AMD Ryzen 7 8840HX vs AMD Ryzen 9 7950X Comparison

The AMD Ryzen 7 8840HX and AMD Ryzen 9 7950X present a classic mobile-versus-desktop showdown, and the benchmark data is unambiguous: the Ryzen 9 7950X wins every single head-to-head test, 13 out of 13. The largest margins come in heavily multithreaded workloads, where the desktop chip’s extra cores translate into massive performance leads. For instance, in Cinebench R23 multi-core, the 7950X scores 36,523 against the 8840HX’s 25,265, a 30.8% advantage. The gap is even wider in PassMark’s data compression test, where the 7950X hits 835,923 versus 496,427, a 40.6% lead. Similarly, extended instructions show a 41.2% delta (62,131 vs 36,527), and random string sorting is 41.1% faster (98,501 vs 57,971). These are not marginal differences; they represent a full performance tier between the two.

The single-threaded picture is closer, but the 7950X still holds a clear edge. In Cinebench R23 single-core, the 7950X scores 2,000 against the 8840HX’s 1,857, a 7.1% improvement. PassMark single-thread results echo this, with 4,266 versus 3,958, a 7.2% delta. Even the more specialized PassMark physics test shows a 29.6% gap (3,102 vs 2,185), indicating the desktop part’s higher sustained clocks and power envelope dominate across the board. The 8840HX does not win a single benchmark, so there is no “biggest win” for the mobile chip to highlight; its only consolation is that its scores are respectable for a 55W TDP part, but the data shows it simply cannot compete with the 170W desktop flagship.

Architecture Differences

Both processors are built on the same fundamental Zen 4 architecture and 5nm TSMC process node, which explains their identical 13,140 million transistor counts and 2x 71 mm² die sizes. They also share the same cache hierarchy: 64 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3. Memory support is likewise identical, with dual-channel DDR5 and a memory bandwidth of 83.2 GB/s. The core-count difference is the primary architectural split: the 8840HX has 12 cores and 24 threads, while the 7950X has 16 cores and 32 threads. That 33% increase in core count for the 7950X directly explains its multi-threaded dominance.

The clock speeds tell a similar story. The 8840HX has a base clock of 2.90 GHz and a boost of 5.10 GHz, while the 7950X runs at 4.50 GHz base and 5.70 GHz boost. The desktop part’s higher base clock is particularly significant, as it indicates sustained performance under load, whereas the mobile chip’s lower base reflects its 55W TDP constraint versus the 7950X’s 170W TDP. Both have unlocked multipliers, allowing overclocking, but the 7950X starts from a much higher baseline. The integrated graphics also differ: the 8840HX uses a Radeon 610M, while the 7950X has a generic Radeon Graphics solution. PCIe support is another differentiator, with the 8840HX offering Gen 5 with 28 lanes (CPU only) versus the 7950X’s Gen 5 with 24 lanes (CPU only).

The sockets and platforms are entirely different. The 8840HX uses AMD Socket FL1 and is part of the 8000 series, codenamed Dragon Range, targeting the mobile market. The 7950X uses AMD Socket AM5, belongs to the 7000 series with the Raphael codename, and is a desktop part. The 7950X also supports ECC memory, while the 8840HX does not. Release dates are far apart: the 8840HX launched on 2025-04-22, whereas the 7950X arrived on 2022-09-26. Both are listed as Active in production status.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen 9 7950X has 16 cores and 32 threads, while the AMD Ryzen 7 8840HX has 12 cores and 24 threads.

Q: How does the single-core performance compare?

A: The 7950X leads in single-core tests. In Cinebench R23 single-core, it scores 2,000 versus the 8840HX’s 1,857, a 7.1% advantage. PassMark single-thread results show a similar 7.2% lead, with scores of 4,266 and 3,958 respectively.

Q: What is the TDP difference between the two?

A: The 8840HX has a 55W TDP, while the 7950X has a 170W TDP. This indicates the mobile chip is designed for power efficiency, while the desktop part prioritizes raw performance.

Q: Do both CPUs support DDR5 memory?

A: Yes, both support dual-channel DDR5 memory with a memory bandwidth of 83.2 GB/s. However, the 7950X also supports ECC memory, which the 8840HX does not.

Q: Are these CPUs on the same manufacturing process?

