AMD EPYC 9115 vs Intel Xeon 6511P Comparison

The Intel Xeon 6511P and AMD EPYC 9115 are both 16-core, 32-thread server processors aimed at the same segment, yet the recorded data reveals two very different personalities. The EPYC 9115 takes the majority of benchmark wins, particularly in single-threaded and integer-heavy workloads, while the Xeon 6511P counters with decisive victories in floating-point math, extended instructions, and data compression. Neither chip dominates outright; instead, the choice hinges on workload character. The EPYC 9115 is the more consistent all-rounder with a clear edge in PassMark single-thread performance, while the Xeon 6511P is the specialist for compute-heavy, vectorized tasks. For buyers prioritizing raw per-core speed and memory bandwidth, the AMD part leads. For those running compression, encryption, or physics simulations, the Intel part holds distinct advantages. This analysis walks through the architecture, the head-to-head numbers, and the specification gaps that explain these outcomes.

The Verdict

The AMD EPYC 9115 is the safer default for general-purpose server work. It wins 12 of the 17 recorded head-to-head benchmarks, including every Cinebench test, all three single-core variants, and the PassMark multithread score. Its single-thread margin is enormous: 24.3% ahead in PassMark single_thread (3360 vs 2545). That gap alone makes it the pick for latency-sensitive, lightly threaded applications, database queries, or any workload where per-core responsiveness dominates. The EPYC 9115 also leads in integer math by 10.6% (181807 vs 162524) and in data encryption by 6.2% (33489 vs 31429), making it the stronger choice for security-related processing and general business logic.

The Intel Xeon 6511P is the specialist. It wins 5 benchmarks, but those wins are decisive in their domains. It leads by 11.8% in floating-point math (127307 vs 113853), by 11.7% in physics (4678 vs 4188), by 11.6% in extended instructions (50730 vs 45477), and by 6.8% in data compression (640808 vs 600099). These are not marginal edges; they are double-digit advantages in compute-intensive, vectorized workloads. For scientific computing, simulation, or any task that leans on AVX-style instruction sets, the Xeon is the clear winner. The verdict is straightforward: choose the EPYC 9115 for balanced, high-frequency performance across a broad mix, and choose the Xeon 6511P when the workload is dominated by floating-point or compression tasks.

Architecture Differences

The two chips come from fundamentally different design philosophies. The Intel Xeon 6511P uses the Granite Rapids architecture, built on Intel's 5 nm process. It features 16 cores and 32 threads, with a base clock of 2.30 GHz and a boost clock of 4.20 GHz. Its cache hierarchy is notable: 112 KB of L1 per core, 2 MB of L2 per core, and a large 72 MB shared L3 cache. Memory support is DDR5 over an eight-channel bus, delivering 409.6 GB/s of bandwidth. PCIe connectivity is Gen 5 with 136 lanes (CPU only). The chip is built by Intel itself and uses the Intel Socket 4710.

The AMD EPYC 9115 belongs to the EPYC 9005 series and uses the Zen 5 architecture, codenamed Turin. It is fabricated by TSMC on a 4 nm process, a slightly more advanced node. It also has 16 cores and 32 threads, but its clocks differ: a base of 2.60 GHz and a boost of 4.10 GHz, the latter slightly lower than Intel's. The cache layout is different: 80 KB of L1 per core, 1 MB of L2 per core, and 64 MB of shared L3, which is 8 MB less than the Xeon. The EPYC uses a twelve-channel DDR5 memory bus, which gives it a substantial bandwidth advantage: 576.0 GB/s, roughly 40% higher than Intel's 409.6 GB/s. It also has 128 PCIe Gen 5 lanes (CPU only), slightly fewer than Intel's 136. The EPYC's die size is listed as 2x 70.6 mm² with 16,630 million transistors, reflecting a chiplet design, whereas the Xeon's transistor count and die size are not recorded. Both chips support ECC memory and have no integrated graphics.

These architectural differences explain much of the benchmark behavior. The EPYC's higher base clock (2.60 vs 2.30) and its single-thread dominance suggest a more efficient core design. The Xeon's larger L3 cache (72 MB vs 64 MB) and higher boost clock (4.20 vs 4.10) may contribute to its strengths in floating-point and compression, where larger working sets and burst performance matter. The EPYC's twelve-channel memory bus is a clear advantage for bandwidth-hungry applications, though the benchmark data shows that the Xeon still wins in several compute-bound tests.

Head-to-Head Benchmarks

The Cinebench results are uniformly in favor of the AMD EPYC 9115, but the margins are consistently small. In Cinebench R15 multicore, the EPYC scores 4233 vs Intel's 4152, a 1.9% edge. The same 1.9% delta appears in R20 multicore (17641 vs 17302) and R23 multicore (42003 vs 41196). Single-core Cinebench results follow the same pattern: R15 single-core is 597 vs 586 (1.8% lead), R20 single-core is 2490 vs 2442 (1.9% lead), and R23 single-core is 5929 vs 5815 (1.9% lead). These are narrow but consistent wins, indicating that the EPYC's architecture is slightly more efficient per clock across all Cinebench workloads.

The PassMark suite tells a more polarized story. The EPYC wins big in single-thread performance: 3360 vs 2545, a 24.3% margin. It also wins in integer math by 10.6% (181807 vs 162524), in multithread by 6.6% (48936 vs 45687), in random string sorting by 3.3% (70151 vs 67809), and in data encryption by 6.2% (33489 vs 31429). These are substantial leads in core integer and general-purpose workloads.

