AMD Ryzen 9 9900X3D vs AMD Ryzen AI 7 345 Comparison

The AMD Ryzen 9 9900X3D and the AMD Ryzen AI 7 345 occupy different segments of the processor market, yet both are active products from the same manufacturer. The Ryzen 9 9900X3D is a desktop part with a 120 TDP, 12 cores, and 24 threads, while the Ryzen AI 7 345 is a mobile processor with a 28 TDP, 6 cores, and 12 threads. The recorded benchmarks show a complete dominance by the desktop chip in every single test, but the magnitude of those wins varies significantly by workload. The Ryzen 9 9900X3D claims all 15 head-to-head victories, while the Ryzen AI 7 345 records zero wins. The average benchmark score for the Ryzen 9 9900X3D is 54762, placing it in the 91st percentile of all CPUs in the database. The Ryzen AI 7 345 has an average score of 29461, which puts it in the 81st percentile. This gap of roughly 86% in average score is reflected across the individual tests, though some workloads show a much tighter race than others.

Head-to-Head Benchmarks

The most dramatic single result comes from the PassMark find prime numbers test. The Ryzen 9 9900X3D scores 544, while the Ryzen AI 7 345 scores 62, producing a delta of 777.4% in favor of the desktop processor. This is by far the largest percentage gap in the entire comparison, indicating that the Ryzen 9 9900X3D has a massive advantage in integer-heavy prime number calculations. The nearest rival data for the Ryzen 9 9900X3D shows it is essentially tied with the Intel Core Ultra 5 245KF, which has an average score of 55093 and a delta of -0.6%. The Ryzen AI 7 345, meanwhile, sits almost exactly level with the AMD Ryzen 7 3800X, which has an average score of 29447 and a delta of 0%. This context shows that the Ryzen 9 9900X3D is competing at a much higher absolute performance tier, while the Ryzen AI 7 345 is positioned against older desktop parts and mid-range mobile chips.

In Cinebench R23 multi-core, the Ryzen 9 9900X3D scores 47737 against 11461 for the Ryzen AI 7 345, a delta of 316.5%. This is the second-largest gap and reflects the massive core and thread advantage of the desktop part. The single-core Cinebench R23 result shows a delta of 270.7%, with the Ryzen 9 9900X3D scoring 6739 and the Ryzen AI 7 345 scoring 1818. These two tests demonstrate that the Ryzen 9 9900X3D does not just win on multi-threaded workloads; it also has a substantial lead in single-threaded rendering performance. The Cinebench R15 results follow the same pattern, with a 181% delta in multi-core (4811 vs 1712) and a 150.6% delta in single-core (679 vs 271).

The PassMark physics test shows a delta of 390.4%, with the Ryzen 9 9900X3D scoring 5340 and the Ryzen AI 7 345 scoring 1089. This test is often associated with gaming physics simulations, and the large gap here suggests that the Ryzen 9 9900X3D will handle such workloads with considerably more headroom. The extended instructions test shows a delta of 226%, with scores of 55426 and 17003 respectively. This indicates that the Ryzen 9 9900X3D is far more capable in workloads that utilize AVX or similar instruction sets, which are common in scientific computing and content creation.

Several PassMark tests show deltas in the 180% to 188% range. These include data compression (685074 vs 237484, delta 188.5%), data encryption (33282 vs 11814, delta 181.7%), floating point math (119622 vs 42621, delta 180.7%), integer math (179727 vs 63475, delta 183.1%), multithread (56154 vs 19927, delta 181.8%), and random string sorting (71864 vs 25435, delta 182.5%). These consistent deltas suggest that for most general-purpose computing tasks, the Ryzen 9 9900X3D delivers roughly 2.8 to 2.9 times the performance of the Ryzen AI 7 345. The one notable exception is the PassMark single-thread test, where the delta is only 19.9%. The Ryzen 9 9900X3D scores 4646, while the Ryzen AI 7 345 scores 3875. This is the only test where the two processors are in a similar performance class, indicating that the Ryzen AI 7 345 has a respectable single-thread design despite its lower core count and clock speeds.

