AMD Ryzen AI Max 390 vs Intel Xeon 6505P Comparison

The AMD Ryzen AI Max 390 and Intel Xeon 6505P are both 12-core, 24-thread processors, yet they occupy different corners of the hardware landscape. The data shows a clear split: the AMD part dominates general-purpose and single-threaded workloads, while the Intel Xeon secures two specific wins in floating-point math and physics simulations. Both processors sit at the 91st percentile against all CPUs, but their average benchmark scores diverge, with the Ryzen AI Max 390 posting an average of 56,273 versus the Xeon's 53,701. This page breaks down where each chip excels, the architectural reasoning behind those results, and the head-to-head numbers that define the matchup.

Where Each One Wins

The AMD Ryzen AI Max 390 is the clear victor in 15 of the 17 recorded head-to-head tests. Its most decisive margins come in single-threaded performance, where it leads by 26.4% in Passmark's single-thread test and by 10.6% in Cinebench R15 single-core. The pattern holds across every Cinebench version tested, with the AMD chip winning R15, R20, and R23 in both single-core and multi-core runs. For integer-heavy tasks, the Ryzen AI Max 390 is particularly strong, beating the Xeon by 21.6% in Passmark integer math and by a massive 45.6% in the find prime numbers test. Data compression and encryption also favor the AMD part, though by smaller margins of 1.4% and 2.6% respectively.

The Intel Xeon 6505P takes the remaining two tests. It wins Passmark floating-point math by 2.6% (92,992 versus 90,594) and Passmark physics by 7.7% (2,991 versus 2,761). These are the only benchmarks where the Xeon's architecture produces superior results. The floating-point win is notable because it runs counter to the AMD chip's otherwise dominant showing in math-related workloads, suggesting the Xeon's memory subsystem or execution resources are better tuned for certain vector operations.

In real-world terms, the Ryzen AI Max 390 is better suited for developers, content creators, and anyone running code that relies on integer arithmetic or quick single-thread responses. The Xeon 6505P, despite its server pedigree, only pulls ahead in niche scientific or physics-based workloads that stress floating-point throughput. For a mobile platform, the AMD chip's 55-watt TDP also makes it a far more practical choice, whereas the Xeon's 150-watt TDP places it firmly in server or workstation territory.

Architecture Differences

The architectural gap between these two parts is substantial. The AMD Ryzen AI Max 390 uses the Zen 5 architecture on TSMC's 4nm process node, with a die size reported as 2x 70.6 mm². It is built for the mobile segment, fitting into AMD Socket FP11. The Intel Xeon 6505P, by contrast, uses the Granite Rapids architecture on Intel's 5nm node, targets the server and workstation market, and fits into Intel Socket 4710. The process node difference gives AMD a manufacturing advantage, though the Xeon compensates with a larger memory interface.

Cache layouts diverge significantly. The AMD part allocates 80 KB of L1 per core, 1 MB of L2 per core, and a 64 MB shared L3 cache. The Xeon provides 112 KB of L1 per core, 2 MB of L2 per core, but only 48 MB of shared L3. This means the Intel chip has more per-core cache for L1 and L2, while the AMD chip has a larger shared pool for the entire processor. The Ryzen AI Max 390's bigger L3 likely contributes to its wins in integer math and prime number calculations, which benefit from larger working sets residing close to the cores.

Memory support is another major divider. The AMD chip uses LPDDR5X with a quad-channel bus and a maximum bandwidth of 256.0 GB/s. The Xeon 6505P uses DDR5 with an eight-channel bus and a higher bandwidth of 409.6 GB/s. Both support ECC memory, but the Xeon's 60% greater memory bandwidth (409.6 versus 256.0 GB/s) is a direct factor in its floating-point win. The AMD part also includes integrated graphics (Radeon 8050S), whereas the Xeon has no integrated GPU, reflecting their different intended use cases.

PCIe connectivity is lopsided. The Xeon 6505P provides Gen 5 with 88 lanes (CPU only), while the Ryzen AI Max 390 offers Gen 4 with just 16 lanes. This makes the Xeon far more capable for multi-GPU or high-throughput I/O scenarios in servers. Clock speeds also differ, with the AMD part boosting to 5.00 GHz versus the Xeon's 4.10 GHz, and the AMD base clock sits at 3.20 GHz versus 2.20 GHz for the Xeon. Both processors have locked multipliers.

