AMD Ryzen 9 9955HX vs Intel Xeon 6736P Comparison

The AMD Ryzen 9 9955HX and Intel Xeon 6736P represent two fundamentally different approaches to high-core-count computing, with the former built for mobile efficiency and the latter for server density. The data shows a clear split: the AMD part wins 6 of 15 head-to-head benchmarks, while the Intel Xeon claims 9, but the distribution of those wins reveals distinct use-case strengths rather than a single overall champion.

Where Each One Wins

The AMD Ryzen 9 9955HX dominates in single-threaded workloads. Its PassMark single-thread score of 4393 is 117% higher than the Xeon’s 2024, a massive margin that makes it the clear choice for latency-sensitive tasks. It also leads in PassMark multithread (56171 vs 50072, +12.2%), integer math (212598 vs 206833, +2.8%), and extended instructions (57946 vs 55563, +4.3%). These wins point toward interactive workloads, general-purpose computing, and applications that rely on fast per-core response.

The Intel Xeon 6736P counters with decisive victories in Cinebench R23 multi-core (42561 vs 37159, +12.7% for Intel) and Cinebench R15 multi-core (4290 vs 5905, with AMD actually winning that one by 37.6%). Wait—the R15 multi-core goes to AMD, while R23 multi-core goes to Intel. That discrepancy suggests the Xeon scales better with longer, more demanding render workloads, while the AMD part excels in shorter bursts. The Xeon also wins physics (6531 vs 2720, +58.4%), random string sorting (103723 vs 77890, +24.9%), data encryption (46236 vs 37330, +19.3%), and data compression (796658 vs 731998, +8.1%). These are classic server-side tasks: cryptography, data processing, and parallel compute.

The split is clean: AMD for single-thread and interactive response, Intel for sustained multi-thread and data-heavy server operations.

Architecture Differences

The two chips could hardly be more different in construction. The Ryzen 9 9955HX uses AMD’s Zen 5 architecture on a 4 nm TSMC process, packing 16 cores and 32 threads into a Fire Range mobile design. Its die size is listed as 2x 70.6 mm² with 16,630 million transistors. The Xeon 6736P uses Intel’s Granite Rapids architecture on a 5 nm Intel process, with 36 cores and 72 threads on a single 598 mm² die. That transistor count is not listed for Intel, but the physical scale difference is stark.

Cache hierarchies diverge significantly. The AMD part offers 80 KB L1 per core, 1 MB L2 per core, and 64 MB shared L3. The Xeon provides 112 KB L1 per core, 2 MB L2 per core, and 144 MB shared L3. The Xeon’s larger per-core L2 and more than double the L3 cache (144 MB vs 64 MB) helps explain its strength in data-heavy workloads like compression and encryption. The AMD part’s smaller cache is offset by higher boost clocks: 5.40 GHz vs 4.10 GHz for the Xeon.

Memory subsystems also differ fundamentally. The Ryzen 9 9955HX supports dual-channel DDR5 with 89.6 GB/s bandwidth, while the Xeon 6736P uses eight-channel DDR5 with 409.6 GB/s—more than 4.5 times the bandwidth. Both support ECC memory. PCIe lanes show a similar gap: 28 Gen 5 lanes for AMD vs 88 Gen 5 lanes for Intel. The Xeon also lacks integrated graphics, while the AMD part includes a Radeon 610M iGPU.

FAQ

Q: Which CPU is faster in single-threaded benchmarks?

A: The AMD Ryzen 9 9955HX. It scores 4393 in PassMark single-thread, which is 117% higher than the Intel Xeon 6736P’s 2024. In Cinebench R23 single-core, the Xeon actually wins with 6008 vs 2174, but the PassMark result shows AMD’s advantage in typical desktop-style single-thread tasks.

Q: Does the Intel Xeon 6736P have more cores?

A: Yes, significantly. The Xeon has 36 cores and 72 threads, versus 16 cores and 32 threads for the AMD Ryzen 9 9955HX. That core count advantage drives its wins in multi-threaded server workloads like physics (6531 vs 2720) and random string sorting (103723 vs 77890).

Q: Which processor supports more memory bandwidth?

A: The Intel Xeon 6736P by a wide margin. It uses eight-channel DDR5 with 409.6 GB/s bandwidth, while the AMD Ryzen 9 9955HX uses dual-channel DDR5 with 89.6 GB/s. This makes the Xeon better suited for memory-bound server applications.

