AMD Ryzen AI Max 385 vs Intel Core i9-12900KS Comparison

The Intel Core i9-12900KS and AMD Ryzen AI Max 385 represent two fundamentally different design philosophies: a high-power desktop flagship versus a mobile-first APU. Benchmark results show a decisive overall victory for the Intel part, which wins 16 of 17 head-to-head comparisons, but the single AMD win and several narrow margins reveal where the Zen 5 architecture holds its ground.

Head-to-Head Benchmarks

The most striking pattern in the data is the sheer scale of Intel’s victory in Cinebench workloads. In Cinebench R23 multi-core, the i9-12900KS scores 36,859 against the Ryzen AI Max 385’s 15,674, a delta of 135.2%. The single-core R23 result is equally lopsided: 5,203 versus 2,212, also a 135.2% advantage. This consistency extends across the entire Cinebench suite — R15 multi-core (3,715 vs 1,579, +135.3%), R15 single-core (524 vs 222, +136%), R20 multi-core (15,480 vs 6,583, +135.2%), and R20 single-core (2,185 vs 929, +135.2%). The near-identical deltas across all six Cinebench tests suggest a fundamental throughput advantage rather than a workload-specific quirk.

Outside Cinebench, Intel’s wins are smaller but still substantial. PassMark integer math shows 147,575 versus 107,046, a 37.9% lead, while floating-point math is even more one-sided at 111,429 versus 71,105, a 56.7% margin. Data compression (563,709 vs 406,505, +38.7%) and random string sorting (60,539 vs 43,725, +38.5%) follow similar patterns. Encryption performance favors Intel heavily: 31,403 versus 19,926, a 57.6% gap.

The most competitive areas are single-threaded and lightly threaded workloads. PassMark single-thread shows 4,330 versus 4,060, a modest 6.7% Intel lead. Extended instructions are closer still: 35,089 versus 33,873, just 3.6% apart. The only AMD victory comes in PassMark find prime numbers, where the Ryzen AI Max 385 scores 165 against Intel’s 158, a 4.2% edge. This is a narrow but genuine win for the Zen 5 core in a specific integer-heavy algorithm.

Overall workload scores reinforce the picture. The i9-12900KS averages 45,094 across benchmarks, ranking at the 89th percentile of all CPUs, while the Ryzen AI Max 385 averages 44,309, placing it at the 88th percentile. The 1.8% average score difference is far smaller than individual benchmark deltas suggest, because the AMD part is competitive in several PassMark tests and the Intel wins are concentrated in specific suites.

FAQ

Q: Which processor wins more head-to-head benchmarks?

A: The Intel Core i9-12900KS wins 16 of 17 comparisons. The AMD Ryzen AI Max 385 wins only one: PassMark find prime numbers.

Q: How large is Intel’s lead in multi-core rendering?

A: In Cinebench R23 multi-core, the i9-12900KS scores 36,859 versus 15,674 for the Ryzen AI Max 385, a 135.2% advantage. Similar margins appear in R15 and R20 multi-core tests.

Q: Is the Ryzen AI Max 385 competitive in single-threaded tests?

A: It is closer but still loses. PassMark single-thread shows 4,330 for Intel versus 4,060 for AMD, a 6.7% gap. In Cinebench R23 single-core, Intel leads 5,203 to 2,212.

Q: What is the closest benchmark result between the two?

A: PassMark extended instructions is the tightest margin, with Intel at 35,089 and AMD at 33,873, a 3.6% difference. The AMD win in find prime numbers is a 4.2% margin (165 vs 158).

Q: How do their overall average scores compare?

A: The i9-12900KS has an average benchmark score of 45,094, while the Ryzen AI Max 385 averages 44,309. Intel ranks at the 89th percentile of all CPUs versus AMD’s 88th.

Q: Does the AMD processor win any memory-related benchmarks?

A: No memory-specific benchmarks are included in the head-to-head data. The AMD part does support quad-channel LPDDR5X with 256.0 GB/s bandwidth versus Intel’s dual-channel 76.8 GB/s, but no benchmark score reflects this advantage.

Architecture Differences

The two processors come from different foundries and nodes. Intel’s Alder Lake-S uses a 10 nm process from Intel, while AMD’s Strix Halo uses TSMC’s 4 nm node. Die size contrasts sharply: Intel’s monolithic die measures 215 mm², whereas AMD uses a dual-die design with two 70.6 mm² chiplets.

