AMD Ryzen 7 8840HX vs AMD Ryzen 7 PRO 9755X3D Comparison

Head-to-Head Benchmarks

The benchmark data splits these two processors into distinct personality profiles, with the AMD Ryzen 7 PRO 9755X3D taking five wins and the AMD Ryzen 7 8840HX taking six. The most dramatic margin belongs to the desktop part in the physics workload: the 9755X3D scores 4056 against the 8840HX's 2185, a staggering 85.6% advantage. That is the single largest delta in the entire comparison, and it signals a fundamental difference in how the two chips handle constrained, latency-sensitive workloads.

The 9755X3D also dominates prime number finding, scoring 451 versus 304, a 48.4% lead. This workload is notoriously sensitive to cache depth and memory latency, and the results reflect the desktop chip's architectural strengths. Single-thread performance also favors the 9755X3D, with scores of 4443 against 3958, a 12.3% advantage. Extended instructions show a narrower win for the 9755X3D at 38436 versus 36527, a 5.2% edge.

The 8840HX counters with a spread of wins across throughput-oriented tasks. Integer math shows the largest gap in its favor: 146506 versus 119404, an 18.5% lead. Data encryption goes to the 8840HX by 29919 over 22632, a 24.4% margin. Random string sorting favors the mobile chip at 57971 versus 49050, a 15.4% advantage. Data compression is close but still a win for the 8840HX at 496427 against 469207, a 5.5% edge. Floating point math goes to the 8840HX at 86747 versus 80284, a 7.5% lead. The multithread score, often a good summary metric, also favors the 8840HX: 41732 versus 40474, a 3% difference.

What the raw numbers reveal is a split between responsiveness and aggregate throughput. The 9755X3D wins where per-core efficiency and cache behavior matter most, while the 8840HX wins where raw core count and parallel execution dominate. In the overall average benchmark score, the 9755X3D sits at 75716 against the 8840HX's 71797, a difference of roughly 5.5% in favor of the desktop part. The percentile rankings echo this: the 9755X3D lands in the 95th percentile of all CPUs, while the 8840HX sits in the 94th.

The Verdict

The data points to a clear division of labor. The AMD Ryzen 7 PRO 9755X3D is the pick for workloads that reward deep cache, low latency, and strong single-core execution. Its physics score, prime number result, and single-thread numbers all point to a processor that excels in interactive, latency-bound, and lightly threaded scenarios. The 85.6% physics lead is not a marginal difference; it is a categorical one.

The AMD Ryzen 7 8840HX, with 12 cores and 24 threads against the 9755X3D's 8 cores and 16 threads, is the choice for sustained parallel throughput. Its wins in integer math, encryption, compression, floating point, and random string sorting show a chip that leverages its extra cores effectively in batch and content-creation workloads. The multithread score, though close, reinforces this trend.

For a buyer building a workstation or a high-end desktop system focused on simulation, physics, or single-thread responsiveness, the recorded data favors the 9755X3D. For a mobile platform or a system that prioritizes multi-core throughput in compression, encryption, or integer-heavy tasks, the 8840HX is the better match. The average benchmark scores, however, give the overall edge to the 9755X3D at 75716 against 71797.

Architecture Differences

The two processors come from different generations and target different sockets. The AMD Ryzen 7 PRO 9755X3D belongs to the 9000 series, codenamed Granite Ridge, built on Zen 5 architecture. It uses a 4 nm process node from TSMC, with 8,315 million transistors on a 70.6 mm² die. It is a desktop and workstation part designed for AMD Socket AM5, with a TDP of 120 watts. Its base clock is 4.70 GHz and boost clock is 5.20 GHz. The cache configuration is notable: 80 KB L1 per core, 1 MB L2 per core, and 96 MB of shared L3. Memory support is DDR5 over a dual-channel bus, with 89.6 GB/s of bandwidth. It supports ECC memory and includes Radeon Graphics as integrated graphics. The PCIe interface is Gen 5 with 24 lanes from the CPU. The multiplier is locked.

