AMD EPYC 7351 vs AMD EPYC 7F32 Comparison

The AMD EPYC 7351 and AMD EPYC 7F32 present a fascinating case study in generational contrast. The 7351 is a 16-core, 32-thread Naples part from the first-generation EPYC line, while the 7F32 is an 8-core, 16-thread Rome processor from the second generation. Despite these stark architectural differences, their benchmark scores are nearly identical, with the 7351 taking a razor-thin 0.1% lead in average score. This raises a compelling question: does core count trump architectural efficiency, or is the 7F32's advanced design simply compensating for a smaller footprint? The data suggests a statistical dead heat in raw throughput, but the underlying specifications reveal two entirely different design philosophies aimed at distinct server workloads.

Where Each One Wins

The direct head-to-head benchmark data shows a complete sweep for the AMD EPYC 7351, winning all six Cinebench tests. However, the margin of victory is so minuscule that it is practically negligible. In Cinebench R15 multicore, the 7351 scores 1989 against the 7F32's 1987, a delta of just 0.1%. This pattern repeats across all tests, with the largest gap being a 0.2% advantage for the 7351 in Cinebench R20 singlecore (1170 vs 1168). The 7351's wins are consistent but not substantial, indicating that its double the core count (16 vs 8) and four times the thread count (32 vs 16) are effectively neutralized by the 7F32's superior per-core performance.

The real distinction lies in how these processors achieve their scores. The 7351 leverages its massive parallelism, while the 7F32 relies on its higher clock speeds and newer architecture. In single-threaded workloads, the 7F32 is virtually tied with the 7351, which is remarkable given that the 7F32's base clock is 3.70 GHz compared to the 7351's 2.40 GHz. This suggests the 7351's Zen architecture is less efficient per clock, but its sheer volume of cores makes up for it. For workloads that scale linearly with cores, such as heavily threaded rendering or virtualization, the 7351 has a theoretical edge. For lightly threaded tasks, the 7F32's higher frequency and newer Zen 2 core design make it the more responsive choice, even if the benchmarks show a tie.

Architecture Differences

The architectural gap between these two CPUs is generational. The EPYC 7351 is built on the original Zen architecture, codenamed Naples, using a 14 nm process from GlobalFoundries. It packs 4,800 million transistors on a 213 mm² die. In contrast, the EPYC 7F32 uses the Zen 2 architecture, codenamed Rome, fabricated on TSMC's 7 nm process. This newer node allows for a staggering 15,200 million transistors, spread across four 74 mm² chiplets. This chiplet design is a fundamental shift, enabling higher yields and more flexible configurations.

Cache hierarchies also differ significantly. The 7351 has a shared 64 MB L3 cache, while the 7F32 provides 32 MB per die, totaling 128 MB. This doubling of total L3 cache in the 7F32 is a major advantage for database workloads and in-memory processing. Per-core L1 cache is also different: the 7351 has 96 KB per core, while the 7F32 has 64 KB per core, suggesting a different internal design trade-off. The 7F32 also supports PCIe Gen 4 with 128 lanes (CPU only), while the 7351 is limited to PCIe Gen 3, halving the potential I/O bandwidth for NVMe storage and accelerators. Memory bandwidth is another differentiator, with the 7F32 offering 204.8 GB/s versus the 7351's 170.6 GB/s, both over eight-channel DDR4.

FAQ

Q: Which processor has more cores and threads?

A: The AMD EPYC 7351 has 16 cores and 32 threads, while the AMD EPYC 7F32 has 8 cores and 16 threads. The 7351 offers double the parallel processing capability.

Q: Is the newer AMD EPYC 7F32 significantly faster in single-core tests?

A: No. In Cinebench R23 singlecore, the 7351 scores 2787 and the 7F32 scores 2783, a 0.1% difference. The 7F32's higher clock speed does not translate into a measurable single-thread victory.

Q: What is the difference in their memory bandwidth?

A: The EPYC 7F32 has a higher memory bandwidth of 204.8 GB/s, while the EPYC 7351 is rated at 170.6 GB/s. Both support eight-channel DDR4 memory.

Q: Do both processors use the same socket?

A: Yes, both the AMD EPYC 7351 and the AMD EPYC 7F32 use the AMD Socket SP3. They are physically compatible with the same platform.

