AMD Ryzen 9 9955HX3D vs Intel Xeon 6520P Comparison

The AMD Ryzen 9 9955HX3D and Intel Xeon 6520P present a fascinating study in contrasting design philosophies. The AMD part is a mobile flagship built on a 4nm TSMC process, while the Intel Xeon is a server/workstation powerhouse on Intel’s 5nm node. Their benchmark results reveal a clear split: the Xeon dominates in raw multi-threaded throughput and physics, while the Ryzen counters with commanding single-thread scores and integer math. This page dissects where each processor wins, what the architecture differences mean, and which user should prioritize which chip.

Where Each One Wins

The Intel Xeon 6520P is the clear victor in heavy, parallel workloads. It wins 11 of the 15 head-to-head benchmarks, including all Cinebench multi-core tests and every PassMark test except integer math and single-thread. Its largest wins come in Cinebench R23 multi-core, where it leads by 28.7%, and Cinebench R15 single-core, where it is 56.4% ahead. The Xeon also dominates in physics (35% ahead), random string sorting (12.8%), and data encryption (12.7%). This pattern indicates a processor optimized for sustained, multi-threaded server tasks—compression, encryption, physics simulation—where its 24 cores and 48 threads provide a substantial advantage.

The AMD Ryzen 9 9955HX3D wins only 4 benchmarks, but they are strategically significant. It takes PassMark single-thread by 34.4% and integer math by 3.8%, plus Cinebench R15 multi-core by 12.1%. The single-thread win is enormous, suggesting the Ryzen’s higher boost clock (5.40 GHz vs 4.00 GHz) and Zen 5 architecture deliver superior per-core performance. The R15 multi-core victory is curious, given the Xeon wins R23 multi-core; this may reflect different workload scaling or thermal behavior under shorter tests. For users prioritizing responsiveness in lightly-threaded applications, the Ryzen is the obvious choice.

Architecture Differences

The two chips could not be more different internally. The AMD Ryzen 9 9955HX3D uses 16 cores and 32 threads based on Zen 5 architecture, fabricated on a 4nm TSMC process. The Intel Xeon 6520P uses 24 cores and 48 threads on Granite Rapids architecture, built on Intel’s 5nm process. The core count difference (16 vs 24) directly explains the Xeon’s multi-threaded edge. The Ryzen compensates with a higher boost clock (5.40 vs 4.00 GHz) and a much lower TDP (55W vs 210W), though the Xeon’s 210W TDP reflects its server-class power envelope.

Cache configurations also diverge sharply. The Ryzen has 80 KB L1 and 1 MB L2 per core, with 128 MB of L3 cache—a massive pool likely aided by 3D V-Cache technology, though the pack does not explicitly label it as such. The Xeon has larger per-core caches (112 KB L1, 2 MB L2) and a shared 144 MB L3, totaling more cache overall. Memory bandwidth is another major split: the Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, versus the Ryzen’s dual-channel 89.6 GB/s. This 4.6x bandwidth advantage makes the Xeon far more suitable for memory-intensive server workloads. PCIe lane counts differ as well (28 vs 88 Gen 5 lanes), reinforcing the Xeon’s workstation role. The Ryzen integrates a Radeon 610M GPU; the Xeon has none. Manufacturing scale also differs: the Ryzen uses two 70.6 mm² dies with 16,630 million transistors, while the Xeon is a single 598 mm² die.

Head-to-Head Benchmarks

The most striking result is Cinebench R23 multi-core, where the Xeon scores 53,495 against the Ryzen’s 38,161.5—a 28.7% margin. This is the Xeon’s definitive statement for rendering and compilation tasks. Yet in Cinebench R15 multi-core, the Ryzen wins 6042.5 to 5392 (12.1% ahead). This reversal suggests the R15 test may be less memory-bandwidth-sensitive, allowing the Ryzen’s higher clock speed to shine. The single-core Cinebench results are even more lopsided: the Xeon leads R15 single-core by 56.4% (761 vs 332) and R23 single-core by 71.4% (7552 vs 2159.5). These deltas are puzzling, given the Ryzen’s PassMark single-thread win, but they highlight how different benchmark suites stress the chips differently—possibly due to AVX-512 or other instruction-set advantages in the Xeon.

