AMD EPYC 7551P vs Intel Core i5-6500 Comparison

The Intel Core i5-6500 and AMD EPYC 7551P occupy opposite ends of the computing spectrum, and the benchmark data reflects this clearly. Out of eight head-to-head tests, the EPYC 7551P wins seven, including every multi-threaded workload and most single-core tests, while the i5-6500 manages a single victory in Geekbench single-core. The data shows a 32-core, 64-thread server processor overwhelming a 4-core, 4-thread desktop part in raw throughput, yet the i5 still holds a notable edge in one specific legacy single-thread test, making the choice between them entirely dependent on workload type.

Where Each One Wins

The AMD EPYC 7551P dominates every scenario that scales with core count and memory bandwidth. Its 32 cores and 64 threads allow it to post a Cinebench R23 multi-core score of 32,500, which is 85.4% higher than the i5-6500’s 4,760. This pattern repeats across all Cinebench multi-core tests and Geekbench multi-core, where the EPYC’s 6,296 score is 50.5% ahead of the i5’s 3,118. For rendering, scientific computing, virtualization, or any parallel workload, the EPYC 7551P is the clear winner. Its eight-channel memory bus, delivering 170.6 GB/s of bandwidth versus the i5’s dual-channel 34.1 GB/s, further reinforces its advantage in memory-hungry server tasks. The EPYC also wins in Cinebench single-core tests, scoring 4,588 in R23 single-core versus the i5’s 672, an 85.4% margin that shows even lightly-threaded rendering tasks favor the server chip.

The Intel Core i5-6500 wins exactly one head-to-head test: Geekbench single-core, where it scores 1,099 against the EPYC’s 919, a 19.6% advantage. This suggests that for extremely latency-sensitive, single-threaded legacy applications that do not benefit from the EPYC’s architecture, the i5 can still offer better responsiveness. The i5 also carries integrated HD Graphics 530, which the EPYC lacks entirely, making it the only option of the two for a system without a discrete GPU. For a desktop user running older software, light productivity, or basic graphical output, the i5-6500 has a functional niche despite its massive throughput deficit.

Architecture Differences

The two processors are built on fundamentally different designs despite sharing the same 14 nm process node. The i5-6500 uses Intel’s Skylake architecture, fabricated by Intel, with a die size of 177 mm². The EPYC 7551P uses AMD’s Zen architecture, codenamed Naples, fabricated by GlobalFoundries, with a larger 213 mm² die and 4,800 million transistors. The core counts diverge sharply: the i5 has 4 cores and 4 threads, while the EPYC has 32 cores and 64 threads. This 8x core and 16x thread difference explains the multi-core benchmark gaps.

Cache hierarchies also differ substantially. The i5-6500 has 64 KB of L1 and 256 KB of L2 per core, with 6 MB of shared L3 cache. The EPYC 7551P has 96 KB of L1 and 512 KB of L2 per core, with a much larger 64 MB of shared L3. The EPYC’s larger per-core caches and 10.7x bigger L3 pool give it a significant advantage in workloads with large working sets. Memory support is another major split: both use DDR4, but the i5 runs dual-channel while the EPYC runs eight-channel, yielding 170.6 GB/s versus 34.1 GB/s of bandwidth. The EPYC also supports ECC memory, which the i5 does not, making the EPYC suitable for error-sensitive server environments.

Other architectural differences include the socket and platform. The i5 uses Intel Socket 1151, while the EPYC uses AMD Socket SP3. The i5 has 16 PCIe Gen 3 lanes from the CPU, while the EPYC lists Gen 3 PCIe without a lane count, indicating a server-class expansion capability. The EPYC has an unlocked multiplier, whereas the i5 is locked. The i5 integrates HD Graphics 530; the EPYC has no integrated graphics, requiring a discrete GPU for any display output. The EPYC’s TDP is 180 watts versus the i5’s 65 watts, reflecting its much higher core count and power draw.

Head-to-Head Benchmarks

The Cinebench suite shows a consistent, overwhelming lead for the EPYC 7551P across both multi-core and single-core tests. In Cinebench R15 multi-core, the EPYC scores 3,276 against the i5’s 479, a delta of -85.4% from the i5’s perspective. The same -85.4% delta appears in R20 multi-core (13,650 vs 1,999) and R23 multi-core (32,500 vs 4,760). The EPYC’s advantage is not limited to heavily threaded workloads; it also wins Cinebench single-core tests by the same -85.4% margin in R15 (462 vs 67), R20 (1,926 vs 282), and R23 (4,588 vs 672). This means the EPYC’s per-core performance in rendering is dramatically higher, likely due to its larger caches and higher bandwidth, despite a lower base clock of 2.00 GHz versus the i5’s 3.20 GHz and a boost clock of 3.00 GHz versus 3.60 GHz.

