AMD Ryzen 7 7840H

The AMD Ryzen 7 7840H is an 8-core, 16-thread mobile processor built on the Zen 4 architecture and codenamed Phoenix. It operates with a base clock of 3.80 GHz and a boost clock of 5.10 GHz, manufactured on TSMC's 4 nm process node, and holds an 86th percentile ranking among all CPUs in the database. The benchmark data positions this chip as a high-tier mobile part, with the average benchmark score of 29,868 placing it in a tightly contested performance cluster.

Benchmark Performance

The 7840H's performance profile is defined by strong multi-threaded throughput paired with respectable single-thread capabilities. In Cinebench R23, the multicore score reaches 23,731 points, while the single-core score sits at 3,350 points. This represents a roughly 7.1x scaling from single to multi-core, indicating that the processor efficiently utilizes its 16 threads under heavy parallel loads. The Cinebench R20 results reinforce this pattern, with a multicore score of 9,967 and a single-core score of 1,407.

In 3DMark testing, the scaling from 2 threads to max threads is notable. The 2-thread score of 1,906 expands to 7,409 at max threads, showing a 3.9x improvement as additional cores are engaged. The 8-thread score of 6,116 is particularly telling, as it captures 82.5% of the max-thread performance, suggesting that most real-world workloads that utilize up to eight threads will see near-peak throughput. The 16-thread score of 7,461 is only 0.7% higher than the max-thread result, indicating that the processor's full potential is accessible without exotic cooling.

PassMark results show a balanced mix of compute capabilities. The multithread score of 27,919 and single-thread score of 3,641 demonstrate a 7.7x ratio, consistent with the Cinebench findings. Integer math performance is strong at 96,692, while floating-point math reaches 58,724. Data compression scores hit 341,520, and encryption reaches 20,162, with extended instruction performance at 25,654. The physics score of 1,301 and prime number finding score of 83 are lower in absolute terms but reflect the specific nature of those tests.

How It Compares

The nearest rival is the AMD Ryzen 7 6800HS, which posts an average score of 29,856 against the 7840H's 29,868. The delta is 0%, meaning the two processors are effectively tied in overall benchmark performance. This is noteworthy because the 6800HS is a previous-generation part, yet the data shows no meaningful generational advantage for the 7840H in aggregate scores.

The AMD Ryzen 9 7940HS sits slightly ahead with an average score of 29,948, representing a -0.3% delta relative to the 7840H. This places the 7840H within a hair's breadth of a higher-tier part in the same family, making the performance gap negligible for most applications. The 7940HS is nominally superior, but the benchmark data does not support a clear performance hierarchy.

The AMD Ryzen 7 5800XT scores 29,774, which is 0.3% below the 7840H. This rival is a desktop-oriented part, yet the mobile 7840H edges it out in aggregate benchmarks. The 0.3% margin is within noise, but it demonstrates that the 7840H's efficiency does not come at a significant performance cost compared to a desktop chip.

The AMD Ryzen 7 PRO 5755GE completes the rival set with an average score of 29,740, a 0.4% deficit. This professional-grade processor trails the 7840H by a similarly small margin. The overall picture is that the 7840H sits in a dead heat with four competitors spread across mobile and desktop segments, with deltas ranging from -0.3% to +0.4%.

Power and Thermals

The 7840H carries a TDP of 35 watts, classifying it as an ultra-low-power mobile processor designed for thin-and-light laptops. This power envelope is modest for an 8-core, 16-thread part, and it implies that a capable air cooler is sufficient for sustained operation. The 4 nm process node from TSMC is a key enabler here, as the smaller geometry reduces power density compared to larger nodes.

The thermal implications are straightforward: a 35-watt TDP allows for quiet, compact cooling solutions in portable chassis. The processor's boost clock of 5.10 GHz can be achieved when thermal headroom permits, but sustained all-core workloads will likely settle at lower clocks to respect the power limit. The benchmark scores, particularly the Cinebench R23 multicore result of 23,731, indicate that thermal throttling does not cripple performance, as this figure is competitive with higher-TDP parts.

