AMD Ryzen 9 8945HX vs AMD Ryzen 9 9950X Comparison

The AMD Ryzen 9 9950X and the AMD Ryzen 9 8945HX are both 16-core, 32-thread parts, but they target completely different platforms. The 9950X is a desktop flagship built on Zen 5 for Socket AM5, while the 8945HX is a mobile powerhouse on Zen 4 for Socket FL1. The benchmark data reveals a clear split: the desktop chip dominates in raw throughput and single-threaded performance, while the mobile chip shows surprising strength in certain rendering workloads.

Head-to-Head Benchmarks

The data shows a decisive victory for the Ryzen 9 9950X in most head-to-head comparisons, taking 12 of 15 benchmark wins. The largest margin comes in Cinebench R15 multi-core, where the 9950X scores 6335 against the 8945HX’s 4305, a massive 47.2% advantage. This is the desktop chip’s most significant win, reflecting its higher base clock of 4.30 GHz and boost clock of 5.70 GHz, compared to the mobile chip’s 2.50 GHz base and 5.40 GHz boost.

The 9950X also flexes its muscle in PassMark’s physics test, posting 3279 versus 2168, a 51.2% lead. Extended instructions follow closely, with the 9950X at 71564 beating the 8945HX’s 49823 by 43.6%. Data compression is another strong showing, with the 9950X scoring 896544 against 677755, a 32.3% gap. Floating-point math also favors the desktop part, 159063 versus 117453, a 35.4% advantage. Integer math rounds out the heavy lifting, with the 9950X at 242097 compared to 195180, a 24% lead.

The 9950X wins the multi-threaded PassMark test with 66030 versus 51405, a 28.5% margin. Single-thread performance in PassMark also goes to the desktop chip, 4737 versus 3907, a 21.2% lead. Encryption is closer, with the 9950X at 44366 versus 40836, an 8.6% edge. Find prime numbers shows a 31.7% advantage for the 9950X, 345 versus 262. Random string sorting is also won by the desktop part, 94368 versus 78781, a 19.8% gap.

However, the story flips in Cinebench. The 8945HX wins Cinebench R23 multi-core with a score of 42713 against the 9950X’s 40924, a 4.2% advantage. This is a notable upset, as the mobile chip outperforms the desktop flagship in this specific rendering test. Even more striking is Cinebench R23 single-core, where the 8945HX scores 6030 versus the 9950X’s 2202, a staggering 63.5% lead. The mobile chip also wins Cinebench R15 single-core, 607 versus 344, a 43.3% margin. These single-core results are anomalous given the 9950X’s higher clock speeds, suggesting the benchmark data may reflect thermal or power characteristics specific to the test environment.

The Verdict

The Ryzen 9 9950X is the clear choice for workloads that demand maximum multi-threaded throughput, as evidenced by its 47.2% lead in Cinebench R15 multi-core and 28.5% lead in PassMark multi-thread. It also wins all six PassMark math and data tests, making it the better pick for compression, encryption, and extended instruction workloads. The 9950X holds a 94th percentile ranking among all CPUs, with an average benchmark score of 74640, placing it just 0.2% behind the AMD Ryzen 7 PRO 9745 and 0.2% ahead of the AMD Ryzen AI 9 HX PRO 475.

The Ryzen 9 8945HX, despite its mobile pedigree, wins the Cinebench R23 multi-core test and dominates in Cinebench single-core tests. Its 95th percentile ranking is actually higher than the 9950X’s, and its average benchmark score of 76212 is slightly better. The closest rival to the 8945HX is the Intel Core Ultra 9 285HX, which sits just 0.1% behind, while the AMD Ryzen Threadripper PRO 9945WX is 0.4% ahead. For users who prioritize Cinebench rendering performance, the 8945HX is the data-backed winner. However, for general computing, math-heavy tasks, and data processing, the 9950X is superior.

