AMD Ryzen 5 8400F vs AMD Ryzen 7 5825U Comparison

Where Each One Wins

The benchmark data delivers a clear verdict: the AMD Ryzen 5 8400F wins every single head-to-head comparison recorded in the database, 15 out of 15. The Ryzen 7 5825U does not secure a single victory in any measured workload. This is not a close contest; the desktop part dominates across the board.

Looking at the use-case split, the 8400F is the choice for any compute-heavy task. In multi-threaded rendering, its Cinebench R23 multicore score of 20851 versus 10152 for the 5825U represents a 51.3% advantage, a massive gap for productivity applications like video encoding or 3D rendering. The gap is equally stark in single-threaded performance, where the 8400F scores 2943 in Cinebench R23 single-core, a 50.7% lead over the 1452 posted by the 5825U. This translates directly to snappier application responsiveness and faster day-to-day operation.

The 5825U, however, occupies a different role entirely. It is a mobile processor with a 15 W TDP, designed for battery-powered systems where sustained performance is secondary to efficiency. Its 8 cores and 16 threads provide a capable baseline for laptop workloads, and its integrated Radeon Vega 8 graphics mean the system can operate without a discrete GPU. The data shows its Passmark multithread score of 18131 is respectable for a chip in this power class, but it simply cannot match the raw output of a 65 W desktop part. The 8400F, with no integrated graphics, requires a dedicated GPU, but its 6 cores and 12 threads deliver 24389 in the same Passmark multithread test, a 25.7% improvement.

For users deciding based on raw performance, the 8400F wins every scenario. For users requiring a self-contained mobile solution, the 5825U is the only one of the two that fits that form factor. The database shows no overlap in their strengths: the 8400F is universally faster, while the 5825U offers portability and integrated graphics where the 8400F cannot compete.

Architecture Differences

The two processors come from different architectural generations and target different market segments. The Ryzen 7 5825U is built on the Zen 3 architecture, codenamed Barcelo, using a 7 nm process from TSMC. It features 8 cores and 16 threads, with a base clock of 2000 MHz and a boost clock of 4.5 GHz. The Ryzen 5 8400F uses the newer Zen 4 architecture, codenamed Phoenix, on a 4 nm process, also from TSMC. It offers 6 cores and 12 threads, but runs at significantly higher clocks: 4.2 GHz base and 4.7 GHz boost.

The transistor counts reflect the generational leap. The 5825U packs 10,700 million transistors on a 180 mm² die, while the 8400F has 25,000 million transistors on a slightly smaller 178 mm² die. This density improvement is a direct result of the 4 nm process node, allowing the 8400F to achieve higher clock speeds despite fewer physical cores.

Cache hierarchies also differ. Both processors share 16 MB of L3 cache, but the L2 cache is configured differently. The 5825U has 512 KB of L2 per core, while the 8400F has 1 MB per core, doubling the per-core L2 allocation. L1 cache is identical at 64 KB per core. This larger L2 cache in the 8400F contributes to its single-threaded superiority, as more data can be held closer to the cores.

Memory support is another fundamental split. The 5825U uses DDR4 memory with dual-channel support and a memory bandwidth of 51.2 GB/s. It also supports ECC memory. The 8400F uses DDR5, also dual-channel, but with a much higher memory bandwidth of 83.2 GB/s. Notably, the 8400F does not support ECC memory. The PCIe interface also differs: the 5825U offers Gen 3 with 16 lanes, while the 8400F provides Gen 4 with 20 lanes, enabling faster data transfer to GPUs and NVMe storage.

The 5825U includes integrated Radeon Vega 8 graphics, a feature absent from the 8400F, which has no integrated graphics at all. The 5825U is an unlocked multiplier? No, it is not, while the 8400F has an unlocked multiplier, allowing for overclocking. Socket compatibility is entirely different: the 5825U uses AMD Socket FP6, a mobile socket, while the 8400F uses AMD Socket AM5, a desktop socket.

The Verdict

The data is unambiguous. The AMD Ryzen 5 8400F is the superior processor in every measured benchmark. Its lowest margin of victory is a 2% lead in Passmark integer math (74021 vs 72577), and its largest is the 51.3% lead in Cinebench R23 multicore. For any user prioritizing performance, whether for gaming, content creation, or general desktop use, the 8400F is the only logical choice between these two.

The Ryzen 7 5825U cannot be recommended on performance grounds alone. Its 8 cores and 16 threads do not compensate for the architectural and clock speed disadvantages. Its 15 W TDP and integrated graphics make it suitable exclusively for laptops or compact mobile systems where power draw is critical and a discrete GPU is undesirable. In that context, it is a capable processor, but the database shows it trailing the 8400F by margins ranging from 2% to over 50% across all workloads.

