AMD Ryzen 7 5800X vs AMD Ryzen 7 7840H Comparison

Head-to-Head Benchmarks

The benchmark data presents a clear split between these two AMD Ryzen 7 processors. The Ryzen 7 7840H, a mobile part, takes 14 of the 21 recorded head-to-head tests, while the desktop Ryzen 7 5800X wins 7. The margins tell a more nuanced story than the raw win count.

The most dramatic difference appears in Cinebench R23. The 7840H scores 23,731 in multicore, a 53.3% advantage over the 5800X's 15,476. The single-core gap is even more striking: 3,350 versus 1,574.5, a 112.8% delta. These are not incremental improvements; they represent a generational leap in per-clock efficiency and boost behavior.

Cinebench R15 shows a different pattern. The older test favors the 5800X in multicore, 2608.5 versus 2392, an 8.3% deficit for the mobile chip. But in R15 single-core, the 7840H leads 337 versus 265.5, a 26.9% advantage. This suggests the 5800X's sustained all-core operation on the older workload holds up, while the 7840H's single-thread performance is consistently superior.

The 3DMark suite splits along thread-count lines. The 5800X wins 16-thread (7586 vs 7461, -1.6%) and max-thread (7578 vs 7409, -2.2%) tests. The 7840H wins 2-thread (1906 vs 1846, 3.3%), 4-thread (3638 vs 3543, 2.7%), 8-thread (6116 vs 6035, 1.3%), and single-thread (976 vs 943, 3.5%). The pattern is consistent: the mobile chip excels at lower thread counts, while the desktop chip holds a slight edge when all threads are saturated.

PassMark results add further detail. The 7840H wins extended instructions (25,654 vs 23,573, 8.8%), floating point math (58,724 vs 52,639, 11.6%), integer math (96,692 vs 94,969, 1.8%), multithread (27,919 vs 27,732, 0.7%), random string sorting (38,938 vs 35,401, 10%), and single-thread (3,641 vs 3,445, 5.7%). The 5800X wins data compression (345,414 vs 341,520, -1.1%), data encryption (21,191 vs 20,162, -4.9%), find prime numbers (124 vs 83, -33.1%), and physics (1,364 vs 1,301, -4.6%).

The prime number test is the single largest loss for the 7840H, a 33.1% deficit. This workload likely responds to the 5800X's larger L3 cache and desktop-oriented memory subsystem. Conversely, the 7840H's floating point and extended instruction wins of 11.6% and 8.8% respectively point to the newer Zen 4 architecture's improved execution units.

FAQ

Q: Which processor has a higher average benchmark score?

A: The Ryzen 7 7840H records an average benchmark score of 29,868, while the Ryzen 7 5800X averages 29,123. Both sit at the 81st percentile among all CPUs in the database.

Q: How do the two compare in Cinebench R23 multicore?

A: The 7840H scores 23,731 versus 15,476 for the 5800X, a 53.3% advantage. This is the largest multicore margin in the head-to-head data.

Q: Is the 5800X faster in any multithreaded workload?

A: Yes. The 5800X wins 3DMark 16-thread (7,586 vs 7,461) and max-thread (7,578 vs 7,409) tests, plus Cinebench R15 multicore (2,608.5 vs 2,392) and PassMark physics (1,364 vs 1,301).

Q: What is the boost clock difference?

A: The 7840H boosts to 5.10 GHz, while the 5800X reaches 4.70 GHz. Both share a 3.80 GHz base clock.

Q: Which processor supports DDR5 memory?

A: Only the 7840H supports DDR5. The 5800X is limited to DDR4. The 7840H also offers 89.6 GB/s memory bandwidth versus 51.2 GB/s for the 5800X.

Q: Does the 7840H have integrated graphics?

A: Yes, the 7840H includes Radeon 780M graphics. The 5800X has no integrated GPU, requiring a discrete graphics card.

The Verdict

The data supports a clear division of roles. The Ryzen 7 7840H is the better choice for single-threaded and lightly threaded workloads, including most everyday applications, content creation with floating point math, and any software that scales well with newer instruction sets. Its Cinebench R23 single-core score of 3,350 versus 1,574.5 is the defining metric: more than double the older chip's result.

The 5800X retains relevance for specific multithreaded tasks. Its wins in 3DMark 16-thread and max-thread tests, Cinebench R15 multicore, and PassMark physics indicate sustained all-core throughput in certain scenarios. The prime number test advantage of 33.1% suggests workloads that benefit from the larger 32 MB L3 cache will still favor the desktop part.

For a mobile user, the 7840H is the obvious pick. It delivers superior single-thread performance, competitive or better multicore scores in modern benchmarks, and includes integrated graphics. For a desktop user with existing AM4 hardware, the 5800X offers a lower launch MSRP of $449 and remains competitive in specific multithreaded tasks, but the overall benchmark record favors the newer architecture.

Specification Differences

The two processors differ in several core specifications. The 7840H boosts to 5.10 GHz versus 4.70 GHz for the 5800X, while both run at 3.80 GHz base. The 7840H has a 35 W TDP, compared to 105 W for the 5800X, a 70 W difference that reflects the mobile versus desktop design targets.

The 7840H uses AMD Socket FP8, while the 5800X uses AMD Socket AM4. The 7840H supports DDR5 memory with 89.6 GB/s bandwidth; the 5800X supports DDR4 with 51.2 GB/s. Both are dual-channel and support ECC memory.

The 7840H includes Radeon 780M integrated graphics; the 5800X has none. The 7840H has a locked multiplier; the 5800X is multiplier unlocked. The 5800X has a recorded release date of 2020-11-04 and a launch MSRP of $449; the 7840H has no recorded launch MSRP.

The 7840H's part numbers are 100-000000955 (FP7r2), 100-000000964 (FP7), and 100-000001129 (FP8). The 5800X's part number is 100-000000063.

Architecture Differences

The 7840H is built on Zen 4 architecture with the Phoenix codename, while the 5800X uses Zen 3 with the Vermeer codename. This architectural gap explains many of the benchmark differences.

The 7840H uses a 4 nm process from TSMC, versus 7 nm for the 5800X. The transistor counts differ substantially: 25,000 million for the 7840H versus 4,150 million for the 5800X. Die size also differs: 178 mm² for the mobile chip versus 74 mm² for the desktop chip.

Cache configurations differ. Both have 64 KB L1 per core. The 7840H has 1 MB L2 per core, while the 5800X has 512 KB per core. The L3 cache is 16 MB shared for the 7840H, while the 5800X has 32 MB. The larger L3 on the 5800X likely contributes to its wins in data compression, encryption, and prime number tests.

Both use PCIe Gen 4 with 20 lanes (CPU only). The 7840H is classified as a mobile processor, while the 5800X is a desktop processor. Both are currently in active production. The 7840H belongs to the 7000 series, the 5800X to the 5000 series. Both are 8-core, 16-thread parts.