AMD Ryzen 9 9900X3D vs AMD Ryzen AI 5 PRO 440 Comparison

Where Each One Wins

The recorded data shows a completely one-sided matchup. The AMD Ryzen 9 9900X3D wins all 11 head-to-head benchmark comparisons against the AMD Ryzen AI 5 PRO 440. There is not a single test in the shared PassMark suite where the mobile processor takes the lead. This makes the use-case split straightforward: the Ryzen 9 9900X3D is the choice for every workload represented in the database, while the Ryzen AI 5 PRO 440 has no recorded benchmark victory.

The largest disparities appear in compute-heavy and parallel workloads. The Ryzen 9 9900X3D leads by 606.5% in prime number finding, 377.2% in physics simulation, and 200.3% in extended instruction throughput. These are workloads that scale aggressively with core count, cache capacity, and clock speed. The Ryzen 9 9900X3D, with 12 cores and 24 threads, simply has more resources to throw at these tasks.

The smallest delta is in single-threaded performance. The Ryzen 9 9900X3D scores 4646 against 3785 for the Ryzen AI 5 PRO 440, a 22.7% advantage. This is still a decisive win, but it shows that the gap narrows when the workload is limited to one core. Both processors use the same Zen 5 architecture, so the single-thread advantage comes down to clock speed: the Ryzen 9 9900X3D boosts to 5.50 GHz, while the Ryzen AI 5 PRO 440 reaches 4.80 GHz.

For mobile users, the Ryzen AI 5 PRO 440 still performs well in absolute terms. Its average benchmark score of 41208 places it in the 87th percentile of all CPUs in the database. It sits within 0.6% of the Intel Core Ultra X7 358H and within 0.4% of the AMD Ryzen 9 5900X. The issue is not that the mobile chip is weak; it is that the desktop chip is exceptionally strong. The Ryzen 9 9900X3D scores in the 91st percentile overall, and its nearest rival, the Intel Core Ultra 5 245KF, trails it by just 0.6%. The desktop part is a much higher performer by any measure.

Architecture Differences

Both processors are built on the Zen 5 architecture and manufactured on a 4 nm process at TSMC. This is where the similarities end. The Ryzen 9 9900X3D uses the Granite Ridge codename and belongs to the Ryzen 9 generation, while the Ryzen AI 5 PRO 440 uses the Gorgon Point codename and belongs to the Ryzen AI PRO 400 generation, which mixes Zen 5 and Zen 5c cores.

The transistor counts differ dramatically. The Ryzen 9 9900X3D packs 16,630 million transistors across a dual-die design with two 70.6 mm² chiplets. The Ryzen AI 5 PRO 440 has no recorded transistor count but uses a single 195 mm² die. The desktop processor is a chiplet design, while the mobile processor is monolithic.

Cache configuration is a major differentiator. Both chips have 80 KB of L1 cache per core and 1 MB of L2 cache per core. The L3 cache is where the gap opens: the Ryzen 9 9900X3D has 128 MB of L3 cache, while the Ryzen AI 5 PRO 440 has only 8 MB. This 16x difference in L3 capacity is central to the desktop part's performance advantage, particularly in workloads that repeatedly access large datasets.

The memory and I/O interfaces also differ. Both support DDR5 with dual-channel memory buses and 89.6 GB/s of bandwidth, but the Ryzen AI 5 PRO 440 adds LPDDR5X support. The Ryzen 9 9900X3D uses PCIe Gen 5 with 24 CPU lanes, while the Ryzen AI 5 PRO 440 uses PCIe Gen 4 with 16 CPU lanes. The desktop part supports ECC memory, and so does the mobile part, but the integrated graphics differ: the Ryzen 9 9900X3D has Radeon Graphics, while the Ryzen AI 5 PRO 440 has the Radeon 840M.

The market segments are entirely different. The Ryzen 9 9900X3D targets desktop systems with an AMD Socket AM5, a 120 TDP, and an unlocked multiplier. The Ryzen AI 5 PRO 440 targets mobile systems with an AMD Socket FP8, a 28 TDP, and a locked multiplier. The release dates are also far apart: the desktop part launched in January 2025, while the mobile part is dated January 2026.

Head-to-Head Benchmarks

The head-to-head data covers 11 PassMark tests, and the Ryzen 9 9900X3D wins every one. The most extreme result is in prime number finding, where the desktop chip scores 544 against 77, a 606.5% advantage. This test is highly sensitive to raw integer throughput and cache behavior, and the Ryzen 9 9900X3D dominates it.

Physics simulation shows the second-largest gap. The Ryzen 9 9900X3D scores 5340, while the Ryzen AI 5 PRO 440 scores 1119, a 377.2% difference. This workload benefits from multi-threaded scaling, and the 12-core, 24-thread desktop part crushes the 6-core, 12-thread mobile part.

Extended instructions show a 200.3% lead for the Ryzen 9 9900X3D, with scores of 55426 versus 18456. Floating-point math follows at 178.6% (119622 versus 42934), and integer math at 172.4% (179727 versus 65991). Data encryption shows a 168% lead (33282 versus 12418), and data compression shows a 167.2% lead (685074 versus 256420). The multithread test shows a 166.7% lead (56154 versus 21054), and random string sorting shows a 163.7% lead (71864 versus 27252).

