A | Radeon Graphics |

| Release date | 2024-03-31 | 2025-10-06 |

| Part number | 100-000001591 | 100-000000662E |

| Recorded benchmark scores | Present | None |

| Average benchmark score | 25005 | 0 |

| Percentile of all CPUs | 77 | 50 |

One additional recorded difference is launch MSRP: the 8400F had a launch MSRP of $170.

The Verdict

The recorded data supports an asymmetric verdict. The Ryzen 5 8400F is the only CPU in this pair with measured benchmark results. Its average score of 25005 and 77th percentile ranking give it a concrete performance position. The Ryzen Embedded 9900X has no recorded benchmark scores, so the database cannot verify its performance position; its listed 50th percentile is not supported by any recorded test result.

For selection based on measured performance, the 8400F is the only supported choice. For selection based on listed specifications, the 9900X is the stronger part: 12 cores, 24 threads, a 4.40 GHz base clock, a 5.60 GHz boost clock, 64 MB of L3 cache, 89.6 GB/s memory bandwidth, ECC memory support, PCIe Gen 5 with 24 lanes, and Radeon Graphics. The 8400F counters with a 65 W TDP, a 4 nm Zen 4 design, and a complete benchmark record.

Where Each One Wins

The Ryzen 5 8400F wins in benchmark coverage because it is the only CPU with scores. Its Cinebench R23 multicore result of 20851, Cinebench R23 singlecore result of 2943, PassMark multithread result of 24389, and 3DMark max-thread result of 6165 provide the only measured performance data in this comparison. Its nearest-rival margins are narrow: 0.2% above the Ryzen 5 7500F, 0.3% above the Core i7-11850H, 0.4% above the Core i7-13620H, and 0.4% below the EPYC 9474F.

The Ryzen Embedded 9900X wins on specification counts. It has more cores, more threads, higher base and boost clocks, more L3 cache, higher memory bandwidth, ECC memory support, PCIe Gen 5 with more lanes, and integrated Radeon Graphics. Its 120 W TDP is higher than the 8400F’s 65 W TDP. Use-case separation follows directly from that split: the 8400F is the part with verified measured results, while the 9900X is the part with the larger specification sheet and no recorded benchmark data.