AMD Ryzen 7 8840HX vs AMD Ryzen 9 9950X Comparison

The AMD Ryzen 9 9950X and AMD Ryzen 7 8840HX are both high-end AMD processors, but they target different segments: the 9950X is a desktop part, the 8840HX is a mobile part. The benchmark data, however, shows a one-sided contest. Across 13 head-to-head tests, the 9950X wins every single one, with margins from 13.5% to 95.9%. This analysis details those results, explains what they mean for potential buyers, and compares the underlying architectures and specifications.

Head-to-Head Benchmarks

The largest gap appears in Passmark's extended instructions test, where the 9950X scores 71,564 against the 8840HX's 36,527, a 95.9% advantage. This test measures SIMD and advanced instruction throughput, and the 9950X's Zen 5 architecture with a 4nm process clearly delivers more headroom. Data compression follows closely: the 9950X processes 896,544 versus 496,427, an 80.6% lead. Floating point math shows an 83.4% difference (159,063 vs 86,747). Integer math is 65.2% higher (242,097 vs 146,506). These are massive margins that indicate the 9950X is in a different performance class for compute-heavy workloads.

Multi-threaded performance is also strongly in favor of the 9950X. In Cinebench R23 multi-core, the 9950X scores 40,924, while the 8840HX scores 25,265, a 62% difference. Passmark's multithread test shows 66,030 vs 41,732, a 58.2% gap. The 9950X's 16 cores and 32 threads versus 12 cores and 24 threads explain part of this, but the per-core efficiency also matters, as seen in single-thread tests.

Single-thread performance is closer but still clearly favors the 9950X. In Cinebench R23 single-core, the 9950X scores 2,202 versus 1,857, an 18.6% lead. Passmark's single-thread test shows 4,737 vs 3,958, a 19.7% difference. This indicates that the 9950X's higher boost clock (5.70 GHz vs 5.10 GHz) and newer Zen 5 architecture provide a meaningful advantage even in lightly threaded tasks.

Other tests: data encryption shows a 48.3% lead (44,366 vs 29,919), physics 50.1% (3,279 vs 2,185), random string sorting 62.8% (94,368 vs 57,971), and find prime numbers 13.5% (345 vs 304). The smallest margin is in prime number finding, but the 9950X still wins.

The 8840HX has no wins in any recorded benchmark. The database records 13 head-to-head comparisons, and the 9950X takes all 13. This is a clean sweep.

To put these scores in context, the 9950X's average benchmark score is 74,640, placing it in the 94th percentile of all CPUs. Its nearest rivals in the database are the AMD Ryzen 7 PRO 9745 (74,761, -0.2%), AMD Ryzen AI 9 HX PRO 475 (74,496, +0.2%), AMD EPYC 4545P (75,373, -1%), and Intel Core Ultra 9 285 (75,488, -1.1%). The 8840HX also sits in the 94th percentile with an average score of 71,797, but its nearest rivals are different: Intel Core Ultra 7 265KF (71,910, -0.2%), Intel Xeon Platinum 8270 (71,370, +0.6%), Intel Xeon 6517P (72,350, -0.8%), and Intel Xeon 6724P (72,396, -0.8%). So while both are high-end, the 9950X's average score is about 4% higher than the 8840HX's, and its head-to-head margins are far larger.

The Verdict

The data is unambiguous: the AMD Ryzen 9 9950X is the superior processor in every measured workload. If performance is the sole criterion, the 9950X is the clear choice. It wins all 13 head-to-head benchmarks, with the smallest margin being 13.5% and the largest nearly doubling the 8840HX's score. The 9950X's 16 cores, 32 threads, 5.70 GHz boost, and Zen 5 architecture deliver a level of compute throughput that the 8840HX cannot match.

However, the 8840HX is not without its place. It is a mobile processor with a 55W TDP, compared to the 9950X's 170W, and it uses the AMD Socket FL1, which is designed for laptops. The 9950X uses the desktop AM5 socket. The 8840HX also has a lower base clock (2.90 GHz vs 4.30 GHz) and a lower boost clock (5.10 GHz vs 5.70 GHz). For users who need a high-performance processor in a mobile form factor, the 8840HX is the only one of the two that fits that requirement. But from a pure benchmark standpoint, the 9950X wins every test.

The verdict is straightforward: choose the 9950X for maximum performance, especially in multi-threaded, compute-intensive, and single-threaded tasks. Choose the 8840HX only if the mobile form factor and lower power draw are non-negotiable, because the benchmark data offers no performance reason to prefer it.

