AMD EPYC 7251 vs AMD Ryzen 7 PRO 1700 Comparison

The AMD EPYC 7251 and AMD Ryzen 7 PRO 1700 are two 8-core, 16-thread processors from the same Zen generation, yet they are aimed at radically different markets. The data in this comparison reveals a fascinating case of two chips sharing a DNA but diverging in purpose, with the EPYC 7251 consistently edging out its desktop sibling in every benchmark recorded, despite the Ryzen's higher clock speeds. This analysis dissects the benchmark results, architectural differences, and practical use-case implications to understand what separates a server workhorse from a professional desktop part.

Head-to-Head Benchmarks

The benchmark suite tells a story of narrow but absolute consistency. The AMD EPYC 7251 wins all six recorded Cinebench tests, with the margin hovering tightly around 1.6% to 1.7%. In the Cinebench R15 multicore test, the EPYC 7251 scores 1279 against the Ryzen 7 PRO 1700's 1259, a 1.6% lead. The single-core R15 test shows a similar pattern: 180 versus 177, a 1.7% advantage for the EPYC. This pattern holds in newer workloads, with the R20 multicore scores at 5331 versus 5246 (1.6%) and single-core at 752 versus 740 (1.6%). The R23 results mirror this exactly, with the EPYC leading 12694 to 12491 in multicore and 1792 to 1763 in single-core, both showing a 1.6% gap.

What is striking is not the magnitude but the uniformity of the victory. The EPYC 7251 does not just win; it wins by almost the same percentage across every iteration of Cinebench, from the older R15 to the more demanding R23. This suggests a fundamental, consistent performance advantage rather than a workload-specific quirk. When placed against the broader field, the EPYC 7251 sits at the 56th percentile of all CPUs with an average benchmark score of 3671, while the Ryzen 7 PRO 1700 sits at the 55th percentile with an average of 3613. The EPYC's nearest rivals include the Ryzen 7 PRO 1700X at a 0.1% higher average score and the EPYC 7301 at 0.4% higher, while the Ryzen 7 PRO 1700's closest competitor is the Intel Xeon E-2276G at a 0.0% delta, highlighting how close these processors are to their immediate peers.

Architecture Differences

Both processors are built on the same foundational Zen architecture, manufactured on a 14 nm process at GlobalFoundries, with identical transistor counts of 4,800 million and a die size of 213 mm². The cores and threads are identical at 8 and 16, respectively. The divide begins with the memory subsystem and platform. The EPYC 7251, from the Naples codename generation, supports DDR4 memory across an eight-channel bus, yielding a massive memory bandwidth of 153.6 GB/s. In stark contrast, the Ryzen 7 PRO 1700, from the Summit Ridge codename, uses a dual-channel memory bus with a bandwidth of just 42.7 GB/s. This is a four-fold difference in theoretical memory throughput, a critical factor for server workloads that are often memory-bound.

Cache allocation also differs significantly. Both share the same 96 KB of L1 and 512 KB of L2 cache per core, but the EPYC 7251 boasts 32 MB of shared L3 cache, double the 16 MB found on the Ryzen 7 PRO 1700. This larger L3 pool on the EPYC likely contributes to its superior benchmark performance, as it reduces the need to access slower system memory. The platform-level differences are stark: the EPYC 7251 uses AMD Socket SP3, while the Ryzen 7 PRO 1700 uses Socket AM4. The EPYC also supports PCIe Gen 3, while the Ryzen's listing specifies Gen 3 with 16 lanes (CPU only), a far more limited connectivity profile. Both processors support ECC memory, but the EPYC's eight-channel design is clearly built for maximum memory capacity and throughput, whereas the Ryzen's dual-channel setup is typical for desktop platforms.

Where Each One Wins

Based strictly on the benchmark data, the EPYC 7251 wins in every tested category. There is no benchmark where the Ryzen 7 PRO 1700 comes out ahead. However, the data also reveals a nuance: the EPYC's wins are marginal, never exceeding 1.7%. This means that in purely compute-bound tasks like the Cinebench rendering workloads, the two processors are nearly interchangeable in performance. The EPYC's advantage is likely amplified in real-world server environments, where its 153.6 GB/s memory bandwidth and 32 MB L3 cache can be fully utilized by multi-threaded, memory-intensive applications. The Ryzen 7 PRO 1700, despite its lower TDP of 65 watts versus the EPYC's 120 watts, cannot leverage these architectural advantages due to its dual-channel memory bus and smaller cache.

