AMD Ryzen 9 9955HX vs AMD Ryzen AI 5 440G Comparison

Head-to-Head Benchmarks

The recorded data shows a commanding lead for the AMD Ryzen 9 9955HX across every benchmark in the comparison set. The Ryzen 9 9955HX wins all 11 head-to-head tests, with no test favoring the AMD Ryzen AI 5 440G. The margins are substantial in most workloads, though single-threaded performance is notably closer.

The largest gap appears in PassMark's find prime numbers test. The Ryzen 9 9955HX scores 287, while the Ryzen AI 5 440G scores 90, a delta of 218.9%. This workload is highly sensitive to core count and clock speed, and the 16-core flagship delivers more than triple the result of the 6-core part.

Floating point math shows a similar story. The Ryzen 9 9955HX records 136,682, compared to 45,711 for the Ryzen AI 5 440G, a 199% advantage. Integer math follows closely: 212,598 versus 71,251, a 198.4% delta. These two results indicate that the Ryzen 9 9955HX is not just faster, it is roughly three times as fast in raw arithmetic throughput.

Extended instructions tests, which measure SIMD and specialized instruction efficiency, show a 180.6% lead for the Ryzen 9 9955HX: 57,946 versus 20,648. Data encryption is also lopsided at 174.8%, with scores of 37,330 and 13,585 respectively. Data compression shows 731,998 against 292,735, a 150.1% delta, and random string sorting records 77,890 versus 31,106, a 150.4% margin.

The multithreaded PassMark score, a broad measure of parallel capability, gives the Ryzen 9 9955HX 56,171 against 23,487 for the Ryzen AI 5 440G, a 139.2% advantage. Physics simulation follows at 104.7%, with 2,720 versus 1,329.

The single-thread tests are the only place where the Ryzen AI 5 440G approaches parity. The Ryzen 9 9955HX scores 4,393, while the Ryzen AI 5 440G scores 4,060, a delta of just 8.2%. This is consistent with the boost clock difference: 5.40 GHz versus 4.80 GHz. The per-core architecture is similar, so the higher clock speed accounts for most of the gap.

The average benchmark score reinforces the overall picture. The Ryzen 9 9955HX averages 91,199, while the Ryzen AI 5 440G averages 46,187. The Ryzen 9 9955HX sits at the 96th percentile of all CPUs in the database, while the Ryzen AI 5 440G sits at the 89th percentile. Both are strong performers, but they occupy different tiers.

Looking at nearest rivals, the Ryzen 9 9955HX is 0.5% ahead of the Intel Xeon 654 (90,717) and 0.7% ahead of the AMD Ryzen AI Max+ 392 (90,541). It trails the Intel Core Ultra 7 270K Plus by 2.8% (93,785) and the Intel Xeon 6520P by 2.8% (93,786). The Ryzen AI 5 440G, meanwhile, is 0.2% ahead of the Intel Core i9-13900HX (46,098), 0.3% ahead of the Intel Core Ultra 5 235 (46,062), 0.3% ahead of the AMD Ryzen AI 9 HX 375 (46,030), and 0.5% ahead of the AMD EPYC 4364P (45,970). These figures show that both chips are competitive within their respective performance classes.

The Verdict

The data presents a clear hierarchy. The AMD Ryzen 9 9955HX is a high-end mobile processor with 16 cores and 32 threads, designed for maximum parallel throughput. Its benchmark results place it near the top of the database, within 2.8% of the strongest rivals and ahead of several server-class parts.

The AMD Ryzen AI 5 440G, with 6 cores and 12 threads, targets a different segment. Its average score of 46,187 is roughly half of the Ryzen 9 9955HX's 91,199. It competes with laptop and desktop parts like the Intel Core i9-13900HX and the AMD Ryzen AI 9 HX 375, where it holds a slim 0.2% to 0.3% edge.

For workloads that scale with core count, the Ryzen 9 9955HX is the clear choice. Multithreaded rendering, compilation, encryption, and simulation all show advantages of more than 100%. The Ryzen AI 5 440G cannot match that throughput, and no benchmark in the set suggests it should.

For single-threaded tasks, the difference narrows to 8.2%. The Ryzen 9 9955HX still wins, but the margin is modest. Users whose primary load is lightly threaded may find the Ryzen AI 5 440G sufficient, especially given its lower core count and presumably simpler platform requirements.

The Ryzen AI 5 440G does have a higher TDP rating of 65 watts, compared to 55 watts for the Ryzen 9 9955HX. This is counterintuitive given the latter's much larger core count, but the data records these as official specifications. The Ryzen 9 9955HX uses a mobile socket (FL1), while the Ryzen AI 5 440G uses a desktop socket (AM5).