Q: Which CPU has a larger total L3 cache?

A: The AMD EPYC 7F32 has a total L3 cache of 128 MB (32 MB per die), which is double the 64 MB shared L3 cache found on the AMD EPYC 7351.

Q: What is the process node for each chip?

A: The EPYC 7351 uses a 14 nm process from GlobalFoundries, while the EPYC 7F32 uses a more advanced 7 nm process from TSMC.

Specification Differences

The specification sheet reveals a clear generational divide. The most obvious difference is core count: 16 cores for the 7351 versus 8 cores for the 7F32, with corresponding thread counts of 32 and 16. Clock speeds favor the 7F32 significantly, with a base clock of 3.70 GHz and boost of 3.90 GHz, compared to the 7351's 2.40 GHz base and 2.90 GHz boost. Thermal design power is close, with the 7351 at 170 W and the 7F32 at 180 W, meaning the 7F32 delivers its higher clocks and newer architecture at a slightly higher power envelope.

The manufacturing process and transistor count are starkly different: 14 nm with 4,800 million transistors for the 7351 versus 7 nm with 15,200 million for the 7F32. This results in different die sizes, with the 7351 using a single 213 mm² die and the 7F32 using four 74 mm² chiplets. Cache configurations differ, with the 7351 offering 96 KB L1 per core and the 7F32 offering 64 KB L1 per core, while their L2 caches are identical at 512 KB per core. The L3 cache is 64 MB shared on the 7351 versus 32 MB per die (128 MB total) on the 7F32. PCIe support also differs, with the 7351 using Gen 3 and the 7F32 using Gen 4 with 128 lanes. Finally, the 7F32 has a launch MSRP of $2100, while no launch MSRP is listed for the 7351.

Head-to-Head Benchmarks

The benchmark results are remarkably consistent, with the 7351 winning every test by a hair. In Cinebench R15 multicore, the 7351 scores 1989 versus 1987 for the 7F32, a 0.1% advantage. The R15 singlecore test is a perfect tie at 280 points for both. Moving to Cinebench R20, the 7351 leads again in multicore with 8291 against 8281 (0.1% delta), and in singlecore with 1170 against 1168 (0.2% delta). The most modern test, Cinebench R23, shows the same pattern: 19742 for the 7351 versus 19718 for the 7F32 in multicore, and 2787 versus 2783 in singlecore, both with a 0.1% delta.

These numbers tell a story of architectural convergence. The 7F32, with half the cores, manages to match the 7351's throughput because each of its Zen 2 cores is substantially more powerful. The 7F32's higher boost clock of 3.90 GHz, compared to the 7351's 2.90 GHz, allows it to close the gap in heavily threaded scenarios where core count should dominate. The 7351's win in all six tests, while statistically minor, does indicate that the older chip's raw thread count is still a decisive factor in Cinebench's rendering workloads. However, the 0.2% maximum delta suggests that in real-world applications, these two processors would be functionally indistinguishable in raw compute performance.

The Verdict

The data points to a clear, albeit counterintuitive, conclusion: the choice between these two processors depends entirely on workload characteristics, not raw benchmark scores. For workloads that are explicitly designed to utilize many threads, such as large-scale virtualization, database servers with many concurrent sessions, or batch rendering, the AMD EPYC 7351's 16 cores and 32 threads provide a theoretical advantage. Its consistent, if narrow, wins in all multicore tests support this, even if the margin is only 0.1%.

Conversely, the AMD EPYC 7F32 is the more logical choice for latency-sensitive or single-threaded workloads. Its much higher clock speeds (3.70 GHz base vs 2.40 GHz) and newer Zen 2 architecture offer better per-core responsiveness. The doubling of total L3 cache (128 MB vs 64 MB) is a significant asset for in-memory computing and large data sets. The support for PCIe Gen 4 also makes it a future-proof option for high-bandwidth storage and networking. The 7F32's launch MSRP of $2100 provides a reference point, but the 7351's lack of an MSRP makes a direct economic comparison impossible. Ultimately, the benchmarks show a tie, but the specification differences reveal that the 7F32 achieves this parity with half the cores, making it the more efficient and modern design, while the 7351 wins on sheer core count.