AMD Ryzen 9 8945HX vs AMD Ryzen AI 7 345 Comparison

Head-to-Head Benchmarks

The recorded data shows a decisive sweep: the AMD Ryzen 9 8945HX wins all 15 head-to-head benchmark comparisons against the AMD Ryzen AI 7 345. The largest margin appears in PassMark's find prime numbers test, where the 8945HX scores 262 against 62, a 322.6% advantage. Cinebench R23 multi-core follows closely, with the 8945HX posting 42,713 versus 11,461, a 272.7% delta. These two results set the tone: the Ryzen 9 8945HX is built for heavy parallel workloads, and the Ryzen AI 7 345 is not in the same class.

Single-threaded performance tells a more nuanced story. In Cinebench R23 single-core, the 8945HX scores 6,030 versus 1,818 for the AI 7 345, a 231.7% lead. Cinebench R15 single-core shows 607 against 271, a 124% delta. However, PassMark single-thread scores are nearly identical: 3,907 for the 8945HX and 3,875 for the AI 7 345, a margin of only 0.8%. This discrepancy suggests the two Cinebench single-core results reflect workload-specific scaling, while the PassMark test indicates that the AI 7 345's Zen 5 cores can match the older Zen 4 cores in certain integer-heavy single-thread tasks.

Memory-sensitive workloads follow the multi-core pattern. PassMark data compression shows 677,755 for the 8945HX versus 237,484, a 185.4% delta. Data encryption yields 40,836 against 11,814, a 245.7% lead. Extended instructions score 49,823 versus 17,003, a 193% advantage. Floating point math lands at 117,453 versus 42,621, a 175.6% delta, while integer math reaches 195,180 against 63,475, a 207.5% gap. Random string sorting completes the set with 78,781 versus 25,435, a 209.7% margin. Every one of these workload categories shows the 8945HX delivering more than double the throughput of the AI 7 345.

The PassMark multithread score reinforces the same conclusion: 51,405 for the 8945HX against 19,927, a 158% lead. PassMark physics shows 2,168 versus 1,089, a 99.1% delta, the narrowest multi-core margin in the dataset yet still a clear win. The overall average benchmark score reflects the gap: 76,212 for the 8945HX versus 29,461 for the AI 7 345. In percentile terms, the 8945HX ranks at the 95th percentile of all CPUs, while the AI 7 345 sits at the 81st percentile.

The nearest rival data places the 8945HX among high-end desktop and mobile parts. Its average score of 76,212 is 0.1% above the Intel Core Ultra 9 285HX, 0.4% above the AMD EPYC Embedded 8224P, and 0.6% above the AMD Ryzen 9 9950X3D, while trailing the AMD Ryzen Threadripper PRO 9945WX by 0.4%. The AI 7 345, by contrast, sits at 29,461, effectively tied with the AMD Ryzen 7 3800X (0% delta), 0.2% above the AMD EPYC 9654, 0.7% above the Intel Core i5-13500HX, and 0.7% below the AMD Ryzen 7 PRO 5755GE. That places the AI 7 345 in the performance envelope of a desktop Ryzen 7 from several generations prior.

The Verdict

The data supports a clear split. The AMD Ryzen 9 8945HX is the choice for workloads that scale with core count and thread count: multi-threaded rendering, video encoding, scientific computation, and any task with high parallel utilization. Its 16 cores and 32 threads, combined with a 5.40 GHz boost clock, deliver benchmark results that place it at the 95th percentile of all CPUs. The nearest rivals, including the Intel Core Ultra 9 285HX and the AMD Ryzen 9 9950X3D, are separated by less than 1%, which puts the 8945HX in a competitive high-end tier.

