AMD EPYC 9255 vs Intel Xeon 6527P Comparison

The AMD EPYC 9255 and Intel Xeon 6527P are two 24-core server processors that land within 1% of each other in average benchmark score. The AMD part averages 116,388 versus Intel’s 115,190, a margin that could easily be dismissed as noise. Yet the head-to-head data reveals a clear split in workload personality. AMD wins 13 of 17 benchmark comparisons, while Intel takes four. The interesting story is not the overall average but where each chip dominates. The AMD EPYC 9255 is the consistent winner in CPU-intensive throughput and single-threaded tasks, while the Intel Xeon 6527P carves out a niche in memory-bandwidth and data-formatting workloads. Below is a breakdown of what each processor does best, based strictly on the recorded benchmark results.

Where Each One Wins

The AMD EPYC 9255 is the general-purpose compute champion. It wins every Cinebench test, both single-core and multi-core, by margins ranging from 1.6% to 1.7%. In PassMark’s integer-heavy workloads, the lead widens dramatically: integer math shows a 13.9% advantage (306,442 vs. 268,985), and prime number finding is 14.2% faster (580 vs. 508). The physics test is the single largest win for AMD, at 21.2% (9,740 vs. 8,037). Extended instructions also favor AMD by 5% (75,185 vs. 71,600). The single-thread PassMark score is 3.3% higher (3,655 vs. 3,539). Simply put, if a workload relies on raw arithmetic, branch prediction, or single-core responsiveness, the EPYC 9255 is the pick.

The Intel Xeon 6527P wins in four specific PassMark sub-tests: data compression, data encryption, floating-point math, and random string sorting. The largest win for Intel is floating-point math, where it scores 195,005 versus 183,367, a 6% advantage. Data compression is 1.2% higher (1,030,818 vs. 1,018,904), data encryption is 1.1% higher (60,333 vs. 59,668), and random string sorting is 1.8% higher (131,597 vs. 129,202). These are not trivial differences, but they are concentrated in a narrow band of memory-bound or vector-heavy operations. For general server consolidation, mixed workloads, or virtualized environments, the AMD part’s broader wins make it the safer choice. Intel’s victories suggest a more specialized role, such as database compression or scientific floating-point simulation.

Architecture Differences

The two chips come from fundamentally different design philosophies. The AMD EPYC 9255 is built on the Zen 5 architecture, codenamed Turin, manufactured on a 4 nm process at TSMC. The die is composed of four chiplets, each 70.6 mm², totaling 33,260 million transistors. The Intel Xeon 6527P uses the Granite Rapids architecture, also its codename, on Intel’s 5 nm process, with a single monolithic die of 598 mm². The transistor count for Intel is not listed. This difference in packaging — chiplet vs. monolithic — likely explains why AMD reports a 4x die size figure while Intel has one large piece of silicon.

Cache hierarchies also differ. AMD allocates 80 KB of L1 per core and 1 MB of L2 per core, with a shared 128 MB L3. Intel provides more per-core L1 and L2: 112 KB and 2 MB respectively, plus a larger 144 MB shared L3. Despite Intel’s larger caches, AMD’s aggregate benchmark wins suggest that Zen 5’s memory hierarchy is more efficient for typical integer and single-threaded code. Memory support is another differentiator: both support DDR5 ECC, but AMD uses a twelve-channel memory bus with 576.0 GB/s of bandwidth, while Intel uses eight channels with 409.6 GB/s. This 166.4 GB/s gap in theoretical bandwidth is substantial, yet Intel still wins the floating-point and compression tests — a reminder that memory bandwidth is not the sole determinant of performance.

PCIe lane counts also diverge. AMD offers Gen 5 with 128 lanes (CPU only), while Intel provides Gen 5 with 88 lanes (CPU only). For systems with many NVMe drives or GPUs, the AMD part has more headroom. Both processors are locked (multiplier unlocked: false), both lack integrated graphics, and both are marked as active production parts. The AMD release date is October 2024, while Intel’s is February 2025, making the Xeon the newer silicon by several months.

Head-to-Head Benchmarks

The Cinebench suite shows a consistent, narrow AMD lead. In R15 multi-core, AMD scores 6,483 vs. Intel’s 6,378, a 1.6% advantage. Single-core R15 is 915 vs. 900, also 1.7% ahead. R20 multi-core repeats the pattern: 27,013 vs. 26,576 (1.6%), and R20 single-core is 3,813 vs. 3,751 (1.7%). R23 multi-core lands at 64,318 vs. 63,278 (1.6%), and R23 single-core at 9,080 vs. 8,933 (1.6%). These margins are uniform, suggesting the AMD architecture holds a clock-for-clock efficiency edge. The base clock difference (3.25 GHz vs. 3.00 GHz) and boost clock difference (4.80 GHz vs. 4.20 GHz) likely contribute, but the TDP picture is more complex: AMD is rated at 200W, while Intel is rated at 255W. Despite the lower TDP, AMD wins every Cinebench test, which implies better performance-per-watt.