Where Each One Wins

Given that the 9950X wins all 13 head-to-head benchmarks, the "where each one wins" section is one-sided. The 9950X wins in every category: multi-threaded rendering (Cinebench R23), single-threaded responsiveness (Cinebench R23 single-core, Passmark single-thread), data compression, encryption, extended instructions, floating point math, integer math, physics, random string sorting, and prime number finding. There is no workload in the database where the 8840HX takes the lead.

The 8840HX's advantages are not in benchmark scores but in its physical and power characteristics. It has a 55W TDP versus 170W, making it suitable for thin-and-light laptops. It uses the FL1 socket, which is a mobile platform, and its integrated graphics is the Radeon 610M, while the 9950X has a generic Radeon Graphics. The 8840HX also has more PCIe lanes (28 vs 24) and a newer release date (2025-04-22 vs 2024-08-14). But these are not performance wins; they are design trade-offs.

For users who prioritize raw performance, the 9950X is the only choice. For users who need a processor that can fit in a laptop and run on 55W, the 8840HX is the only option of the two. The data shows no scenario where the 8840HX outperforms the 9950X in any of the recorded tests.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 9950X has 16 cores and 32 threads, while the AMD Ryzen 7 8840HX has 12 cores and 24 threads.

Q: What are the boost clock speeds?

A: The 9950X boosts up to 5.70 GHz, the 8840HX up to 5.10 GHz.

Q: How large is the multi-core performance gap?

A: In Cinebench R23 multi-core, the 9950X scores 40,924 versus 25,265 for the 8840HX, a 62% difference.

Q: Which has better single-thread performance?

A: The 9950X leads by 18.6% in Cinebench R23 single-core (2,202 vs 1,857) and by 19.7% in Passmark single-thread (4,737 vs 3,958).

Q: What are their TDPs?

A: The 9950X has a 170W TDP, the 8840HX has a 55W TDP.

Q: Which processor is newer?

A: The 8840HX was released on 2025-04-22, while the 9950X was released on 2024-08-14.

Architecture Differences

The two processors are built on different architectures and process nodes. The 9950X uses Zen 5 (codename Granite Ridge) on a 4nm process, while the 8840HX uses Zen 4 (codename Dragon Range) on a 5nm process. Both are manufactured by TSMC, but the 9950X packs 16,630 million transistors across a die size of 2x 70.6 mm², whereas the 8840HX has 13,140 million transistors on a 2x 71 mm² die.

Cache hierarchies differ as well. The 9950X has 80 KB of L1 cache per core, while the 8840HX has 64 KB per core. Both have 1 MB of L2 per core and 64 MB of L3, but the 8840HX's L3 is described as "shared" while the 9950X's is simply "64 MB". Memory bandwidth is higher on the 9950X at 89.6 GB/s versus 83.2 GB/s, though both support DDR5 and dual-channel memory.

ECC memory support is present on the 9950X but not on the 8840HX. PCIe connectivity also differs: the 9950X offers Gen 5 with 24 lanes (CPU only), while the 8840HX offers Gen 5 with 28 lanes. Integrated graphics are different: the 9950X has Radeon Graphics, the 8840HX has Radeon 610M. The 9950X is a desktop part on AMD Socket AM5, while the 8840HX is a mobile part on AMD Socket FL1.

Specification Differences

The following specifications differ between the two processors:

• Cores: 16 (9950X) vs 12 (8840HX)
• Threads: 32 vs 24
• Base clock: 4.30 GHz vs 2.90 GHz
• Boost clock: 5.70 GHz vs 5.10 GHz
• TDP: 170W vs 55W
• Socket: AM5 vs FL1
• Architecture: Zen 5 vs Zen 4
• Codename: Granite Ridge vs Dragon Range
• Process node: 4 nm vs 5 nm
• Transistors: 16,630 million vs 13,140 million
• Die size: 2x 70.6 mm² vs 2x 71 mm²
• L1 cache: 80 KB per core vs 64 KB per core
• L3 cache: 64 MB vs 64 MB (shared)
• Memory bandwidth: 89.6 GB/s vs 83.2 GB/s
• ECC support: true vs false
• PCIe lanes: 24 vs 28
• Integrated graphics: Radeon Graphics vs Radeon 610M
• Market segment: Desktop vs Mobile
• Release date: 2024-08-14 vs 2025-04-22
• Launch MSRP: $649 vs none
• Part number: 100-000001277 vs 100-000001850

Both processors share the same L2 cache (1 MB per core), memory support (DDR5), memory bus (dual-channel), multiplier unlock, and production status (Active).