The AMD Ryzen 7 8840HX is an 8000 series mobile part, codenamed Dragon Range, built on Zen 4 architecture. It uses a 5 nm process node, also from TSMC, with 13,140 million transistors across a 2x 71 mm² die configuration. It fits AMD Socket FL1 and has a TDP of just 55 watts. Base clock is 2.90 GHz with a boost clock of 5.10 GHz. Cache is smaller per core at 64 KB L1, 1 MB L2, and 64 MB shared L3. Memory bandwidth is 83.2 GB/s over dual-channel DDR5, and ECC memory is not supported. Integrated graphics are Radeon 610M. PCIe is Gen 5 with 28 lanes from the CPU. The multiplier is unlocked.

Two key architectural contrasts stand out. First, the 9755X3D has a significantly higher base clock at 4.70 GHz versus 2.90 GHz, which helps explain its single-thread and latency-sensitive wins. Second, the 8840HX has 50% more cores and threads, which drives its throughput advantages. The 9755X3D compensates with a much larger L3 cache at 96 MB versus 64 MB, and a smaller process node at 4 nm versus 5 nm. The transistor counts differ substantially: 13,140 million in the 8840HX versus 8,315 million in the 9755X3D, though the mobile part uses a dual-die design.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 7 PRO 9755X3D boosts to 5.20 GHz, while the AMD Ryzen 7 8840HX boosts to 5.10 GHz.

Q: How do the multithread scores compare?

A: The AMD Ryzen 7 8840HX scores 41732 in the multithread test, against 40474 for the AMD Ryzen 7 PRO 9755X3D, a 3% lead for the mobile chip.

Q: Which chip has the larger L3 cache?

A: The AMD Ryzen 7 PRO 9755X3D has 96 MB of shared L3 cache, while the AMD Ryzen 7 8840HX has 64 MB.

Q: What is the TDP difference?

A: The AMD Ryzen 7 PRO 9755X3D has a TDP of 120 watts, while the AMD Ryzen 7 8840HX has a TDP of 55 watts.

Q: Which processor supports ECC memory?

A: The AMD Ryzen 7 PRO 9755X3D supports ECC memory; the AMD Ryzen 7 8840HX does not.

Q: How do the single-thread scores compare?

A: The AMD Ryzen 7 PRO 9755X3D scores 4443 in the single-thread test, against 3958 for the AMD Ryzen 7 8840HX, a 12.3% advantage.

Where Each One Wins

The AMD Ryzen 7 PRO 9755X3D wins in physics, prime number finding, extended instructions, and single-thread performance. These are workloads that depend on low latency, deep cache, and high per-core efficiency. The physics score of 4056 versus 2185 is the most decisive result in the entire dataset, and it suggests the 9755X3D is the better choice for simulation, scientific computing, and any interactive workload that cannot tolerate thread synchronization overhead. The prime number score of 451 versus 304 reinforces this: the 9755X3D handles tight loops with repeated memory access far better. The 12.3% single-thread lead means legacy software, lightly threaded applications, and real-time tasks will run noticeably faster on the desktop part.

The AMD Ryzen 7 8840HX wins in data compression, data encryption, floating point math, integer math, multithread, and random string sorting. These are throughput-oriented tasks that scale with core count and parallel execution. The 24.4% encryption lead is particularly strong, making the 8840HX the better fit for file encryption, VPN throughput, and secure data processing. The 18.5% integer math advantage points to compilation, spreadsheet calculations, and general productivity workloads. The 15.4% random string sorting win suggests better handling of data manipulation and text-processing pipelines. The 7.5% floating point edge covers scientific and engineering calculations that are parallelizable. The 5.5% compression win matters for archiving and data storage tasks. The 3% multithread lead, while modest, confirms the overall throughput orientation.

The average benchmark scores provide a final summary: the 9755X3D at 75716 is ahead of the 8840HX at 71797, but the comparison is not a simple total. The desktop chip wins the overall average while losing the multithread test, which means the choice depends entirely on workload profile. For a system that needs raw parallel performance in a mobile form factor, the 8840HX is the data-backed pick. For a workstation that needs the best possible latency-bound and single-thread performance, the 9755X3D is the clear winner.