AMD Ryzen 7 8840HX vs AMD Ryzen 7 9850X3D Comparison

FAQ

Q: Which processor has more cores?

A: The AMD Ryzen 7 8840HX has 12 cores and 24 threads, while the AMD Ryzen 7 9850X3D has 8 cores and 16 threads.

Q: Which processor has the higher boost clock?

A: The AMD Ryzen 7 9850X3D boosts up to 5.60 GHz, compared to 5.10 GHz for the AMD Ryzen 7 8840HX.

Q: Which CPU wins in Cinebench R23 multi-core?

A: The AMD Ryzen 7 8840HX scores 25,265 versus 22,807 for the AMD Ryzen 7 9850X3D, a 10.8% advantage.

Q: What is the difference in L3 cache size?

A: The AMD Ryzen 7 9850X3D has 96 MB of shared L3 cache, while the AMD Ryzen 7 8840HX has 64 MB of shared L3 cache.

Q: Which processor has the higher single-thread score?

A: The AMD Ryzen 7 9850X3D scores 2,228 in Cinebench R23 single-core compared to 1,857 for the AMD Ryzen 7 8840HX, a 16.7% lead.

Q: What sockets do these CPUs use?

A: The AMD Ryzen 7 8840HX uses AMD Socket FL1, while the AMD Ryzen 7 9850X3D uses AMD Socket AM5.

Architecture Differences

The two processors come from different AMD generations and use different core architectures. The AMD Ryzen 7 8840HX is part of the 8000 series, built on Zen 4 with the Dragon Range codename. It uses a 5 nm process at TSMC and contains 13,140 million transistors across a die size of 2x 71 mm². The AMD Ryzen 7 9850X3D belongs to the 9000 series, uses Zen 5 with the Granite Ridge codename, and is manufactured on a 4 nm process at TSMC. It has 8,315 million transistors on a single 70.6 mm² die.

The 8840HX is a 12-core, 24-thread mobile part with a base clock of 2.90 GHz and a boost clock of 5.10 GHz. The 9850X3D is an 8-core, 16-thread desktop part with a base clock of 4.70 GHz and a boost clock of 5.60 GHz. The higher base clock of the 9850X3D reflects its desktop orientation, while the 8840HX relies on its extra cores for throughput.

Cache configurations also differ. The 8840HX provides 64 KB of L1 per core and 1 MB of L2 per core, with 64 MB of shared L3. The 9850X3D provides 80 KB of L1 per core and 1 MB of L2 per core, with 96 MB of shared L3. The larger L3 on the 9850X3D aligns with its X3D positioning, which typically targets cache-sensitive workloads.

Memory support shows both processors use DDR5 with dual-channel buses. The 8840HX has a memory bandwidth of 83.2 GB/s, while the 9850X3D reaches 89.6 GB/s. ECC memory support differs: the 8840HX does not support ECC, while the 9850X3D does. PCIe capabilities also differ, with the 8840HX offering Gen 5 with 28 lanes (CPU only) and the 9850X3D offering Gen 5 with 24 lanes (CPU only). Integrated graphics are present on both, with the 8840HX using Radeon 610M and the 9850X3D using Radeon Graphics.

The TDP values are notably different. The 8840HX has a 55 W TDP, suitable for mobile systems, while the 9850X3D has a 120 W TDP, typical for desktop parts. Both processors have unlocked multipliers. The production status for both is Active. The 8840HX was released on 2025-04-22, while the 9850X3D was released on 2026-01-28.

Head-to-Head Benchmarks

The benchmark comparison covers 13 recorded tests across Cinebench and PassMark suites. The AMD Ryzen 7 8840HX wins 7 of those tests, while the AMD Ryzen 7 9850X3D wins 6.

The biggest win for the 8840HX comes in PassMark data encryption, where it scores 29,919 versus 22,856, a 30.9% advantage. The 8840HX also leads clearly in PassMark integer math with 146,506 against 123,140, a 19% margin. In Cinebench R23 multi-core, the 8840HX scores 25,265 compared to 22,807, a 10.8% lead. PassMark random string sorting goes to the 8840HX by 16.5%, with scores of 57,971 versus 49,764. Floating point math favors the 8840HX at 86,747 versus 81,998, a 5.8% difference. Data compression shows a narrower 4.6% edge for the 8840HX, 496,427 versus 474,501. The PassMark multithread test is close, with the 8840HX winning 41,732 to 41,318, a 1% margin.

The largest win for the 9850X3D is in PassMark physics, where it scores 4,171 against 2,185, a 47.6% advantage. This is the single biggest proportional gap in either direction. The 9850X3D also leads in PassMark find prime numbers, scoring 435 versus 304, a 30.1% edge. In Cinebench R23 single-core, the 9850X3D scores 2,228 versus 1,857, a 16.7% lead. PassMark single-thread shows the same pattern with 4,704 versus 3,958, a 15.9% difference. Extended instructions favor the 9850X3D by 7%, with scores of 39,272 versus 36,527.

