AMD Ryzen 9 7945HX3D vs AMD Ryzen AI Max 390 Comparison

AMD Ryzen AI Max 390 and AMD Ryzen 9 7945HX3D are both high-end mobile processors, yet the benchmark data reveals they serve distinctly different performance profiles. The Ryzen 9 7945HX3D wins every single head-to-head comparison, but the margin of victory varies dramatically from a near-tie in single-threaded tests to a crushing 39.4% lead in encryption workloads. The Ryzen AI Max 390 counters with a newer architecture, a more advanced process node, and a vastly superior integrated graphics solution, though raw compute throughput clearly belongs to the 7945HX3D.

Head-to-Head Benchmarks

The most striking pattern across all 17 shared benchmarks is uniformity: the Ryzen 9 7945HX3D claims victory in every instance. The closest contest occurs in PassMark single-thread testing, where the 7945HX3D scores 4050 against the AI Max 390's 4025, a razor-thin 0.6% advantage. That margin essentially represents a statistical tie, suggesting both processors deliver comparable per-core performance in lightly threaded workloads.

The gap widens substantially in multi-threaded Cinebench tests. In Cinebench R23 multi-core, the 7945HX3D posts 48834 versus 36064 for the AI Max 390, a 26.1% deficit for the latter. The same pattern repeats in Cinebench R20 multi-core (20510 vs 15146, 26.2% gap) and R15 multi-core (4922 vs 3635, 26.1% gap). These consistent deltas across Cinebench versions indicate the 7945HX3D's 16 cores and 32 threads provide a structural advantage over the AI Max 390's 12 cores and 24 threads in heavily parallel rendering workloads.

Single-core Cinebench results show an identical 26.1-26.2% gap, which is surprising given the PassMark single-thread near-tie. In Cinebench R23 single-core, the 7945HX3D scores 6894 against 5091 for the AI Max 390. This discrepancy between benchmark suites suggests the 7945HX3D's higher boost clock of 5.40 GHz versus 5.00 GHz plays a larger role in Cinebench's specific workload than in PassMark's.

PassMark's specialized tests reveal where the 7945HX3D truly dominates. Data encryption shows the largest margin: 42367 for the 7945HX3D versus 25692 for the AI Max 390, a massive 39.4% advantage. Physics simulation follows at 36.3% (4321 vs 2754), and random string sorting trails at 35.8% (83919 vs 53851). These workloads likely benefit from the 7945HX3D's 128 MB of shared L3 cache, which includes a 1x 64MB 3D V-Cache slice, enabling larger working sets to remain on-die.

The remaining PassMark tests show consistent 23-29.5% leads for the 7945HX3D: floating point math (121619 vs 93598, 23% gap), extended instructions (52310 vs 39250, 25%), integer math (201217 vs 148707, 26.1%), multi-threaded (57476 vs 42429, 26.2%), data compression (699988 vs 493517, 29.5%), and prime number finding (446 vs 322, 27.8%). The average benchmark score reflects this overall picture: the AI Max 390 averages 57103 across all tests, while the 7945HX3D averages 56635 — a 0.8% difference in the AI Max's favor when considering benchmarks exclusive to each processor, though the 7945HX3D has additional 3DMark results not shared.

FAQ

Q: Which processor wins in multi-core performance?

A: The Ryzen 9 7945HX3D wins all multi-core benchmarks, with Cinebench R23 multi-core showing 48834 versus 36064 for the AI Max 390, a 26.1% advantage. PassMark multi-thread similarly favors the 7945HX3D at 57476 versus 42429, a 26.2% gap.

Q: Is the Ryzen AI Max 390 competitive in single-threaded workloads?

A: It depends on the benchmark. In PassMark single-thread, the AI Max 390 scores 4025 against 4050 for the 7945HX3D, a negligible 0.6% difference. However, in Cinebench R23 single-core, the 7945HX3D leads by 26.2% (6894 vs 5091), indicating the AI Max 390's Zen 5 architecture does not translate to single-core wins in all suites.

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

A: The biggest margin is in PassMark data encryption, where the 7945HX3D scores 42367 versus 25692 for the AI Max 390, a 39.4% advantage. Physics simulation and random string sorting also show large gaps of 36.3% and 35.8%, respectively.

Q: How do their integrated graphics compare?

A: The AI Max 390 features a Radeon 8050S, while the 7945HX3D has a Radeon 610M. The AI Max 390's memory bandwidth of 256.0 GB/s via quad-channel LPDDR5X far exceeds the 7945HX3D's 83.2 GB/s dual-channel DDR5, which directly impacts integrated graphics performance.

Q: Do both processors support ECC memory?

A: Yes, both the Ryzen AI Max 390 and the Ryzen 9 7945HX3D list ECC memory support as true, though they use different memory types — LPDDR5X for the AI Max and DDR5 for the 7945HX3D.

Q: What is the performance percentile ranking for each?