The victory for the EPYC is a triumph of platform architecture over raw clock speed. The Ryzen 7 PRO 1700 has a higher base clock of 3.00 GHz and a boost clock of 3.70 GHz, compared to the EPYC's 2.10 GHz and 2.90 GHz. Yet, the EPYC still manages to outperform it in every test. This implies that the larger L3 cache and higher memory bandwidth more than compensate for the 0.9 GHz deficit in base clock and 0.8 GHz deficit in boost clock. For a desktop user, the Ryzen's higher clocks would be preferable for lightly-threaded tasks, but the data shows that even in single-core tests, the EPYC holds a lead. This suggests that the memory subsystem benefits outweigh the clock speed penalty even in scenarios where memory bandwidth is less critical.

Specification Differences

The specification sheets for these two processors highlight their divergent design goals. The core and thread counts are identical (8 cores, 16 threads), as are the process node (14 nm), foundry (GlobalFoundries), transistor count (4,800 million), die size (213 mm²), and L1/L2 cache configurations. The key differences are in the following fields:

• Base Clock: EPYC 7251 at 2.10 GHz vs. Ryzen 7 PRO 1700 at 3.00 GHz
• Boost Clock: EPYC 7251 at 2.90 GHz vs. Ryzen 7 PRO 1700 at 3.70 GHz
• TDP: EPYC 7251 at 120 W vs. Ryzen 7 PRO 1700 at 65 W
• Socket: EPYC 7251 on Socket SP3 vs. Ryzen 7 PRO 1700 on Socket AM4
• Codename: EPYC 7251 (Naples) vs. Ryzen 7 PRO 1700 (Summit Ridge)
• L3 Cache: EPYC 7251 at 32 MB (shared) vs. Ryzen 7 PRO 1700 at 16 MB (shared)
• Memory Bus: EPYC 7251 at Eight-channel vs. Ryzen 7 PRO 1700 at Dual-channel
• Memory Bandwidth: EPYC 7251 at 153.6 GB/s vs. Ryzen 7 PRO 1700 at 42.7 GB/s
• PCIe: EPYC 7251 at Gen 3 vs. Ryzen 7 PRO 1700 at Gen 3, 16 Lanes (CPU only)
• Market Segment: EPYC 7251 at Server/Workstation vs. Ryzen 7 PRO 1700 at Desktop

FAQ

Q: Which processor is faster in multi-core workloads?

A: The AMD EPYC 7251 is faster in all recorded multi-core tests. In Cinebench R23 multicore, it scores 12694 versus 12491 for the Ryzen 7 PRO 1700, a 1.6% advantage.

Q: Does the Ryzen 7 PRO 1700 win any benchmark?

A: No. The head-to-head data shows the EPYC 7251 winning all 6 benchmarks (Cinebench R15, R20, and R23 in both single-core and multicore variants). The Ryzen 7 PRO 1700 has 0 wins.

Q: How do their memory bandwidths compare?

A: The EPYC 7251 has a significantly higher memory bandwidth of 153.6 GB/s due to its eight-channel memory bus. The Ryzen 7 PRO 1700 has a dual-channel bus, resulting in a bandwidth of 42.7 GB/s.

Q: Are the core counts the same?

A: Yes, both the AMD EPYC 7251 and the AMD Ryzen 7 PRO 1700 have 8 cores and 16 threads.

Q: What is the difference in L3 cache size?

A: The EPYC 7251 has 32 MB of shared L3 cache, while the Ryzen 7 PRO 1700 has 16 MB of shared L3 cache. This is a 2x difference.

Q: Which processor has a higher boost clock?

A: The AMD Ryzen 7 PRO 1700 has a higher boost clock at 3.70 GHz, compared to the EPYC 7251's 2.90 GHz. Despite this, the EPYC still achieves higher benchmark scores.

The Verdict

The data directs a clear, if counterintuitive, conclusion: the AMD EPYC 7251 is the superior processor in terms of raw benchmark performance, despite its lower clock speeds and higher TDP. It wins every single benchmark test against the Ryzen 7 PRO 1700, with margins consistently around 1.6%. The EPYC's advantage is rooted in its server-class architecture—the eight-channel memory bus providing 153.6 GB/s of bandwidth and the larger 32 MB L3 cache. These features are designed to feed many cores in demanding server environments, and they appear to provide a tangible benefit even in desktop-style rendering workloads.

For a user building a high-performance desktop or workstation, the Ryzen 7 PRO 1700 presents a more practical choice due to its significantly lower TDP of 65 watts and compatibility with the mainstream AM4 socket. Its higher clock speeds (3.00 GHz base, 3.70 GHz boost) are also more conventional for desktop use. However, the benchmark results show that this does not translate into a performance win. For a server or workstation environment where memory bandwidth and cache capacity are paramount, the EPYC 7251 is the clear winner, offering a consistent, albeit modest, performance lead. The choice is not between speed and efficiency, but between a desktop part that loses its benchmark battles and a server part that, despite its clock speed disadvantage, wins them all.