AMD Ryzen 7 7840H vs AMD Ryzen 7 8845HS Comparison

The AMD Ryzen 7 8845HS and AMD Ryzen 7 7840H are two 8-core, 16-thread mobile processors that share identical core counts and clock speeds but diverge in their benchmark results. The 8845HS, part of the 8000 series, takes a decisive win in the majority of head-to-head tests, while the 7840H counters with a smaller set of significant victories. The 8845HS secures 15 wins against the 7840H’s 6, yet the 7840H’s wins are often by larger margins in specific rendering workloads. This split creates a clear use-case separation: the 8845HS is the more consistent all-round performer, while the 7840H shows particular strength in certain single-threaded and multi-threaded rendering tasks.

Where Each One Wins

The benchmark data reveals a clear division of labor between these two processors. The AMD Ryzen 7 8845HS dominates in everyday computing and general productivity tasks. It wins in PassMark’s integer math (97,747 vs 96,692), floating-point math (59,254 vs 58,724), and multithreaded tests (28,498 vs 27,919). It also leads in data compression (344,439 vs 341,520) and encryption (20,416 vs 20,162). This pattern suggests the 8845HS is the better choice for office work, software development, and any workload that benefits from consistent multi-threaded throughput.

The AMD Ryzen 7 7840H, conversely, shows its strength in Cinebench rendering tests. It wins Cinebench R23 multi-core by a massive margin (23,731 vs 16,192) and also takes single-core Cinebench R23 (3,350 vs 1,769). This indicates a specific advantage in CPU-heavy rendering and 3D modeling tasks. The 7840H also wins in 3DMark’s 16-thread test (7,461 vs 7,404) and the 8-thread test (6,116 vs 6,085), suggesting that in some heavily threaded scenarios, it can pull ahead.

For gaming, the picture is mixed. The 8845HS wins in 3DMark’s single-thread (990 vs 976) and 2-thread (1,924 vs 1,906) tests, which are often representative of gaming performance. However, the 7840H takes the 3DMark 16-thread and 8-thread tests, which may indicate better performance in games that utilize more cores. The 8845HS also wins in PassMark physics (1,347 vs 1,301) and random string sorting (41,446 vs 38,938), which are relevant for game simulation logic and data handling.

Architecture Differences

Despite their similar names, these two chips come from different generations with distinct codenames. The AMD Ryzen 7 8845HS is part of the 8000 series and uses the Hawk Point codename, while the AMD Ryzen 7 7840H is from the 7000 series with the Phoenix codename. Both are built on TSMC’s 4nm process node, feature the same Zen 4 architecture, and have identical transistor counts of 25,000 million with a die size of 178 mm².

The core configurations are identical: 8 cores, 16 threads, with 64 KB of L1 cache per core, 1 MB of L2 per core, and 16 MB of shared L3 cache. Both support dual-channel DDR5 memory with a bandwidth of 89.6 GB/s and feature the same Radeon 780M integrated graphics. The key architectural difference lies in the memory controller: the 7840H supports ECC memory, while the 8845HS does not (eccMemory: false for 8845HS, true for 7840H). This makes the 7840H more suitable for workstation tasks that require error correction.

Both processors use the AMD Socket FP8 and have a PCIe Gen 4 interface with 20 lanes. The production status is Active for both, but the 8845HS has a release date of December 5, 2023, while no release date is listed for the 7840H. The 8845HS also has a higher TDP of 45W compared to the 7840H’s 35W, which may contribute to its performance differences despite the same clock speeds.

Head-to-Head Benchmarks

The most striking difference in the head-to-head results appears in Cinebench. The 7840H wins Cinebench R23 multi-core by a staggering 31.8% (23,731 vs 16,192) and single-core by 47.2% (3,350 vs 1,769). Similarly, in Cinebench R15 single-core, the 7840H wins by 18.1% (337 vs 276). However, the 8845HS wins Cinebench R15 multi-core by 7.7% (2,575 vs 2,392). This inconsistency is notable: the 7840H excels in the newer Cinebench R23 version but falls behind in the older R15 multi-core test.

