AMD EPYC 7281 vs AMD EPYC 7351P Comparison

The AMD EPYC 7351P and AMD EPYC 7281 are two 16-core server processors from the same Naples generation, yet benchmark data reveals a consistent and significant performance gap between them. Both chips share the same fundamental architecture, socket, and power envelope, but the 7351P pulls ahead in every measured workload, making the comparison less about architectural philosophy and more about clock speed and cache allocation.

Head-to-Head Benchmarks

The data is unambiguous: the AMD EPYC 7351P wins all six head-to-head benchmark comparisons, with every single victory falling within a remarkably narrow range of 20.3% to 20.5%. This uniformity across different Cinebench versions and workload types suggests a systematic advantage rather than workload-specific optimization.

In Cinebench R15 multicore, the 7351P scores 2231 against the 7281's 1852, a 20.5% lead. The single-core R15 test shows a nearly identical margin, with 314 versus 261, a 20.3% difference. This pattern repeats exactly in Cinebench R20: the multicore score of 9296 versus 7718 represents a 20.4% advantage, while the single-core result of 1312 against 1089 is a 20.5% gap.

The newest benchmark in the set, Cinebench R23, continues the trend. The 7351P achieves 22135 in multicore compared to 18377 for the 7281, a 20.4% difference, and 3125 versus 2594 in single-core, another 20.5% margin. The consistency of these deltas — all within 0.2 percentage points of each other — strongly implies that the performance difference scales linearly across both single-threaded and multi-threaded tasks.

Looking at the broader benchmark landscape, the average benchmark score for the 7351P is 5469, placing it at the 61st percentile of all CPUs. The 7281 averages 5315, sitting at the 60th percentile. Despite the large head-to-head margins, both chips occupy nearly the same position in the overall CPU hierarchy, which suggests that the 7351P's advantage is meaningful but not transformative in the context of the entire processor market.

Architecture Differences

Both processors are built on the same Zen architecture with the Naples codename, manufactured on a 14 nm process at GlobalFoundries. They share identical transistor counts of 4,800 million and the same die size of 213 mm². The socket is the same AMD Socket SP3, and both support DDR4 memory across an eight-channel bus with 170.6 GB/s of bandwidth. ECC memory is supported on both, and PCIe Gen 3 connectivity is standard.

The core and thread counts are identical: 16 cores and 32 threads. The L1 and L2 caches match as well, with 96 KB per core and 512 KB per core respectively. The most significant architectural divergence lies in the L3 cache. The 7351P carries 64 MB of shared L3 cache, while the 7281 is equipped with only 32 MB. This 32 MB difference is likely a major contributor to the performance gap, as larger shared caches can reduce memory latency and improve data locality in multi-threaded server workloads.

Clock speeds also differ noticeably. The 7351P has a base clock of 2.40 GHz and a boost clock of 2.90 GHz. The 7281 operates at a lower 2.10 GHz base and 2.70 GHz boost. The 300 MHz base clock difference and 200 MHz boost difference translate directly into the roughly 20% performance advantage observed in the benchmarks. Both chips have a TDP of 170 watts and feature an unlocked multiplier, although the practical implications of overclocking on server platforms may be limited.

The production status for both is listed as Active, and both were released on the same date in 2017. The 7351P has a part number of PS735PBEVGPAF, while the 7281's part number is not listed. Neither processor has an integrated GPU, and no launch MSRP is provided for either.

Where Each One Wins

The AMD EPYC 7351P wins everywhere in this comparison, but the nature of those wins is instructive. In single-core benchmarks, the 7351P's higher boost clock of 2.90 GHz versus 2.70 GHz gives it a clear edge in lightly threaded tasks. The R15 single-core result of 314 versus 261, a 20.3% lead, demonstrates that even a single thread benefits substantially from the higher frequency ceiling.

In multi-core workloads, the 7351P's advantages compound. The combination of higher base clock (2.40 GHz versus 2.10 GHz) and doubled L3 cache (64 MB versus 32 MB) allows all 16 cores to sustain better performance under load. The R23 multicore score of 22135 versus 18377, a 20.4% margin, shows that the 7351P scales effectively across all cores without thermal or power throttling diminishing its lead.