PassMark results are where the story gets more interesting. AMD wins extended instructions by 5% (75,185 vs. 71,600) and integer math by 13.9% (306,442 vs. 268,985). The prime number test is a landslide for AMD: 580 vs. 508, a 14.2% win. Physics is the biggest gap: 9,740 vs. 8,037, a 21.2% advantage for AMD. Multi-threaded PassMark also favors AMD at 2.9% (76,580 vs. 74,445). Single-thread PassMark is 3.3% higher for AMD (3,655 vs. 3,539). These results indicate that Zen 5’s integer execution units and branch handling are significantly stronger than Granite Rapids’ in these specific tests.

Intel’s wins are narrower but real. Floating-point math is the standout: 195,005 vs. 183,367, a 6% gap. Data compression is 1,030,818 vs. 1,018,904 (1.2% higher), data encryption is 60,333 vs. 59,668 (1.1% higher), and random string sorting is 131,597 vs. 129,202 (1.8% higher). Notably, Intel’s floating-point victory is larger than any single AMD win except physics. This suggests that for scientific computing or financial modeling with heavy double-precision math, the Xeon 6527P may be the better fit, despite losing the overall average. The data implies that Intel’s larger L2 and L3 caches help in data-streaming scenarios, but not enough to overcome AMD’s raw integer throughput.

FAQ

Q: Which processor has a higher boost clock?

A: The AMD EPYC 9255 boosts to 4.80 GHz, while the Intel Xeon 6527P boosts to 4.20 GHz. This 0.6 GHz difference aligns with AMD’s single-thread benchmark wins.

Q: Does the Intel Xeon 6527P win any benchmark by a large margin?

A: Yes. Intel’s largest win is in PassMark floating-point math, where it scores 195,005 versus AMD’s 183,367, a 6% advantage. No other Intel win exceeds 1.8%.

Q: What is the average benchmark score difference between the two?

A: The AMD EPYC 9255 averages 116,388, and the Intel Xeon 6527P averages 115,190. The AMD part is 1% higher, and both sit at the 97th percentile among all CPUs.

Q: Which chip has more PCIe lanes?

A: The AMD EPYC 9255 offers Gen 5 with 128 lanes (CPU only), while the Intel Xeon 6527P provides Gen 5 with 88 lanes (CPU only). This gives AMD more expansion headroom.

Q: How do the cache sizes compare?

A: Intel has larger per-core L1 (112 KB vs. 80 KB) and L2 (2 MB vs. 1 MB), plus a larger shared L3 (144 MB vs. 128 MB). Despite this, AMD wins most cached workloads, indicating better cache efficiency.

Q: Are these processors unlocked for overclocking?

A: No. Both the AMD EPYC 9255 and Intel Xeon 6527P have multiplier unlocked set to false, meaning they are locked parts for server use.

Specification Differences

| Specification | AMD EPYC 9255 | Intel Xeon 6527P |

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

| Base Clock | 3.25 GHz | 3.00 GHz |

| Boost Clock | 4.80 GHz | 4.20 GHz |

| TDP | 200 W | 255 W |

| Socket | AMD Socket SP5 | Intel Socket 4710 |

| Architecture | Zen 5 | Granite Rapids |

| Process Node | 4 nm | 5 nm |

| Foundry | TSMC | Intel |

| Die Size | 4x 70.6 mm² | 598 mm² |

| Transistors | 33,260 million | Not listed |

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

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

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

| Memory Bus | Twelve-channel | Eight-channel |

| Memory Bandwidth | 576.0 GB/s | 409.6 GB/s |

| PCIe | Gen 5, 128 Lanes | Gen 5, 88 Lanes |

| Release Date | 2024-10-09 | 2025-02-23 |

| Launch MSRP | $2495 | $2878 |

| Part Number | 100-000000694 | SRVNY |

The Verdict

The data points to a clear choice for most workloads: the AMD EPYC 9255. It wins 13 of 17 benchmark comparisons, including every Cinebench test and the majority of PassMark’s CPU-heavy metrics. Its integer math advantage of 13.9% and physics advantage of 21.2% are decisive for general compute, virtualization, and database workloads that are not purely floating-point. The 1% higher average benchmark score, combined with a 55W lower TDP and a 3.25 GHz base clock versus 3.00 GHz, makes it the more efficient performer on paper. The launch MSRP of $2495 for AMD versus $2878 for Intel also favors AMD, though pricing is secondary to the benchmark evidence.

The Intel Xeon 6527P is not without merit. Its 6% floating-point math win and 1.8% random string sorting win suggest it handles memory-streaming and vector math better. For scientific simulations, financial risk modeling, or any workload dominated by double-precision arithmetic, the Xeon’s larger caches and higher TDP appear to translate into tangible gains. However, those wins are isolated to four sub-tests, and the AMD part’s single-thread superiority (3.3% in PassMark, 1.6-1.7% in Cinebench) makes it more responsive for interactive or latency-sensitive applications. The verdict is straightforward: pick the AMD EPYC 9255 for balanced, high-throughput server workloads. Choose the Intel Xeon 6527P only if your specific application is proven to be floating-point or compression bound, where its 6% and 1-2% edges justify the higher power draw and newer release date.