Geekbench results are more nuanced. In multi-core, the EPYC wins with 6,296 versus 3,118, a 50.5% lead. However, in single-core, the i5-6500 wins with 1,099 versus 919, a 19.6% advantage. This single-core victory is the only benchmark where the i5 outperforms the EPYC. The data suggests the i5’s higher clock speeds and Skylake architecture give it an edge in a specific legacy single-thread workload, while the EPYC’s Zen design excels in rendering and multi-threaded tasks. The EPYC also has a higher average benchmark score of 7,952 compared to the i5’s 7,569, and a slightly better percentile rank of 64 versus 63, indicating that across its full benchmark set, the EPYC is the stronger overall performer.

FAQ

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

A: The AMD EPYC 7551P wins all Cinebench multi-core tests by 85.4%. In R23 multi-core, it scores 32,500 versus the i5-6500’s 4,760. Its 32 cores and 64 threads provide a massive parallel throughput advantage.

Q: Does the Intel Core i5-6500 win any benchmark?

A: Yes, the i5-6500 wins Geekbench single-core with a score of 1,099 versus the EPYC’s 919, a 19.6% advantage. This is the only head-to-head test it wins out of eight.

Q: Which processor supports ECC memory?

A: The AMD EPYC 7551P supports ECC memory, while the Intel Core i5-6500 does not. This makes the EPYC more suitable for servers where data integrity is critical.

Q: What is the memory bandwidth difference?

A: The EPYC 7551P has an eight-channel memory bus with 170.6 GB/s of bandwidth, while the i5-6500 has a dual-channel bus with 34.1 GB/s. The EPYC offers exactly 5x the memory bandwidth.

Q: Which processor has integrated graphics?

A: The Intel Core i5-6500 includes HD Graphics 530. The AMD EPYC 7551P has no integrated graphics, so it requires a discrete GPU for display output.

Q: What is the core and thread count difference?

A: The i5-6500 has 4 cores and 4 threads, while the EPYC 7551P has 32 cores and 64 threads. The EPYC has 8 times the cores and 16 times the threads.

The Verdict

The data points to a clear split based on use case. For any server, workstation, or rendering workload that can use many threads, the AMD EPYC 7551P is the definitive choice. Its 32 cores and 64 threads deliver an 85.4% lead in all Cinebench multi-core tests, and its 64 MB of L3 cache and 170.6 GB/s memory bandwidth support large-scale parallel processing. The EPYC also wins single-core Cinebench tests, so even light rendering tasks favor it. Its support for ECC memory and active production status further cement its position for professional environments.

The Intel Core i5-6500 is only preferable in a narrow scenario: a desktop system where the single Geekbench single-core performance is paramount, and where integrated graphics are needed to avoid a discrete GPU. Its 19.6% lead in that one test, combined with a lower 65-watt TDP, makes it a viable option for legacy single-threaded applications or basic desktop use. However, its end-of-life status and 4-core limit mean it cannot compete in any multi-threaded workload. The EPYC 7551P wins 7 of 8 head-to-head benchmarks and has a higher average score, so the data overwhelmingly favors it for serious computing tasks.

Specification Differences

| Specification | Intel Core i5-6500 | AMD EPYC 7551P |

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

| Cores | 4 | 32 |

| Threads | 4 | 64 |

| Base Clock | 3.20 GHz | 2.00 GHz |

| Boost Clock | 3.60 GHz | 3.00 GHz |

| TDP | 65 W | 180 W |

| Socket | Intel Socket 1151 | AMD Socket SP3 |

| Architecture | Skylake | Zen (Naples) |

| Process Node | 14 nm | 14 nm |

| Foundry | Intel | GlobalFoundries |

| Transistors | N/A | 4,800 million |

| Die Size | 177 mm² | 213 mm² |

| L1 Cache | 64 KB (per core) | 96 KB (per core) |

| L2 Cache | 256 KB (per core) | 512 KB (per core) |

| L3 Cache | 6 MB (shared) | 64 MB (shared) |

| Memory Bus | Dual-channel | Eight-channel |

| Memory Bandwidth | 34.1 GB/s | 170.6 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 3, 16 Lanes (CPU only) | Gen 3 |

| Integrated Graphics | HD Graphics 530 | None |

| Market Segment | Desktop | Server/Workstation |

| Production Status | End-of-life | Active |

| Multiplier Unlocked | No | Yes |