The narrowest margin is in single-threaded performance. The Ryzen 9 9900X3D scores 4646, and the Ryzen AI 5 PRO 440 scores 3785, a 22.7% lead. This is still a substantial gap, but it is the only test where the difference drops below triple digits. The single-thread test appears twice in the data (as passmark_single_thread and passmark_singlethread), and both entries show identical scores and deltas.

For context, the Ryzen 9 9900X3D's average benchmark score is 54762, which puts it 0.6% behind the Intel Core Ultra 5 245KF and 1.3% ahead of the Intel Core Ultra 5 245K. The Ryzen AI 5 PRO 440's average score of 41208 places it exactly level with the Intel Core Ultra 7 356H, 0.1% ahead of the Intel Core Ultra 7 366H, and 0.4% ahead of the AMD Ryzen 9 5900X. The desktop part competes at the top of the desktop stack, while the mobile part competes near the top of the mobile stack, but the two stacks are far apart.

Specification Differences

The core and thread counts are the most obvious difference. The Ryzen 9 9900X3D has 12 cores and 24 threads, while the Ryzen AI 5 PRO 440 has 6 cores and 12 threads. Clock speeds also favor the desktop part: base clock of 4.40 GHz versus 2.00 GHz, and boost clock of 5.50 GHz versus 4.80 GHz.

The TDP figures reflect their different roles. The Ryzen 9 9900X3D has a 120 TDP, while the Ryzen AI 5 PRO 440 has a 28 TDP. The desktop part consumes far more power and is designed for systems with active cooling, while the mobile part is built for laptops and other power-constrained devices.

The sockets are incompatible: AMD Socket AM5 for the desktop part, AMD Socket FP8 for the mobile part. The process nodes are identical at 4 nm from TSMC, but the die designs differ. The Ryzen 9 9900X3D uses a dual-die layout with 2x 70.6 mm² dies, while the Ryzen AI 5 PRO 440 uses a single 195 mm² die.

L3 cache is a decisive specification difference. The Ryzen 9 9900X3D has 128 MB, and the Ryzen AI 5 PRO 440 has 8 MB. L1 and L2 caches are identical per core at 80 KB and 1 MB respectively, but the total cache pool is vastly different due to the core count and the L3 allocation.

PCIe support also differs. The Ryzen 9 9900X3D offers Gen 5 with 24 CPU lanes, while the Ryzen AI 5 PRO 440 offers Gen 4 with 16 CPU lanes. Memory support is similar with DDR5 and dual-channel, but the mobile part adds LPDDR5X. Both support ECC. The integrated graphics differ: Radeon Graphics for the desktop part, Radeon 840M for the mobile part.

The multiplier is unlocked on the Ryzen 9 9900X3D and locked on the Ryzen AI 5 PRO 440. This means the desktop part can be overclocked, while the mobile part cannot. The desktop part also has a recorded launch MSRP of $599, which the database lists once. The mobile part has no launch MSRP recorded.

FAQ

Q: Which processor has more cores and threads?

A: The AMD Ryzen 9 9900X3D has 12 cores and 24 threads, while the AMD Ryzen AI 5 PRO 440 has 6 cores and 12 threads.

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

A: The largest gap is in the prime number finding test, where the Ryzen 9 9900X3D leads by 606.5% with a score of 544 versus 77.

Q: How do the L3 cache sizes compare?

A: The Ryzen 9 9900X3D has 128 MB of L3 cache, while the Ryzen AI 5 PRO 440 has 8 MB. Both have 80 KB of L1 per core and 1 MB of L2 per core.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen 9 9900X3D and the Ryzen AI 5 PRO 440 support ECC memory.

Q: What is the smallest performance difference in the head-to-head tests?

A: The smallest difference is in single-threaded performance, where the Ryzen 9 9900X3D scores 4646 against 3785, a 22.7% lead.

Q: Are the two processors compatible with the same socket?

A: No. The Ryzen 9 9900X3D uses AMD Socket AM5, while the Ryzen AI 5 PRO 440 uses AMD Socket FP8.

The Verdict

The data is unambiguous. The AMD Ryzen 9 9900X3D wins every benchmark in the shared test suite, and the margins are enormous in nearly every category. The desktop part is the correct choice for any workload that demands raw compute throughput, multi-threaded scaling, or large cache capacity. Its 128 MB of L3 cache and 12-core, 24-thread configuration make it a dominant performer in the database's 91st percentile.

The AMD Ryzen AI 5 PRO 440 is a capable mobile processor in its own right, sitting in the 87th percentile and trading blows with Intel Core Ultra 7 parts. But it cannot match the Ryzen 9 9900X3D. The 22.7% single-thread gap is the closest it gets, and that is still a decisive loss. In multi-threaded workloads, the desktop part is often 160% to 200% faster.

For a desktop system where performance is the priority, the Ryzen 9 9900X3D is the clear pick. For a mobile system where power efficiency and a 28 TDP matter, the Ryzen AI 5 PRO 440 is the only option of the two, since it fits the FP8 socket and targets laptops. The choice between them is not about benchmark scores alone; it is about the target platform. The recorded data shows no scenario where the mobile part outperforms the desktop part, so any performance-driven decision goes to the Ryzen 9 9900X3D.