Core configurations diverge significantly. The i9-12900KS packs 16 cores and 24 threads, while the Ryzen AI Max 385 has 8 cores and 16 threads. Both use an 80 KB L1 cache per core, but L2 differs: Intel has 1.25 MB per core versus AMD’s 1 MB per core. L3 cache favors AMD slightly at 32 MB shared versus Intel’s 30 MB shared.

Memory architecture is a major differentiator. Intel supports DDR4 and DDR5 in dual-channel mode with 76.8 GB/s bandwidth. AMD uses LPDDR5X in quad-channel mode, delivering 256.0 GB/s — more than three times the bandwidth. Both support ECC memory. PCIe generations differ: Intel offers Gen 5 with 16 CPU lanes, while AMD provides Gen 4 with 16 CPU lanes.

The i9-12900KS is built for the desktop Socket 1700 with a 150 W TDP and an unlocked multiplier. The Ryzen AI Max 385 targets mobile with Socket FP11, a 55 W TDP, and a locked multiplier. Intel’s integrated graphics is UHD Graphics 770; AMD uses Radeon 8050S. Intel launched on 2022-04-04 with a launch MSRP of $739; AMD released on 2025-01-05 with no listed MSRP.

Specification Differences

| Specification | Intel Core i9-12900KS | AMD Ryzen AI Max 385 |

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

| Cores | 16 | 8 |

| Threads | 24 | 16 |

| Base Clock | 3.40 GHz | 3.60 GHz |

| Boost Clock | 5.50 GHz | 5.00 GHz |

| TDP | 150 W | 55 W |

| Socket | Intel Socket 1700 | AMD Socket FP11 |

| Process Node | 10 nm | 4 nm |

| Foundry | Intel | TSMC |

| Die Size | 215 mm² | 2x 70.6 mm² |

| L2 Cache | 1.25 MB (per core) | 1 MB (per core) |

| L3 Cache | 30 MB (shared) | 32 MB (shared) |

| Memory Support | DDR4, DDR5 | LPDDR5X |

| Memory Bus | Dual-channel | Quad-channel |

| Memory Bandwidth | 76.8 GB/s | 256.0 GB/s |

| PCIe | Gen 5, 16 Lanes | Gen 4, 16 Lanes |

| Integrated Graphics | UHD Graphics 770 | Radeon 8050S |

| Market Segment | Desktop | Mobile |

| Release Date | 2022-04-04 | 2025-01-05 |

| Multiplier Unlocked | Yes | No |

Where Each One Wins

The Intel Core i9-12900KS is the clear choice for compute-heavy desktop workloads. Its Cinebench results are exceptional — 135% or better across all six rendering tests — making it the superior option for multi-threaded content creation, 3D rendering, and video encoding. The PassMark multithread score of 43,698 versus 33,705 (29.6% lead) and integer math advantage of 37.9% further cement its position for scientific computing and compilation tasks. Data compression and encryption workloads also favor Intel with margins of 38.7% and 57.6% respectively, making it the stronger pick for database work and secure data handling. With 16 cores, 24 threads, and a 5.50 GHz boost clock, this processor excels in any scenario where raw throughput and high clock speeds are paramount.

The AMD Ryzen AI Max 385 wins in one narrow but interesting niche: PassMark find prime numbers, where its 165 score beats Intel’s 158 by 4.2%. This suggests a specific algorithm-level advantage for Zen 5 in certain integer operations. More broadly, the AMD part’s strengths lie outside the included benchmarks. Its quad-channel LPDDR5X memory with 256.0 GB/s bandwidth is a massive architectural advantage for memory-bound workloads, even though no benchmark in this dataset captures that benefit. The 55 W TDP, versus Intel’s 150 W, makes it the more power-efficient option for mobile platforms. The Radeon 8050S integrated graphics also likely outperforms UHD Graphics 770, though no graphics benchmark data is available here.

For single-threaded responsiveness, the two are much closer than the overall scores suggest. The 6.7% PassMark single-thread gap and 3.6% extended-instructions gap indicate that in everyday lightly threaded tasks, the Ryzen AI Max 385 is nearly on par with the i9-12900KS. The AMD part’s higher base clock (3.60 GHz vs 3.40 GHz) helps it stay competitive despite the lower boost clock (5.00 GHz vs 5.50 GHz).

Ultimately, the i9-12900KS dominates in almost every measured metric, but the Ryzen AI Max 385 offers a compelling counter-narrative: near-parity in select single-threaded workloads, a memory bandwidth advantage, lower power consumption, and a more modern 4 nm process. The choice depends entirely on whether the workload prioritizes the Intel part’s massive multi-core lead or the AMD part’s efficiency and memory architecture.