The 8400F also benefits from a more modern platform. DDR5 memory support, PCIe Gen 4, and an unlocked multiplier make it a more flexible and future-proof option for desktop builders. The 5825U is locked to DDR4 and PCIe Gen 3, which are older standards. The launch MSRP of the 8400F is $170, a single data point that does not alter the performance analysis.

In short, the 8400F wins outright. The 5825U is a mobile chip that serves a specific niche, and within that niche it performs adequately, but it cannot match the desktop part in any head-to-head comparison.

FAQ

Q: Which processor has better multi-core performance?

A: The Ryzen 5 8400F. It scores 20851 in Cinebench R23 multicore versus 10152 for the Ryzen 7 5825U, a 51.3% advantage.

Q: Does the Ryzen 7 5825U have integrated graphics?

A: Yes, it includes Radeon Vega 8 graphics. The Ryzen 5 8400F has no integrated graphics at all.

Q: What memory types do these processors support?

A: The 5825U supports DDR4 memory, while the 8400F supports DDR5. The 8400F also offers higher memory bandwidth at 83.2 GB/s versus 51.2 GB/s for the 5825U.

Q: Which processor has more cores?

A: The Ryzen 7 5825U has 8 cores and 16 threads. The Ryzen 5 8400F has 6 cores and 12 threads.

Q: Is the Ryzen 5 8400F overclockable?

A: Yes, it has an unlocked multiplier. The Ryzen 7 5825U does not have an unlocked multiplier.

Q: What is the TDP of each processor?

A: The 5825U has a TDP of 15 W, while the 8400F has a TDP of 65 W.

Head-to-Head Benchmarks

The Ryzen 5 8400F dominates every recorded benchmark, but the size of the margin varies significantly by workload type. The largest single victory is in Cinebench R23 multicore, where the 8400F scores 20851 against the 5825U's 10152, a 51.3% difference. This test stresses all cores simultaneously, and the 8400F's higher clocks and newer architecture prove decisive. The single-core version of the same test shows a 50.7% lead (2943 vs 1452), indicating that the 8400F's per-core efficiency is nearly as strong as its multi-threaded advantage.

In Passmark workloads, the margins are smaller but still consistently in favor of the 8400F. The closest contest is integer math, where the 8400F scores 74021 versus 72577, a narrow 2% lead. Floating point math shows a 16.7% advantage (46217 vs 38482), while data compression shows a 23% lead (288158 vs 221938). The 8400F also wins data encryption by 15.4% (16646 vs 14088) and extended instructions by 35.1% (22175 vs 14394).

The most dramatic Passmark result is find prime numbers, where the 8400F scores 89 versus 48 for the 5825U, a 46.1% difference. This workload is highly sensitive to single-threaded integer performance and clock speed, areas where the 8400F excels. Physics simulation shows a 41.9% lead (1332 vs 774), and random string sorting shows a 32% lead (34604 vs 23539). The Passmark multithread score is 24389 for the 8400F versus 18131 for the 5825U, a 25.7% gap.

In Cinebench R15, the 8400F leads by 16.4% in multicore (2101 vs 1757) and 21.6% in single-core (296 vs 232). The single-thread Passmark scores are 3685 for the 8400F and 3053 for the 5825U, a 17.2% difference. Across all 15 comparisons, the 8400F wins by an average margin that is consistently substantial, with only integer math falling below double digits. The data leaves no room for ambiguity: the 8400F is faster in every measurable category.

Specification Differences

The two processors differ in nearly every core specification. The Ryzen 7 5825U has 8 cores and 16 threads, while the Ryzen 5 8400F has 6 cores and 12 threads. Base clocks are 2000 MHz for the 5825U and 4200 MHz for the 8400F, with boost clocks of 4.5 GHz and 4.7 GHz respectively. TDP is 15 W for the mobile chip and 65 W for the desktop chip.

The 5825U uses the Zen 3 architecture on a 7 nm process, while the 8400F uses Zen 4 on a 4 nm process. Transistor counts are 10,700 million versus 25,000 million, with die sizes of 180 mm² and 178 mm². L2 cache is 512 KB per core for the 5825U and 1 MB per core for the 8400F, while L3 cache is 16 MB shared for both.

Memory support differs: the 5825U uses DDR4 with 51.2 GB/s bandwidth and ECC support, while the 8400F uses DDR5 with 83.2 GB/s bandwidth and no ECC. PCIe lanes are Gen 3 with 16 lanes for the 5825U and Gen 4 with 20 lanes for the 8400F. The 5825U has integrated Radeon Vega 8 graphics, while the 8400F has none. Sockets are FP6 for the mobile part and AM5 for the desktop part. The 8400F has an unlocked multiplier; the 5825U does not.