In PassMark tests, the Xeon edges out the Ryzen in most categories. Data compression: 841,518 vs 785,811 (6.6% ahead). Data encryption: 45,188 vs 39,446 (12.7% ahead). Extended instructions: 64,557 vs 62,813 (2.7% ahead). Floating-point math: 162,862 vs 144,122 (11.5% ahead). Physics: 7209 vs 4687 (a massive 35% lead). Random string sorting: 95,736 vs 83,497 (12.8% ahead). Multi-thread score: 62,936 vs 62,674 (a razor-thin 0.4% margin). Find prime numbers is essentially tied (526 vs 525, only 0.2% apart). The Ryzen’s only PassMark wins are integer math (222,503 vs 214,288, 3.8% ahead) and single-thread (4511 vs 3356, 34.4% ahead). The single-thread win is the Ryzen’s most impressive, nearly 1.35x the Xeon’s score, indicating superior per-core execution.

FAQ

Q: Which processor is faster in single-threaded tasks?

A: The AMD Ryzen 9 9955HX3D wins PassMark single-thread by 34.4% (4511 vs 3356). However, the Intel Xeon 6520P wins both Cinebench single-core tests, leading by 56.4% in R15 and 71.4% in R23, indicating benchmark-specific differences.

Q: What is the core and thread count difference?

A: The AMD has 16 cores and 32 threads, while the Intel Xeon has 24 cores and 48 threads. The Xeon’s 50% more cores and 50% more threads contribute to its multi-threaded benchmark dominance.

Q: How do the memory systems compare?

A: The Intel Xeon supports eight-channel DDR5 with 409.6 GB/s bandwidth, while the AMD Ryzen uses dual-channel DDR5 with 89.6 GB/s. This 4.6x bandwidth advantage favors the Xeon in memory-intensive workloads.

Q: Which chip has better energy efficiency?

A: The AMD Ryzen has a TDP of 55W, compared to the Intel Xeon’s 210W. The Ryzen’s lower TDP suggests far better energy efficiency, though the Xeon’s higher power budget enables sustained multi-threaded performance.

Q: What is the L3 cache size on each?

A: The AMD Ryzen has 128 MB of L3 cache, while the Intel Xeon has 144 MB of shared L3 cache. The Xeon also has larger per-core L1 and L2 caches (112 KB and 2 MB vs 80 KB and 1 MB).

Q: Which processor has a higher boost clock?

A: The AMD Ryzen boosts to 5.40 GHz, while the Intel Xeon boosts to 4.00 GHz. This 1.4 GHz difference likely explains the Ryzen’s PassMark single-thread advantage.

The Verdict

The data points to two distinct buyer profiles. If your workload is heavily multi-threaded—rendering, physics simulation, data compression, or server-side encryption—the Intel Xeon 6520P is the superior choice. It wins 11 of 15 head-to-head tests, with decisive margins in Cinebench R23 multi-core (28.7%), physics (35%), and data encryption (12.7%). Its 24 cores, 48 threads, and eight-channel memory bandwidth (409.6 GB/s) make it a purpose-built server/workstation part. The launch MSRP is $1295.

Conversely, if you prioritize single-thread responsiveness, integer math, or power efficiency, the AMD Ryzen 9 9955HX3D is compelling. It wins PassMark single-thread by 34.4% and integer math by 3.8%, while drawing only 55W TDP versus the Xeon’s 210W. Its 5.40 GHz boost clock and 128 MB L3 cache deliver exceptional per-core performance. The Ryzen also wins Cinebench R15 multi-core by 12.1%, suggesting it handles shorter, bursty loads well. However, its dual-channel memory (89.6 GB/s) and 16 cores limit its multi-threaded ceiling. The verdict: choose the Xeon for raw throughput and memory bandwidth; choose the Ryzen for single-thread speed, efficiency, and mobile compatibility.

Specification Differences

| Specification | AMD Ryzen 9 9955HX3D | Intel Xeon 6520P |

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

| Cores | 16 | 24 |

| Threads | 32 | 48 |

| Base Clock | 2.50 GHz | 2.40 GHz |

| Boost Clock | 5.40 GHz | 4.00 GHz |

| TDP | 55W | 210W |

| Socket | AMD Socket FL1 | Intel Socket 4710 |

| Architecture | Zen 5 | Granite Rapids |

| Process Node | 4 nm | 5 nm |

| Foundry | TSMC | Intel |

| Die Size | 2x 70.6 mm² | 598 mm² |

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

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

| L3 Cache | 128 MB | 144 MB (shared) |

| Memory Bus | Dual-channel | Eight-channel |

| Memory Bandwidth | 89.6 GB/s | 409.6 GB/s |

| PCIe | Gen 5, 28 Lanes | Gen 5, 88 Lanes |

| Integrated Graphics | Radeon 610M | N/A |

| Market Segment | Mobile | Server/Workstation |

| Multiplier Unlocked | Yes | No |

| Transistors | 16,630 million | Not specified |