Neither part has a recorded launch MSRP in the database. Both are currently marked as active production.

FAQ

Q: Which processor wins the most benchmarks in the head-to-head comparison?

A: The AMD Ryzen 9 9955HX wins all 11 head-to-head tests. The AMD Ryzen AI 5 440G wins none.

Q: What is the largest performance gap between the two?

A: The largest delta is in PassMark's find prime numbers test, where the Ryzen 9 9955HX leads by 218.9% (287 versus 90).

Q: How close is single-threaded performance?

A: The Ryzen 9 9955HX scores 4,393 in single-thread tests, while the Ryzen AI 5 440G scores 4,060, a lead of 8.2%.

Q: Where does each chip rank among all CPUs in the database?

A: The Ryzen 9 9955HX is at the 96th percentile, while the Ryzen AI 5 440G is at the 89th percentile.

Q: How do the nearest rivals compare?

A: The Ryzen 9 9955HX is 0.5% ahead of the Intel Xeon 654 and 0.7% ahead of the AMD Ryzen AI Max+ 392, but 2.8% behind the Intel Core Ultra 7 270K Plus and Intel Xeon 6520P. The Ryzen AI 5 440G is 0.2% to 0.5% ahead of its nearest rivals, including the Intel Core i9-13900HX and AMD Ryzen AI 9 HX 375.

Q: Do both processors support the same memory and ECC?

A: Yes, both support DDR5 memory on a dual-channel bus with 89.6 GB/s bandwidth, and both support ECC memory.

Specification Differences

The two processors differ in core count, thread count, clock speeds, TDP, socket, PCIe generation and lane count, integrated graphics, release date, and die size.

The Ryzen 9 9955HX has 16 cores and 32 threads, with a base clock of 2.50 GHz and a boost clock of 5.40 GHz. The Ryzen AI 5 440G has 6 cores and 12 threads, with a base clock of 2.00 GHz and a boost clock of 4.80 GHz. TDP is 55 watts for the Ryzen 9 9955HX and 65 watts for the Ryzen AI 5 440G.

The socket differs: the Ryzen 9 9955HX uses AMD Socket FL1, while the Ryzen AI 5 440G uses AMD Socket AM5. PCIe support also differs: Gen 5 with 28 lanes for the Ryzen 9 9955HX, Gen 4 with 12 lanes for the Ryzen AI 5 440G.

Integrated graphics are different: the Ryzen 9 9955HX has a Radeon 610M, while the Ryzen AI 5 440G has a Radeon 840M. The market segment is Mobile for the Ryzen 9 9955HX and Desktop for the Ryzen AI 5 440G. The release dates are January 5, 2025, and February 28, 2026, respectively.

Die size is recorded as 2x 70.6 mm² for the Ryzen 9 9955HX and 195 mm² for the Ryzen AI 5 440G. Transistor count is listed as 16,630 million for the Ryzen 9 9955HX, while the Ryzen AI 5 440G has no recorded transistor count.

Architecture Differences

The Ryzen 9 9955HX belongs to the 9000 series and uses Zen 5 architecture, with the codename Fire Range. The Ryzen AI 5 440G is part of the Ryzen AI 400 generation, using a combination of Zen 5 and Zen 5c cores, with the codename Gorgon Point. Both are manufactured on a 4 nm process by TSMC.

Cache configurations differ substantially. The Ryzen 9 9955HX has 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of shared L3 cache. The Ryzen AI 5 440G also has 80 KB of L1 per core and 1 MB of L2 per core, but only 8 MB of L3 cache. This eightfold difference in L3 capacity is a major factor in the performance gap, particularly for workloads with large working sets.

Both processors support DDR5 memory and dual-channel operation with a memory bandwidth of 89.6 GB/s. The Ryzen 9 9955HX uses a Gen 5 PCIe interface with 28 CPU lanes, while the Ryzen AI 5 440G uses Gen 4 with 12 lanes. The Ryzen 9 9955HX is built for mobile platforms, while the Ryzen AI 5 440G targets desktop systems.

The Ryzen AI 5 440G's hybrid core design, mixing Zen 5 and Zen 5c cores, is absent from the Ryzen 9 9955HX, which uses only full Zen 5 cores. This architectural choice explains the core count difference: 16 full-size cores versus 6 cores of mixed type. The Ryzen 9 9955HX's larger L3 cache and higher boost clock give it a clear advantage in sustained multithreaded workloads, while the Ryzen AI 5 440G's lower core count and smaller cache make it more suitable for lighter tasks.