A: Both processors rank in the 94th percentile against all CPUs, placing them in the same overall tier despite the 7945HX3D's consistent head-to-head wins.

Where Each One Wins

The Ryzen 9 7945HX3D wins every shared benchmark, so the use-case split depends on the magnitude of its advantage and the AI Max 390's exclusive features. For compute-heavy workloads — rendering, video encoding, scientific simulation, data compression, and encryption — the 7945HX3D is the clear choice. Its 26-39% leads in Cinebench multi-core and PassMark specialized tests mean tasks that scale across 16 cores and 32 threads will finish substantially faster. The 128 MB L3 cache with 3D V-Cache provides particular benefit for data-dense operations like encryption (39.4% lead) and random string sorting (35.8% lead), where larger cache residency reduces memory traffic.

The Ryzen AI Max 390 wins in scenarios where the CPU's raw compute is less important than the surrounding platform. Its Radeon 8050S integrated graphics vastly outclasses the 7945HX3D's Radeon 610M, making it the better option for gaming or GPU-accelerated workloads without a discrete graphics card. The 256.0 GB/s memory bandwidth from quad-channel LPDDR5X — over three times the 7945HX3D's 83.2 GB/s — feeds both the CPU and GPU effectively. The AI Max 390 also uses a 4 nm process versus 5 nm, offers Zen 5 architecture versus Zen 4, and has a smaller die size of 2x 70.6 mm² versus 2x 71 mm², though these architectural advantages do not translate into compute wins in the shared benchmarks.

Specification Differences

The core counts differ significantly: the Ryzen 9 7945HX3D has 16 cores and 32 threads, while the Ryzen AI Max 390 has 12 cores and 24 threads. Clock speeds favor the 7945HX3D with a 2.30 GHz base and 5.40 GHz boost, versus 3.20 GHz base and 5.00 GHz boost for the AI Max 390. Cache configuration diverges sharply: the 7945HX3D has 64 KB L1 per core, 1 MB L2 per core, and 128 MB shared L3 with a 1x 64MB 3D V-Cache slice, while the AI Max 390 has 80 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3 with no 3D V-Cache.

Memory support differs fundamentally: the AI Max 390 uses LPDDR5X with a quad-channel bus and 256.0 GB/s bandwidth, while the 7945HX3D uses DDR5 with a dual-channel bus and 83.2 GB/s bandwidth. PCIe connectivity favors the 7945HX3D with Gen 5 and 28 lanes, versus Gen 4 and 16 lanes for the AI Max 390. The socket differs (FP11 for AI Max, FL1 for 7945HX3D), as does the integrated graphics (Radeon 8050S versus Radeon 610M). The 7945HX3D has an unlocked multiplier, while the AI Max 390 does not. Release dates differ by roughly 18 months, with the 7945HX3D launching in 2023 and the AI Max 390 in 2025.

Architecture Differences

The Ryzen AI Max 390 uses Zen 5 architecture on a 4 nm TSMC process, with a codename of Strix Halo and generation "Ryzen AI Max (Zen 5 (Strix Halo))". It has a die size of 2x 70.6 mm². The Ryzen 9 7945HX3D uses Zen 4 architecture on a 5 nm TSMC process, with a codename of Dragon Range and generation "Ryzen 9 (Zen 4 (Dragon Range))". It has a die size of 2x 71 mm² and contains 17,840 million transistors, a figure not listed for the AI Max 390.

Cache architecture differs notably: the AI Max 390 has larger L1 at 80 KB per core versus 64 KB, but the 7945HX3D doubles the shared L3 to 128 MB from 64 MB and adds a dedicated 1x 64MB 3D V-Cache slice. The 7945HX3D also supports PCIe Gen 5 with 28 lanes versus Gen 4 with 16 lanes, and its dual-channel memory configuration contrasts with the AI Max's quad-channel design.

The Verdict

The benchmark data presents a one-sided picture for raw CPU performance: the Ryzen 9 7945HX3D wins all 17 shared benchmarks, with margins ranging from 0.6% to 39.4%. Users who prioritize multi-threaded compute — rendering, data processing, encryption, physics simulation — should choose the 7945HX3D. Its 16 cores, 32 threads, 128 MB L3 cache, and higher boost clock deliver 26% or better results across Cinebench and most PassMark tests, with encryption and physics workloads showing even larger gains. The unlocked multiplier adds overclocking flexibility absent from the AI Max 390.

The Ryzen AI Max 390 is the better choice for users who need integrated graphics capability or memory bandwidth as part of the CPU package. Its Radeon 8050S and 256.0 GB/s quad-channel LPDDR5X bandwidth provide a platform advantage that the 7945HX3D cannot match with its Radeon 610M and 83.2 GB/s dual-channel DDR5. It also uses a newer 4 nm process and Zen 5 architecture, though these do not translate into compute wins. For workloads that leverage the GPU or require high memory throughput, the AI Max 390's platform strengths outweigh its 26-39% CPU deficits. For pure CPU throughput, the 7945HX3D is the definitive winner.