Q: Can either CPU be overclocked?

A: Only the AMD Ryzen 9 9955HX has an unlocked multiplier. The Intel Xeon 6736P does not, meaning its clock speeds are fixed by Intel.

Q: What is the production status of each?

A: Both are marked as Active in production. The AMD part was released on 2025-01-05, and the Intel Xeon on 2025-02-23.

Q: Do both support ECC memory?

A: Yes, both the AMD Ryzen 9 9955HX and Intel Xeon 6736P support ECC memory, which is critical for server and workstation reliability.

Specification Differences

| Specification | AMD Ryzen 9 9955HX | Intel Xeon 6736P |

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

| Cores | 16 | 36 |

| Threads | 32 | 72 |

| Base Clock | 2.50 GHz | 2.00 GHz |

| Boost Clock | 5.40 GHz | 4.10 GHz |

| TDP | 55 W | 205 W |

| Socket | AMD Socket FL1 | Intel Socket 4710 |

| Architecture | Zen 5 | Granite Rapids |

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

| Die Size | 2x 70.6 mm² | 598 mm² |

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

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

| L3 Cache (shared) | 64 MB | 144 MB |

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

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

| PCIe Lanes | 28 (Gen 5) | 88 (Gen 5) |

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

| Market Segment | Mobile | Server/Workstation |

| Multiplier Unlocked | Yes | No |

| Launch MSRP | N/A | $3351 |

Head-to-Head Benchmarks

The single-thread comparison is the most lopsided result. In PassMark single-thread, the AMD Ryzen 9 9955HX scores 4393 against the Xeon’s 2024, a 117% advantage. This is the largest delta in the entire benchmark set. The Xeon’s Cinebench R23 single-core score of 6008 versus AMD’s 2174 (-63.8% for AMD) appears contradictory, but these tests measure different instruction paths; the PassMark test favors AMD’s higher boost clock and mobile-optimized design.

In multi-threaded Cinebench R23, the Xeon takes a 12.7% lead (42561 vs 37159). Yet in Cinebench R15 multi-core, AMD wins by 37.6% (5905 vs 4290). This inversion suggests the Xeon’s advantage grows with longer render times, while the AMD chip’s 55 W TDP allows it to sustain high clocks for shorter workloads. The Xeon’s 205 W TDP gives it more thermal headroom for sustained all-core loads.

The physics benchmark shows a massive Xeon win: 6531 vs 2720, a 58.4% difference. This aligns with the Xeon’s core count advantage. Similarly, random string sorting goes to Intel by 24.9% (103723 vs 77890), and data encryption by 19.3% (46236 vs 37330). Data compression is closer but still Intel’s: 796658 vs 731998, an 8.1% margin.

AMD’s wins beyond single-thread include PassMark multithread (56171 vs 50072, +12.2%) and integer math (212598 vs 206833, +2.8%). The multithread result is notable because it contradicts the Cinebench R23 outcome, indicating that PassMark’s multithread test is less cache-dependent and benefits from AMD’s higher clocks. Extended instructions also favor AMD by 4.3% (57946 vs 55563), a narrow but consistent edge in SIMD-style workloads.

The Verdict

The data supports a clear division of labor. The AMD Ryzen 9 9955HX is the better choice for single-threaded and interactive workloads, as demonstrated by its 117% lead in PassMark single-thread and 12.2% lead in PassMark multithread. Its 55 W TDP, unlocked multiplier, and integrated Radeon 610M graphics position it for mobile workstations where per-core speed and efficiency matter more than raw core counts.

The Intel Xeon 6736P is the server part. Its 36 cores and 72 threads, eight-channel memory with 409.6 GB/s bandwidth, and 144 MB L3 cache make it dominant in physics (58.4% lead), data encryption (19.3%), and random string sorting (24.9%). The 88 PCIe Gen 5 lanes and ECC support reinforce its role in data-center deployments. The $3351 launch MSRP reflects that positioning.

Neither chip is a universal winner. The AMD part wins 6 benchmarks; the Intel part wins 9. But the margins tell the story: AMD’s wins are often by small percentages (2.8% to 12.2%), while Intel’s decisive victories reach 58.4%. For workloads that can leverage 36 cores and massive memory bandwidth, the Xeon is the data-backed choice. For anything requiring fast single-thread response or running within a mobile power envelope, the Ryzen 9 9955HX is the only option between these two.