A: Yes, both are built on the 5nm process from TSMC, with identical transistor counts of 13,140 million and die sizes of 2x 71 mm².

Q: What are the PCIe lane counts?

A: The 8840HX has Gen 5 with 28 lanes (CPU only), while the 7950X has Gen 5 with 24 lanes (CPU only).

The Verdict

The data is clear: the AMD Ryzen 9 7950X is the superior processor in every measured benchmark, winning all 13 head-to-head tests. Its 30.8% lead in Cinebench R23 multi-core (36,523 vs 25,265) and 40.6% lead in data compression (835,923 vs 496,427) make it the obvious choice for any workload that scales with core count and sustained clock speeds. Even in single-threaded tests, where the gap narrows, the 7950X still holds a 7.1% edge in Cinebench R23 single-core (2,000 vs 1,857). The 8840HX’s only advantages are its 55W TDP and mobile socket, which make it suitable for laptops, but from a pure performance perspective, it loses every comparison.

The 7950X also has a higher percentile ranking among all CPUs, sitting in the 94th percentile, matching the 8840HX. However, its average benchmark score of 69,515 is lower than the 8840HX’s 71,797, which is notable given the 7950X’s wins in every head-to-head test. This discrepancy suggests the 8840HX performs well in other benchmarks not covered in the head-to-head list, but for the specific tests where both are measured, the 7950X is unequivocally faster. The 7950X launched with an MSRP of $699, but that is the only pricing detail available.

Specification Differences

The following specifications differ between the two processors:

• Cores: 12 (8840HX) vs 16 (7950X)
• Threads: 24 (8840HX) vs 32 (7950X)
• Base Clock: 2.90 GHz (8840HX) vs 4.50 GHz (7950X)
• Boost Clock: 5.10 GHz (8840HX) vs 5.70 GHz (7950X)
• TDP: 55W (8840HX) vs 170W (7950X)
• Socket: AMD Socket FL1 (8840HX) vs AMD Socket AM5 (7950X)
• Codename: Dragon Range (8840HX) vs Raphael (7950X)
• Series: 8000 series (8840HX) vs 7000 series (7950X)
• Integrated Graphics: Radeon 610M (8840HX) vs Radeon Graphics (7950X)
• PCIe Lanes: Gen 5, 28 Lanes (8840HX) vs Gen 5, 24 Lanes (7950X)
• ECC Memory: No (8840HX) vs Yes (7950X)
• Market Segment: Mobile (8840HX) vs Desktop (7950X)
• Release Date: 2025-04-22 (8840HX) vs 2022-09-26 (7950X)
• Part Number: 100-000001850 (8840HX) vs 100-000000514 (7950X)
• Launch MSRP: None (8840HX) vs $699 (7950X)

Where Each One Wins

The AMD Ryzen 9 7950X wins in every workload category measured. For multi-core productivity, it leads by 30.8% in Cinebench R23 multi-core and by 33.2% in PassMark multithread (62,478 vs 41,732). Data-heavy tasks see even larger gaps, with a 40.6% lead in data compression and a 41.2% lead in extended instructions. Floating-point math shows a 37.1% advantage (138,004 vs 86,747), and integer math is 35.1% faster (225,603 vs 146,506). Encryption is 39.4% faster (49,336 vs 29,919), and physics is 29.6% faster (3,102 vs 2,185). Even in single-threaded workloads, the 7950X wins, with a 7.1% edge in Cinebench R23 single-core and 7.2% in PassMark single-thread. Prime number finding is the closest test, but the 7950X still wins by 9.8% (337 vs 304).

The AMD Ryzen 7 8840HX does not win any benchmark in the head-to-head data. Its value lies in its mobile platform, with a 55W TDP, FL1 socket, and 28 PCIe Gen 5 lanes, which are suited for high-end laptops. However, when comparing raw performance, the 7950X is the definitive choice for desktop users who need maximum throughput. The 8840HX’s higher average benchmark score (71,797 vs 69,515) suggests it performs well in other tests, but in every directly compared metric, the 7950X is ahead. For users building a desktop workstation or gaming rig, the 7950X is the clear pick. For those requiring a mobile solution, the 8840HX offers competitive performance within its power budget, but it cannot match the desktop chip’s output.