Where Each One Wins

The Ryzen 9 9900X3D wins every recorded benchmark, so the analysis is about the degree of advantage rather than the direction. The largest wins for the Ryzen 9 9900X3D come in multi-core rendering, physics simulation, and extended instruction workloads. The Cinebench R23 multi-core result of 47737 versus 11461 shows that the Ryzen 9 9900X3D is over four times faster in this heavily threaded workload. This is the kind of result that matters for video encoding, 3D rendering, and software compilation. The PassMark physics score of 5340 versus 1089 indicates a similar magnitude of advantage in physics-heavy applications, which are common in modern game engines and some scientific simulations. The extended instructions score of 55426 versus 17003 shows that the Ryzen 9 9900X3D has a significant edge in workloads that can use SIMD instructions, such as image processing and audio encoding.

The Ryzen AI 7 345 does not win any test, but the closest relative result is in the PassMark single-thread test. The delta of 19.9% means that for lightly threaded applications, the Ryzen AI 7 345 is only about one-fifth slower than the Ryzen 9 9900X3D. This is a meaningful data point for users who run applications that rely heavily on single-core performance, such as older games or certain productivity tools. The Ryzen AI 7 345 also shows a relatively strong showing in the Cinebench R15 single-core test, where the delta is 150.6% compared to the multi-core delta of 181%. This suggests that the mobile chip's single-core efficiency is its best attribute relative to the desktop part.

For the Ryzen AI 7 345, the data shows that its strength lies in efficiency rather than raw performance. With a 28 TDP compared to the 120 TDP of the Ryzen 9 9900X3D, the mobile chip delivers a substantial fraction of the desktop performance per watt, although the database does not include direct power efficiency measurements. The single-thread score of 3875 is within 20% of the Ryzen 9 9900X3D, which is remarkable given the difference in power envelopes and clock speeds. The Ryzen AI 7 345 also has a higher average benchmark score than its nearest rivals, sitting at 29461 versus 29447 for the AMD Ryzen 7 3800X and 29409 for the AMD EPYC 9654, indicating that it is a well-balanced mobile processor.

Architecture Differences

The Ryzen 9 9900X3D uses the Zen 5 architecture with the Granite Ridge codename, while the Ryzen AI 7 345 uses a hybrid configuration of Zen 5 and Zen 5c cores under the Krackan Point codename. Both are built on the 4 nm process node from TSMC, but the Ryzen 9 9900X3D has a transistor count of 16,630 million and a die size of 2x 70.6 mm². The Ryzen AI 7 345 does not have recorded transistor or die size data in the database. The Ryzen 9 9900X3D has 12 cores and 24 threads, while the Ryzen AI 7 345 has 6 cores and 12 threads. The base clock of the Ryzen 9 9900X3D is 4.40 GHz, and its boost clock is 5.50 GHz. The Ryzen AI 7 345 has a base clock of 2.00 GHz and a boost clock of 4.60 GHz. This clock difference, combined with the core count difference, explains much of the performance gap in multi-threaded workloads.

The cache configurations are dramatically different. The Ryzen 9 9900X3D has 80 KB of L1 cache per core, 1 MB of L2 cache per core, and 128 MB of L3 cache. The Ryzen AI 7 345 also has 80 KB of L1 cache per core and 1 MB of L2 cache per core, but its L3 cache is only 4 MB. The 128 MB L3 cache on the Ryzen 9 9900X3D is a defining feature, as it is much larger than what is typical for a desktop processor and is designed to reduce memory latency in gaming and cache-sensitive workloads. The Ryzen AI 7 345 does not have a dedicated 3D V-Cache, whereas the Ryzen 9 9900X3D includes this feature, which is reflected in the larger L3 capacity.

Memory support also differs. The Ryzen 9 9900X3D supports DDR5 memory with a dual-channel bus and a memory bandwidth of 89.6 GB/s. The Ryzen AI 7 345 supports DDR5 and LPDDR5X memory, also with a dual-channel bus and the same memory bandwidth of 89.6 GB/s. The Ryzen 9 9900X3D supports ECC memory, while the Ryzen AI 7 345 does not. PCIe connectivity is another differentiator: the Ryzen 9 9900X3D uses Gen 5 with 24 lanes (CPU only), while the Ryzen AI 7 345 uses Gen 4 with 14 lanes (CPU only). The Ryzen 9 9900X3D has a Radeon Graphics integrated GPU, while the Ryzen AI 7 345 has a Radeon 840M integrated GPU. The Ryzen 9 9900X3D is unlocked for overclocking, while the Ryzen AI 7 345 is locked. The socket types are also different: the Ryzen 9 9900X3D uses AMD Socket AM5, and the Ryzen AI 7 345 uses AMD Socket FP8.