The AMD Ryzen AI 7 345, with 6 cores and 12 threads and a 4.60 GHz boost clock, is not competitive in multi-threaded benchmarks. Its Cinebench R23 multi-core score of 11,461 is roughly one quarter of the 8945HX's 42,713. In single-thread PassMark tests, however, the two are nearly even: 3,875 versus 3,907, a 0.8% gap. That result indicates the AI 7 345's Zen 5 architecture provides competitive per-core efficiency in lighter workloads, even though it loses decisively in Cinebench single-core tests where the 8945HX leads by 231.7%. The AI 7 345 also carries a 28 W TDP against the 8945HX's 55 W TDP, and its lower power envelope suggests a design oriented toward efficiency rather than peak throughput.

For a buyer prioritizing raw computational output, the 8945HX is the only defensible choice from this dataset. For a buyer prioritizing lower power draw and acceptable single-thread performance, the AI 7 345 has a place, but the benchmark record shows no scenario where it outperforms the 8945HX. The verdict is unambiguous: the 8945HX wins every measured comparison.

Architecture Differences

The two processors come from different architectural generations. The AMD Ryzen 9 8945HX uses Zen 4 architecture with the Dragon Range codename and belongs to the 8000 series. It is built on a 5 nm process at TSMC and contains 13,140 million transistors across a die size of 2x 71 mm². The AMD Ryzen AI 7 345 uses a hybrid Zen 5 / Zen 5c configuration with the Krackan Point codename and belongs to the Ryzen AI 300 generation. It is built on a 4 nm process at TSMC, with no transistor count or die size recorded in the database.

Cache layouts differ substantially. The 8945HX provides 64 KB of L1 cache per core, 1 MB of L2 cache per core, and 64 MB of L3 cache. The AI 7 345 provides 80 KB of L1 per core, 1 MB of L2 per core, and only 4 MB of L3 cache. The L3 difference is extreme: 64 MB versus 4 MB, a 16x gap. This contributes to the 8945HX's dominance in data-heavy workloads like compression and encryption, where large working sets benefit from ample cache.

The AI 7 345 uses a different core topology, as indicated by the Zen 5 / Zen 5c designation, which typically implies a mix of full-size and compact cores. The 8945HX uses a uniform Zen 4 layout across all 16 cores. The process node advantage goes to the AI 7 345 at 4 nm versus 5 nm, which helps explain its lower 28 W TDP despite the newer architecture. The 8945HX's 55 W TDP reflects its higher core count and sustained boost capability.

Memory architecture also differs. The 8945HX supports DDR5 only, with dual-channel memory and a recorded bandwidth of 83.2 GB/s. The AI 7 345 supports DDR5 and LPDDR5X, also dual-channel, with a slightly higher recorded bandwidth of 89.6 GB/s. The AI 7 345's higher memory bandwidth, despite its smaller core configuration, suggests a design optimized for integrated GPU performance and memory-intensive mobile workloads.

PCIe connectivity diverges as well. The 8945HX offers Gen 5 with 28 lanes (CPU only), while the AI 7 345 offers Gen 4 with 14 lanes (CPU only). The 8945HX provides double the lane count and a newer PCIe generation, which matters for discrete GPUs and fast NVMe storage. The integrated graphics differ: the 8945HX uses the Radeon 610M, while the AI 7 345 uses the Radeon 840M. The AI 7 345's newer Radeon 840M, combined with its higher memory bandwidth, likely serves lighter gaming and media tasks better, though no graphics benchmarks are present in the dataset.

The 8945HX has an unlocked multiplier, while the AI 7 345 does not. The 8945HX also has a newer release date of 2025-04-22, compared to the AI 7 345's 2025-01-14. Both use AMD sockets, but different ones: the 8945HX uses AMD Socket FL1, while the AI 7 345 uses AMD Socket FP8. Both are classified as mobile parts and both are currently active in production. Neither supports ECC memory.