The 7281 is not without merit in specific scenarios. Its lower clocks mean it consumes the same 170-watt TDP while delivering less performance, but for workloads that are memory-bandwidth-bound rather than compute-bound, the identical eight-channel DDR4 support and 170.6 GB/s bandwidth mean both chips offer the same memory throughput. In such cases, the 7281's deficit may be less pronounced, though the benchmark data does not include memory-specific tests to confirm this.

For virtualized environments or containerized workloads where the L3 cache size matters less due to isolated working sets, the 7281's smaller 32 MB cache may be sufficient. The benchmark results, however, show no such scenario favoring the 7281 in the tested applications.

FAQ

Q: Why does the AMD EPYC 7351P outperform the 7281 by such a consistent margin?

A: The 7351P has a higher base clock (2.40 GHz versus 2.10 GHz) and boost clock (2.90 GHz versus 2.70 GHz) while also featuring double the L3 cache (64 MB versus 32 MB). These differences produce a nearly uniform 20.3-20.5% advantage across all Cinebench tests.

Q: Are these processors identical in core count and thread count?

A: Yes, both the 7351P and 7281 have 16 cores and 32 threads. They are built on the same 14 nm Zen architecture with the same 4,800 million transistors and 213 mm² die size.

Q: Do both processors support the same memory configuration?

A: Yes, both support DDR4 memory with an eight-channel bus and 170.6 GB/s bandwidth, and both have ECC memory support. The memory bandwidth is identical, so the performance gap cannot be attributed to memory subsystem differences.

Q: Which processor has a better single-core performance?

A: The 7351P wins all single-core benchmarks, with a 20.3% lead in Cinebench R15 (314 versus 261) and a 20.5% lead in Cinebench R23 (3125 versus 2594). This is driven by its higher boost clock of 2.90 GHz.

Q: Is the 7281 ever a better choice based on benchmark data?

A: No, the 7351P wins all six head-to-head benchmarks. The 7281's only potential advantage would be in scenarios not covered by these tests, such as memory-bandwidth-bound workloads where both chips offer identical 170.6 GB/s throughput.

Q: How do these processors compare to their nearest rivals?

A: The 7351P's average benchmark score of 5469 is nearly identical to the Intel Xeon W-1290P (5443, 0.5% delta) and AMD Ryzen Threadripper 1920 (5425, 0.8% delta). The 7281's average of 5315 matches the Intel Core i9-10900KF (5316, 0% delta) closely.

The Verdict

The data points decisively toward the AMD EPYC 7351P as the superior processor in nearly every measurable way. It wins all six benchmark comparisons with a consistent 20%+ margin, has a higher base and boost clock, and offers twice the L3 cache. For any workload represented in the Cinebench suite — whether single-threaded or multi-threaded — the 7351P is the clear pick.

The 7281's only defense is its identical memory bandwidth and eight-channel support, which could matter in specific server scenarios where memory throughput is the bottleneck. But the benchmark results show no evidence of such a scenario favoring the 7281. Both processors sit at similar percentiles (61st versus 60th) and have similar average scores (5469 versus 5315) compared to all CPUs, but the head-to-head comparison is one-sided.

Buyers should choose the 7351P if they prioritize raw compute performance in single-threaded and multi-threaded applications. The 7281 may be acceptable for workloads where its lower clocks are mitigated by memory-bound behavior, but the 20% performance deficit makes it difficult to justify when the 7351P offers identical power consumption (170 watts) and the same platform compatibility.

Specification Differences

The following specifications differ between the AMD EPYC 7351P and AMD EPYC 7281:

• Base Clock: 2.40 GHz (7351P) versus 2.10 GHz (7281)
• Boost Clock: 2.90 GHz (7351P) versus 2.70 GHz (7281)
• L3 Cache: 64 MB shared (7351P) versus 32 MB shared (7281)
• Part Number: PS735PBEVGPAF (7351P) versus not listed (7281)

All other specifications are identical: 16 cores, 32 threads, 170-watt TDP, AMD Socket SP3, Zen architecture, Naples codename, 14 nm process, GlobalFoundries foundry, 4,800 million transistors, 213 mm² die size, 96 KB L1 per core, 512 KB L2 per core, DDR4 memory support, eight-channel memory bus, 170.6 GB/s memory bandwidth, ECC memory support, PCIe Gen 3, no integrated graphics, Server/Workstation market segment, Active production status, and an unlocked multiplier.