FAQ

Q: Which processor has a higher single-thread score in PassMark?

A: The Ryzen 9 9900X3D scores 4646, while the Ryzen AI 7 345 scores 3875. The delta is 19.9% in favor of the Ryzen 9 9900X3D.

Q: What is the difference in L3 cache size between the two?

A: The Ryzen 9 9900X3D has 128 MB of L3 cache, while the Ryzen AI 7 345 has 4 MB of L3 cache.

Q: Do both processors support ECC memory?

A: No. The Ryzen 9 9900X3D supports ECC memory, while the Ryzen AI 7 345 does not.

Q: How do the two compare in Cinebench R23 multi-core?

A: The Ryzen 9 9900X3D scores 47737, and the Ryzen AI 7 345 scores 11461, resulting in a delta of 316.5% in favor of the Ryzen 9 9900X3D.

Q: Are both processors built on the same process node?

A: Yes, both are built on a 4 nm process node from TSMC.

Q: Which processor has a higher boost clock?

A: The Ryzen 9 9900X3D has a boost clock of 5.50 GHz, while the Ryzen AI 7 345 has a boost clock of 4.60 GHz.

The Verdict

The data clearly shows that the Ryzen 9 9900X3D is the superior processor in every measured benchmark. For users who need maximum multi-core performance, the Cinebench R23 multi-core score of 47737 versus 11461 is decisive. The Ryzen 9 9900X3D is also the clear choice for physics-heavy workloads, as shown by the PassMark physics score of 5340 versus 1089. The 128 MB L3 cache and 12 cores make it suitable for demanding desktop applications, and its 91st percentile ranking among all CPUs confirms its high-end position. The launch MSRP for the Ryzen 9 9900X3D is $599, which the database records as its only pricing data point.

The Ryzen AI 7 345, while slower in absolute terms, has its own role. Its closest benchmark result is the PassMark single-thread test, where it trails by only 19.9%. This means that for everyday tasks and single-threaded applications, the experience will be much closer than the multi-core deltas suggest. Its 28 TDP makes it a low-power mobile processor, and its 81st percentile ranking shows that it is still a competent performer relative to the broader CPU market. The Ryzen AI 7 345 supports LPDDR5X memory, which is a feature absent from the Ryzen 9 9900X3D, and its Radeon 840M integrated GPU is a different graphics solution. For a mobile user who prioritizes battery life and portability over raw throughput, the Ryzen AI 7 345 is the only viable option between these two, as the Ryzen 9 9900X3D is a desktop part with a 120 TDP and no mobile form factor.

Specification Differences

The following specifications differ between the two processors:

| Specification | AMD Ryzen 9 9900X3D | AMD Ryzen AI 7 345 |

|---------------|---------------------|--------------------|

| Cores | 12 | 6 |

| Threads | 24 | 12 |

| Base Clock | 4.40 GHz | 2.00 GHz |

| Boost Clock | 5.50 GHz | 4.60 GHz |

| TDP | 120 | 28 |

| Socket | AMD Socket AM5 | AMD Socket FP8 |

| Codename | Granite Ridge | Krackan Point |

| L3 Cache | 128 MB | 4 MB |

| Memory Support | DDR5 | DDR5, LPDDR5X |

| ECC Memory | Yes | No |

| PCIe | Gen 5, 24 Lanes (CPU only) | Gen 4, 14 Lanes (CPU only) |

| Integrated Graphics | Radeon Graphics | Radeon 840M |

| Market Segment | Desktop | Mobile |

| Launch MSRP | $599 | Null |

| Multiplier Unlocked | Yes | No |

| Part Number | 100-000001368 | 100-000002122 |

| Transistors | 16,630 million | Null |

| Die Size | 2x 70.6 mm² | Null |