Architecture Differences

The two chips represent different generations of AMD’s architecture. The Ryzen 9 9950X is built on Zen 5 with the Granite Ridge codename, fabricated on a 4nm process by TSMC. It houses 16,630 million transistors across a dual-die design measuring 2x 70.6 mm². The Ryzen 9 8945HX uses the older Zen 4 architecture with the Dragon Range codename, manufactured on a 5nm process. It contains 13,140 million transistors across a slightly larger dual-die layout at 2x 71 mm². This node advantage gives the 9950X a transistor density edge, contributing to its higher clock speeds.

Cache configurations differ notably. The 9950X has 80 KB of L1 cache per core, while the 8945HX has 64 KB per core. Both share 1 MB of L2 per core and 64 MB of L3 cache. The larger L1 cache on the desktop part likely helps in single-threaded tasks, though the benchmark data shows mixed results in that area. Memory bandwidth also favors the 9950X, with 89.6 GB/s versus 83.2 GB/s, both using dual-channel DDR5.

The platforms diverge significantly. The 9950X uses AMD Socket AM5 for desktop, while the 8945HX uses AMD Socket FL1 for mobile. The 9950X supports ECC memory, a feature absent on the 8945HX. PCIe lanes also differ: the 9950X offers Gen 5 with 24 lanes, while the 8945HX provides Gen 5 with 28 lanes. Integrated graphics differ as well, with the 9950X featuring Radeon Graphics and the 8945HX using a Radeon 610M. The 9950X has a TDP of 170, while the 8945HX is rated at 55, reflecting the mobile chip’s power-efficient design. Both have unlocked multipliers, but the 9950X launched with an MSRP of $649, while the 8945HX has no listed launch MSRP.

FAQ

Q: Which CPU has higher single-core performance in Cinebench R23?

A: The AMD Ryzen 9 8945HX wins Cinebench R23 single-core with a score of 6030, compared to the 9950X’s 2202, a 63.5% advantage.

Q: Which CPU is better for multi-threaded workloads?

A: It depends on the test. The 9950X wins Cinebench R15 multi-core by 47.2% and PassMark multi-thread by 28.5%, but the 8945HX wins Cinebench R23 multi-core by 4.2%.

Q: What are the core and thread counts for both CPUs?

A: Both the AMD Ryzen 9 9950X and the AMD Ryzen 9 8945HX have 16 cores and 32 threads.

Q: How do their average benchmark scores compare?

A: The 9950X has an average benchmark score of 74640, while the 8945HX has a slightly higher average of 76212.

Q: Which CPU has a higher boost clock?

A: The 9950X has a boost clock of 5.70 GHz, while the 8945HX has a boost clock of 5.40 GHz.

Q: Do both CPUs support DDR5 memory?

A: Yes, both support DDR5 memory with dual-channel memory buses, though the 9950X has higher memory bandwidth at 89.6 GB/s versus 83.2 GB/s.

Where Each One Wins

The Ryzen 9 9950X is the winner for data-heavy and computational tasks. It leads in data compression by 32.3%, data encryption by 8.6%, and extended instructions by 43.6%. It also wins in floating-point math by 35.4%, integer math by 24%, and prime number finding by 31.7%. For physics simulations, the 9950X’s 51.2% lead makes it the clear pick. Random string sorting also favors the desktop chip by 19.8%. In PassMark single-thread, the 9950X wins by 21.2%, and in multi-thread by 28.5%. The 9950X’s 94th percentile ranking and its strong showing in Cinebench R15 multi-core (47.2% lead) make it the better choice for most professional and content-creation workloads.

The Ryzen 9 8945HX wins specifically in Cinebench tests. It takes Cinebench R23 multi-core by 4.2% and dominates both single-core tests, with a 63.5% lead in R23 single-core and a 43.3% lead in R15 single-core. Despite its lower base and boost clocks, the 8945HX’s 95th percentile ranking and higher average benchmark score suggest it holds its own in rendering applications. For users who heavily rely on Cinebench for CPU evaluation or rendering tasks, the 8945HX is the data-backed winner. Its mobile design, with a 55 TDP, also makes it suitable for laptops, though the benchmark data does not include power efficiency metrics.