The Xeon 6511P, however, claims the compute-heavy categories. It wins floating-point math by 11.8% (127307 vs 113853), physics by 11.7% (4678 vs 4188), extended instructions by 11.6% (50730 vs 45477), data compression by 6.8% (640808 vs 600099), and find prime numbers by 6.6% (308 vs 289). These are not small differences; they are double-digit margins in three of the five wins. The data suggests that the Xeon's core design is better suited to vectorized, floating-point-heavy instruction streams, while the EPYC excels at scalar integer work and single-threaded responsiveness.

The overall benchmark score averages reflect this split. The Xeon 6511P has an average benchmark score of 71051, which places it in the 94th percentile of all CPUs. Its nearest rivals include the Intel Core Ultra 7 265K (0.2% ahead) and the Intel Xeon Platinum 8270 (0.4% behind). The EPYC 9115 has an average score of 69288, also in the 94th percentile, with nearest rivals like the Intel Core i7-14700K (0.1% ahead) and AMD Ryzen 9 7950X (0.3% ahead). The two chips are separated by only 2.5% in average score (71051 vs 69288), yet their workload profiles are starkly different.

Specification Differences

The following fields differ between the two processors:

• Base clock: Intel 2.30 GHz vs AMD 2.60 GHz
• Boost clock: Intel 4.20 GHz vs AMD 4.10 GHz
• TDP: Intel 150 W vs AMD 125 W
• Socket: Intel Socket 4710 vs AMD Socket SP5
• Architecture: Granite Rapids vs Zen 5
• Codename: Granite Rapids vs Turin
• Process node: 5 nm (Intel) vs 4 nm (TSMC)
• Foundry: Intel vs TSMC
• Transistors: Not listed for Intel vs 16,630 million for AMD
• Die size: Not listed for Intel vs 2x 70.6 mm² for AMD
• L1 cache: 112 KB per core vs 80 KB per core
• L2 cache: 2 MB per core vs 1 MB per core
• L3 cache: 72 MB shared vs 64 MB shared
• Memory bus: Eight-channel vs Twelve-channel
• Memory bandwidth: 409.6 GB/s vs 576.0 GB/s
• PCIe lanes: 136 vs 128
• Release date: 2025-02-23 vs 2024-10-09
• Launch MSRP: $815 vs $726
• Part number: SRVU9 vs 100-000001552

The EPYC 9115 offers a higher base clock, lower TDP, more memory channels, higher memory bandwidth, and a smaller process node. The Xeon 6511P counters with a higher boost clock, larger per-core L1 and L2 caches, more total L3 cache, and more PCIe lanes. The AMD part also has a lower launch MSRP ($726 vs $815), though pricing is not the focus of this analysis.

FAQ

Q: Which processor has better single-thread performance?

A: The AMD EPYC 9115. In PassMark single_thread, it scores 3360 vs Intel's 2545, a 24.3% advantage. It also wins every Cinebench single-core test by 1.8-1.9%.

Q: Which processor is better for floating-point workloads?

A: The Intel Xeon 6511P. It leads by 11.8% in PassMark floating-point math (127307 vs 113853) and by 11.7% in PassMark physics (4678 vs 4188).

Q: How do their memory systems compare?

A: The AMD EPYC 9115 has a twelve-channel DDR5 bus with 576.0 GB/s bandwidth, while the Intel Xeon 6511P has an eight-channel bus with 409.6 GB/s. AMD offers roughly 40% more bandwidth.

Q: What is the core and thread count for each?

A: Both have 16 cores and 32 threads.

Q: Which chip has more cache?

A: The Intel Xeon 6511P has a larger L3 cache at 72 MB shared vs 64 MB shared on the EPYC. Intel also has larger per-core L1 (112 KB vs 80 KB) and L2 (2 MB vs 1 MB) caches.

Q: What are the TDP differences?

A: The Intel Xeon 6511P has a 150 W TDP, while the AMD EPYC 9115 has a 125 W TDP, making AMD the lower-power option.

Where Each One Wins

The AMD EPYC 9115 wins in every Cinebench test, every single-thread PassMark test, and in integer math, multithread, random string sorting, and data encryption. This makes it the superior choice for general-purpose server workloads, web serving, database transactions, virtualization hosts, and any application where single-threaded latency or integer throughput is critical. Its 24.3% single-thread lead is the largest margin in the entire comparison, so it is the obvious pick for workloads that cannot parallelize well. The 10.6% integer math advantage and 6.2% encryption edge further reinforce its suitability for business logic, security processing, and mixed-use servers.

The Intel Xeon 6511P wins in floating-point math, physics, extended instructions, data compression, and find prime numbers. These are precisely the workloads that stress vectorized instruction execution, scientific simulation, and data reduction. The 11.8% floating-point lead and 11.6% extended instructions lead are significant for engineering, financial modeling, or any HPC-style task. The 6.8% data compression win makes it attractive for storage servers, backup systems, or any pipeline that relies on compression algorithms. The 6.6% lead in find prime numbers hints at strength in certain mathematical or cryptographic workloads.

In summary, the EPYC 9115 is the versatile workhorse, winning 12 of 17 benchmarks and dominating single-thread and integer performance. The Xeon 6511P is the specialist, winning 5 benchmarks but with double-digit margins in three of them. The average benchmark scores are close (71051 vs 69288), so the decision should be driven by the specific workload mix. If the application is compute-heavy with floating-point or compression demands, the Xeon 6511P is the data-backed choice. If the workload is diverse, latency-sensitive, or integer-bound, the EPYC 9115 is the safer bet.