In 3DMark, the results are closer. The 8845HS wins the 4-thread test by 1.4% (3,690 vs 3,638) and the single-thread test by 1.4% (990 vs 976). It also narrowly takes the max-thread test by 0.1% (7,413 vs 7,409) and the 2-thread test by 0.9% (1,924 vs 1,906). The 7840H wins the 16-thread test by 0.8% (7,461 vs 7,404) and the 8-thread test by 0.5% (6,116 vs 6,085). These margins are small, indicating near-parity in synthetic 3D workloads.

The PassMark suite shows consistent wins for the 8845HS. The largest margin is in random string sorting, where it leads by 6.4% (41,446 vs 38,938). It also wins in prime number finding by 4.8% (87 vs 83), physics by 3.5% (1,347 vs 1,301), and single-thread by 2.7% (3,738 vs 3,641). The 7840H manages a tie in extended instructions (25,642 vs 25,654, deltaPct 0) but loses in all other PassMark categories. The average benchmark scores reflect this: the 8845HS scores 29,955, while the 7840H scores 29,868, a difference of 0.3%.

Specification Differences

The specification sheets for these two processors are almost identical, with only a few fields differing. The most significant difference is the TDP: the 8845HS has a TDP of 45W, while the 7840H has a TDP of 35W. This higher power envelope for the 8845HS likely explains its consistent performance lead in most tests.

The series and codename differ, as expected: the 8845HS is in the 8000 series with the Hawk Point codename, while the 7840H is in the 7000 series with the Phoenix codename. The generation field also reflects this: the 8845HS is listed as "Ryzen 7 (Zen 4 (Hawk Point))" and the 7840H as "Ryzen 7 (Zen 4 (Phoenix))".

ECC memory support is another differentiator: the 7840H supports ECC (eccMemory: true), while the 8845HS does not (eccMemory: false). This could be a deciding factor for users who require data integrity in their workloads. The part numbers differ as well, with the 8845HS having part numbers 100-000001322(FP7r2), 100-000001384(FP7), and 100-000001311(FP8), while the 7840H has 100-000000955(FP7r2), 100-000000964(FP7), and 100-000001129(FP8).

Finally, the release date is listed for the 8845HS (December 5, 2023) but is null for the 7840H. All other specifications—cores, threads, base clock (3.80 GHz), boost clock (5.10 GHz), cache sizes, memory support, PCIe lanes, integrated graphics, and process node—are identical between the two.

FAQ

Q: Which CPU is faster for multi-threaded rendering?

A: The AMD Ryzen 7 7840H is significantly faster in Cinebench R23 multi-core, scoring 23,731 compared to the 8845HS’s 16,192, a difference of 31.8%. However, the 8845HS wins Cinebench R15 multi-core by 7.7% (2,575 vs 2,392).

Q: Is the 8845HS better for single-threaded performance?

A: The data is mixed. The 8845HS wins 3DMark single-thread (990 vs 976) and PassMark single-thread (3,738 vs 3,641), but the 7840H wins Cinebench R23 single-core by 47.2% (3,350 vs 1,769) and Cinebench R15 single-core by 18.1% (337 vs 276).

Q: Do both CPUs have the same core count and clock speeds?

A: Yes, both have 8 cores, 16 threads, a base clock of 3.80 GHz, and a boost clock of 5.10 GHz. They also share the same cache structure: 64 KB L1 per core, 1 MB L2 per core, and 16 MB shared L3.

Q: Which processor supports ECC memory?

A: The AMD Ryzen 7 7840H supports ECC memory (eccMemory: true), while the AMD Ryzen 7 8845HS does not (eccMemory: false).

Q: What is the TDP difference between the two?

A: The 8845HS has a TDP of 45W, while the 7840H has a TDP of 35W. This 10W difference may explain the 8845HS’s performance advantage in most benchmarks.

Q: How do they compare in overall average benchmark scores?

A: The 8845HS has an average benchmark score of 29,955, while the 7840H scores 29,868. The 8845HS is 0.3% ahead, and both CPUs rank in the 81st percentile of all CPUs.