Head-to-Head Benchmarks

The Cinebench suite shows consistent AMD dominance. In R15 multi-core, the Ryzen AI Max 390 scores 3,635 against the Xeon's 3,294, a 10.4% advantage. R15 single-core sees 513 versus 464, a 10.6% edge. R20 multi-core results are 15,146 versus 13,728 (10.3% ahead), and R20 single-core is 2,138 versus 1,937 (10.4% ahead). R23 multi-core shows 36,064 versus 32,687 (10.3% ahead), and R23 single-core is 5,091 versus 4,614 (10.3% ahead). These numbers are remarkably consistent, indicating the AMD chip maintains a stable performance lead regardless of the workload generation.

Passmark results add more texture. The biggest single delta is in find prime numbers, where the AMD chip scores 316 against the Xeon's 217, a 45.6% advantage. This test is highly sensitive to integer arithmetic and memory latency, both of which favor the AMD architecture. Integer math also shows a large gap: 146,519 versus 120,456, a 21.6% lead. Single-thread performance in Passmark is similarly lopsided at 4,028 versus 3,187, a 26.4% difference. Multithread scores favor AMD by 8.5% (41,737 versus 38,456).

The Xeon's wins are narrower. Floating-point math sees the Xeon score 92,992 versus 90,594, a 2.6% advantage. Physics is the Xeon's other bright spot, with 2,991 versus 2,761, a 7.7% margin. Both wins are modest compared to the AMD chip's larger victories. In data compression, encryption, extended instructions, and random string sorting, the AMD part wins by margins between 1.4% and 3.2%, suggesting a slight but consistent advantage in memory-bound and instruction-heavy tasks as well.

Specification Differences

| Specification | AMD Ryzen AI Max 390 | Intel Xeon 6505P |

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

| Base Clock | 3.20 GHz | 2.20 GHz |

| Boost Clock | 5.00 GHz | 4.10 GHz |

| TDP | 55 W | 150 W |

| Socket | AMD Socket FP11 | Intel Socket 4710 |

| Architecture | Zen 5 | Granite Rapids |

| Process Node | 4 nm (TSMC) | 5 nm (Intel) |

| L1 Cache (per core) | 80 KB | 112 KB |

| L2 Cache (per core) | 1 MB | 2 MB |

| L3 Cache (shared) | 64 MB | 48 MB |

| Memory Type | LPDDR5X | DDR5 |

| Memory Bus | Quad-channel | Eight-channel |

| Memory Bandwidth | 256.0 GB/s | 409.6 GB/s |

| PCIe Version | Gen 4 | Gen 5 |

| PCIe Lanes (CPU only) | 16 | 88 |

| Integrated Graphics | Radeon 8050S | N/A |

| Market Segment | Mobile | Server/Workstation |

| Launch MSRP | None listed | $563 |

The table highlights the core trade-offs. The AMD part offers higher clocks, a smaller process node, and a larger L3 cache, but the Xeon counters with more per-core cache, higher memory bandwidth, and vastly more PCIe lanes. The TDP difference is stark: 55 watts versus 150 watts, which directly impacts cooling requirements and deployment scenarios. The Xeon's launch MSRP is listed as $563.

FAQ

Q: Which processor has the higher boost clock?

A: The AMD Ryzen AI Max 390 boosts to 5.00 GHz, while the Intel Xeon 6505P boosts to 4.10 GHz.

Q: Does the Intel Xeon 6505P support ECC memory?

A: Yes, both the Intel Xeon 6505P and the AMD Ryzen AI Max 390 support ECC memory.

Q: How much memory bandwidth does each processor provide?

A: The Intel Xeon 6505P offers 409.6 GB/s over an eight-channel DDR5 bus, while the AMD Ryzen AI Max 390 provides 256.0 GB/s over a quad-channel LPDDR5X bus.

Q: Which processor has integrated graphics?

A: The AMD Ryzen AI Max 390 includes Radeon 8050S integrated graphics. The Intel Xeon 6505P has no integrated graphics.

Q: What are the average benchmark scores for each processor?

A: The AMD Ryzen AI Max 390 posts an average benchmark score of 56,273, while the Intel Xeon 6505P records 53,701.

Q: In which benchmarks does the Intel Xeon 6505P outperform the AMD Ryzen AI Max 390?

A: The Xeon wins Passmark floating-point math (92,992 versus 90,594) and Passmark physics (2,991 versus 2,761).