Cooling tier recommendations would place this chip in the "efficient mainstream" category. A standard dual-heatpipe notebook cooler with a single fan should manage the 35-watt load without excessive noise. Users seeking maximum sustained performance in demanding tasks might prefer a laptop with a slightly larger vapor chamber, but the data does not suggest that exotic cooling is mandatory.

Who Should Consider It

Gamers will find the 7840H suitable for CPU-bound titles, given the single-thread score of 3,350 in Cinebench R23 and the 3,641 in PassMark. The 8-thread 3DMark score of 6,116 indicates that games leveraging eight threads will run smoothly, while the max-thread score of 7,409 provides headroom for background tasks. The integrated Radeon 780M graphics means light gaming is possible without a discrete GPU, though dedicated graphics will be necessary for demanding titles.

Content creators handling video editing, 3D rendering, or software compilation will benefit from the multicore scores. The Cinebench R23 multicore result of 23,731 and PassMark multithread score of 27,919 show that the 7840H can handle parallel workloads efficiently. Data compression performance of 341,520 suggests strong archival and file-transfer capabilities, while encryption throughput of 20,162 is adequate for secure workflows.

Office and productivity users are well-served by the single-thread performance and modest power draw. The 2-thread 3DMark score of 1,906 ensures responsive application launches and smooth multitasking in everyday tasks. The 35-watt TDP also makes the processor attractive for business laptops that prioritize battery life without sacrificing compute capability.

Platform and Compatibility

The 7840H utilizes AMD Socket FP8, a mobile-specific socket designed for the Phoenix platform. It supports DDR5 memory in a dual-channel configuration, with a memory bandwidth of 89.6 GB/s. ECC memory is supported, which is a differentiator for professional workloads that require data integrity. The memory bus is dual-channel, and users should populate both channels to achieve the rated bandwidth.

PCIe connectivity is Gen 4 with 20 lanes available from the CPU. This provides ample bandwidth for a discrete GPU and one or two NVMe SSDs. The socket compatibility is limited to the FP8 form factor, meaning upgrades are not possible in the traditional sense; the processor is soldered or permanently mounted in most laptops. The part numbers include 100-000000955 (FP7r2), 100-000000964 (FP7), and 100-000001129 (FP8), indicating multiple platform variants exist.

The integrated Radeon 780M graphics uses the same memory pool as the CPU, and the 89.6 GB/s bandwidth is sufficient for 1080p gaming at moderate settings. The upgrade path is effectively closed for this processor, so buyers should select a laptop configuration that meets their long-term needs at the time of purchase.

Single-Thread vs Multi-Thread Behavior

The split between single-thread and multi-thread performance defines the 7840H's character. The Cinebench R23 single-core score of 3,350 is strong, placing it in the upper echelon of mobile processors. This translates to snappy real-world responsiveness in web browsing, office applications, and lightly threaded legacy software. The PassMark single-thread score of 3,641 corroborates this, showing that Zen 4's IPC improvements are evident even at a 35-watt power limit.

Multi-thread behavior is where the 7840H demonstrates its core-count advantage. The Cinebench R23 multicore score of 23,731 is 7.1x the single-core result, which is close to the theoretical 8x limit for 8 cores with simultaneous multithreading. The 3DMark results show a similar pattern: the 4-thread score of 3,638 is 1.9x the 2-thread score, and the 8-thread score of 6,116 is 1.7x the 4-thread score. This scaling efficiency indicates that the processor can feed all cores effectively without memory bandwidth bottlenecks.

The PassMark data reveals nuanced behavior across different workloads. Integer math scales well to 96,692, while floating-point math reaches 58,724. The extended instructions score of 25,654 suggests that AVX-512 or similar vector workloads benefit from the architecture. However, the prime number finding score of 83 is low, indicating that certain integer-heavy algorithms do not scale as effectively. This suggests that users running diverse workloads will see varying benefits from the multi-thread capability, with some tasks approaching near-linear scaling and others plateauing earlier.