Specification Differences

The core and thread counts are the primary specification gap: 16 cores and 32 threads for the 8945HX versus 6 cores and 12 threads for the AI 7 345. Base clock differs at 2.50 GHz versus 2.00 GHz, and boost clock differs at 5.40 GHz versus 4.60 GHz. TDP is 55 W versus 28 W. The 8945HX uses AMD Socket FL1; the AI 7 345 uses AMD Socket FP8. Process node is 5 nm versus 4 nm. L1 cache is 64 KB per core versus 80 KB per core, while L2 cache is identical at 1 MB per core. L3 cache is 64 MB versus 4 MB. Memory support is DDR5 only versus DDR5 and LPDDR5X. Memory bandwidth is 83.2 GB/s versus 89.6 GB/s. PCIe is Gen 5 with 28 lanes versus Gen 4 with 14 lanes. Integrated graphics are Radeon 610M versus Radeon 840M. The 8945HX has an unlocked multiplier; the AI 7 345 does not. Release dates are 2025-04-22 versus 2025-01-14. The 8945HX has a recorded transistor count of 13,140 million and a die size of 2x 71 mm², while no such figures exist for the AI 7 345. The 8945HX's part number is 100-000001848, and the AI 7 345's is 100-000002122.

FAQ

Q: Which CPU has more cores and threads?

A: The AMD Ryzen 9 8945HX has 16 cores and 32 threads. The AMD Ryzen AI 7 345 has 6 cores and 12 threads.

Q: What is the single-thread performance difference in PassMark?

A: The 8945HX scores 3,907 and the AI 7 345 scores 3,875 in PassMark single-thread, a 0.8% difference in favor of the 8945HX.

Q: Which CPU has more L3 cache?

A: The 8945HX has 64 MB of L3 cache. The AI 7 345 has 4 MB of L3 cache.

Q: What are the TDP values for each CPU?

A: The 8945HX has a TDP of 55 W. The AI 7 345 has a TDP of 28 W.

Q: Which CPU supports LPDDR5X memory?

A: Only the AI 7 345 supports LPDDR5X. The 8945HX supports DDR5 only.

Q: What PCIe generation and lane count does each CPU offer?

A: The 8945HX offers PCIe Gen 5 with 28 lanes. The AI 7 345 offers PCIe Gen 4 with 14 lanes.

Where Each One Wins

The AMD Ryzen 9 8945HX wins every benchmark in the dataset, so the use-case split depends on workload priorities and power constraints rather than any measured victory for the AI 7 345. The 8945HX dominates multi-threaded tasks: Cinebench R23 multi-core shows a 272.7% advantage, PassMark multithread shows a 158% lead, and integer math shows a 207.5% margin. Rendering, compiling, data processing, and heavy scientific workloads all fall into this category. The 8945HX also leads in every single-core Cinebench test, with a 231.7% edge in R23 single-core and a 124% edge in R15 single-core, indicating that its higher boost clock and larger cache help in lightly threaded legacy workloads as well.

The AI 7 345, despite losing all benchmarks, has a defined role. Its 28 W TDP is nearly half the 8945HX's 55 W TDP, which suits thin-and-light laptops where thermal and battery constraints dominate. Its 4 nm process node and support for LPDDR5X memory indicate a modern efficiency-focused design. The PassMark single-thread score of 3,875 versus 3,907 shows that its Zen 5 cores are competitive for everyday responsive tasks like web browsing and office applications, even though the Cinebench single-core results tell a different story. The Radeon 840M integrated graphics and higher memory bandwidth of 89.6 GB/s suggest better integrated GPU performance, though no graphics benchmarks exist in the database to confirm this.

The 8945HX's unlocked multiplier and PCIe Gen 5 with 28 lanes make it the better fit for gaming laptops with discrete GPUs, external GPU enclosures, or high-speed storage. The AI 7 345's PCIe Gen 4 with 14 lanes is sufficient for mainstream laptops but limits expansion. The 8945HX sits at the 95th percentile of all CPUs, while the AI 7 345 sits at the 81st percentile, which places them in different performance tiers entirely. For users who need maximum compute throughput, the 8945HX is the only option. For users who need a low-power mobile processor with reasonable single-thread responsiveness, the AI 7 345 is the viable alternative, but the recorded data shows no benchmark where it outperforms the 8945HX.