The average benchmark score places the 8840HX at 71,797 with a 94th percentile ranking among all CPUs. The 9850X3D has an average score of 58,386 and sits in the 92nd percentile. The nearest rivals for the 8840HX include the Intel Core Ultra 7 265KF at 71,910 (-0.2%), the Intel Xeon Platinum 8270 at 71,370 (0.6%), the Intel Xeon 6517P at 72,350 (-0.8%), and the Intel Xeon 6724P at 72,396 (-0.8%). The nearest rivals for the 9850X3D include the Intel Xeon Platinum 8260M at 58,323 (0.1%), the Intel Xeon w5-2545 at 58,504 (-0.2%), the Intel Core i9-14900 at 58,115 (0.5%), and the AMD Ryzen AI 9 HX 470 at 58,826 (-0.7%).

Specification Differences

The two processors differ across several key specifications. The 8840HX has 12 cores and 24 threads, while the 9850X3D has 8 cores and 16 threads. Base clocks differ substantially: 2.90 GHz for the 8840HX versus 4.70 GHz for the 9850X3D. Boost clocks also differ, with the 8840HX reaching 5.10 GHz and the 9850X3D reaching 5.60 GHz.

TDP is another major difference. The 8840HX runs at 55 W, while the 9850X3D runs at 120 W. The sockets are different: AMD Socket FL1 for the 8840HX and AMD Socket AM5 for the 9850X3D. Architecture differs as well, with Zen 4 on the 8840HX and Zen 5 on the 9850X3D. The process node moves from 5 nm to 4 nm, with transistor counts of 13,140 million versus 8,315 million. Die sizes are 2x 71 mm² for the 8840HX and 70.6 mm² for the 9850X3D.

Cache hierarchies differ in L1 and L3. The 8840HX has 64 KB of L1 per core, while the 9850X3D has 80 KB per core. Both share 1 MB of L2 per core. L3 cache is 64 MB on the 8840HX and 96 MB on the 9850X3D. Memory bandwidth is higher on the 9850X3D at 89.6 GB/s versus 83.2 GB/s. ECC memory support is present only on the 9850X3D. PCIe lanes differ, with 28 lanes on the 8840HX and 24 lanes on the 9850X3D. Integrated graphics differ as well: Radeon 610M on the 8840HX and Radeon Graphics on the 9850X3D. The market segments are Mobile for the 8840HX and Desktop for the 9850X3D. Release dates are 2025-04-22 for the 8840HX and 2026-01-28 for the 9850X3D. The 9850X3D has a launch MSRP of $499.

Where Each One Wins

The AMD Ryzen 7 8840HX wins in workloads that scale with core count. Its 12 cores and 24 threads give it a clear edge in multi-threaded tasks. Cinebench R23 multi-core shows a 10.8% lead. PassMark multithread is close but still favors the 8840HX at 1%. Integer math, floating point math, data compression, data encryption, and random string sorting all go to the 8840HX, with margins ranging from 4.6% to 30.9%. The data encryption result is particularly strong, with a 30.9% advantage.

The AMD Ryzen 7 9850X3D wins in workloads that favor higher clocks and larger cache. Its single-core performance is clearly superior. Cinebench R23 single-core shows a 16.7% lead, and PassMark single-thread shows a 15.9% lead. The physics test shows the largest gap of all, with the 9850X3D ahead by 47.6%. Find prime numbers also favors the 9850X3D by 30.1%. Extended instructions go to the 9850X3D by 7%.

The 8840HX benefits from its higher core count in rendering and throughput-oriented tasks. The 9850X3D benefits from its higher base clock, higher boost clock, and larger L3 cache in latency-sensitive and single-threaded workloads. The 9850X3D also has a higher memory bandwidth at 89.6 GB/s, which may contribute to its performance in memory-heavy scenarios.

The Verdict

The data shows a clear split based on workload type. The AMD Ryzen 7 8840HX is the stronger choice for multi-threaded throughput. It wins 7 of 13 head-to-head tests, including the most important multi-core benchmark, Cinebench R23, by 10.8%. Its 12-core configuration provides a meaningful advantage in integer math, floating point math, encryption, compression, and sorting tasks. The 8840HX also holds a higher average benchmark score of 71,797 versus 58,386 and a higher percentile ranking at 94 versus 92.

The AMD Ryzen 7 9850X3D is the stronger choice for single-threaded and latency-sensitive workloads. It wins 6 of 13 tests, with decisive victories in physics, prime number finding, and single-core benchmarks. The 47.6% lead in physics is the largest margin recorded in either direction. Its higher base clock of 4.70 GHz, boost clock of 5.60 GHz, and 96 MB of L3 cache support this pattern.

The market segments reinforce the intended use. The 8840HX is a mobile processor with a 55 W TDP, meaning it can fit into laptops where power constraints matter. The 9850X3D is a desktop processor with a 120 W TDP, which allows sustained high clocks in a desktop chassis. The 9850X3D also supports ECC memory, which may matter for certain workstation uses, and it carries a launch MSRP of $499.

For a system that prioritizes multi-core workloads, the 8840HX delivers more parallel performance. For a system that prioritizes single-thread speed and cache-sensitive tasks, the 9850X3D is the better fit. The choice depends on the workload mix, not on overall superiority.