AMD EPYC 7251 vs Intel Core i7-9700KF Comparison

Head-to-Head Benchmarks

The recorded data shows a clean sweep for the AMD EPYC 7251 across every Cinebench test in the database. This is not a marginal victory; the EPYC 7251 holds a consistent 4.7% lead in four of the six head-to-head tests, with the remaining two tests showing a 4.4% advantage. The Intel Core i7-9700KF never once takes the lead, resulting in a 6-0 win count for the AMD server part.

Starting with multi-core workloads, the EPYC 7251 scores 1279 in Cinebench R15 multi-core versus 1219 for the i7-9700KF, a 4.7% gap. The pattern repeats in Cinebench R20 multi-core, where the EPYC 7251 posts 5331 against 5082, and in Cinebench R23 multi-core, where the scores are 12694 and 12100 respectively. The delta remains locked at 4.7% across all three multi-core tests, which suggests the advantage is structural rather than workload-specific. The EPYC 7251's 16 threads are doing meaningful work here; the i7-9700KF, with only 8 threads, cannot offset the EPYC's simultaneous multithreading advantage despite its much higher clock speeds.

The single-core results tell a similar story, though the margin is slightly narrower in one instance. In Cinebench R15 single-core, the EPYC 7251 scores 180 against 172 for the i7-9700KF, a 4.4% lead. In Cinebench R20 single-core, the scores are 752 versus 717, and in Cinebench R23 single-core, 1792 versus 1708. Both of these latter tests show the same 4.7% gap. This is notable because the i7-9700KF has a significantly higher boost clock of 4.90 GHz compared to the EPYC 7251's 2.90 GHz. The data indicates that the EPYC's Zen architecture extracts more instructions per clock in these tests, enough to overcome the clock speed deficit and still win single-threaded workloads.

The broader benchmark picture reinforces this. The i7-9700KF's average benchmark score across all recorded tests is 3787, placing it in the 56th percentile of all CPUs. The EPYC 7251's average is 3671, also in the 56th percentile. These are nearly identical average scores, yet the head-to-head Cinebench results all favor the EPYC 7251. The i7-9700KF does have Geekbench results in the database: 7620 multi-core and 1681 single-core, while the EPYC 7251 has no Geekbench entries. For the tests where both parts have data, the EPYC 7251 wins every single one.

Context from the nearest rivals helps calibrate these scores. The i7-9700KF sits within 0.3% of the AMD Ryzen 7 PRO 2700 (3777) and the Intel Core i5-1245U (3775), and within 0.3% of the Intel Core i7-8086K (3800). It trails the AMD Ryzen 9 4900H (3820) by 0.9%. The EPYC 7251 is effectively tied with the AMD Ryzen 7 PRO 1700X (3673, 0.1% difference) and the Intel Core i3-13100E (3668). It leads the Intel Xeon E5-2658A v3 (3658) by 0.4% and trails the AMD EPYC 7301 (3685) by 0.4%. Neither part is a standout in the broader database, but in this direct comparison, the EPYC 7251 is consistently ahead.

Architecture Differences

The two processors come from fundamentally different design philosophies. The Intel Core i7-9700KF is a desktop part built on the Coffee Lake architecture, using a 14 nm process node manufactured by Intel itself. The die size is 180.3 mm². It has 8 cores and 8 threads, meaning no simultaneous multithreading. Each core gets 64 KB of L1 cache and 256 KB of L2 cache, with a shared 12 MB L3 cache. The base clock is 3.60 GHz, and the boost clock reaches 4.90 GHz. The thermal design power is 95 watts. Memory support is DDR4 on a dual-channel bus, delivering 42.7 GB/s of bandwidth. ECC memory is not supported. The PCIe implementation is Gen 3 with 16 lanes from the CPU. The multiplier is unlocked, and it fits the Intel Socket 1151.

The AMD EPYC 7251 is a server and workstation part from the EPYC 7001 series, built on the Zen architecture with the codename Naples. It also uses a 14 nm process node, but the foundry is GlobalFoundries, not AMD. The die size is 213 mm², and the transistor count is 4,800 million. It has 8 cores but 16 threads, so simultaneous multithreading is enabled. Each core has 96 KB of L1 cache and 512 KB of L2 cache, with a much larger shared 32 MB L3 cache. The base clock is 2.10 GHz, and the boost clock is 2.90 GHz. The thermal design power is 120 watts. Memory support is DDR4 on an eight-channel bus, delivering 153.6 GB/s of bandwidth. ECC memory is supported. The PCIe implementation is Gen 3, though the database does not specify lane count for this part. The multiplier is unlocked, and it uses the AMD Socket SP3.

These are stark contrasts. The i7-9700KF emphasizes raw clock speed: its 4.90 GHz boost is 2.0 GHz higher than the EPYC's 2.90 GHz boost. The EPYC 7251 counters with double the threads, roughly 2.7 times the L3 cache (32 MB versus 12 MB), and 3.6 times the memory bandwidth (153.6 GB/s versus 42.7 GB/s) thanks to its eight-channel memory controller. The EPYC also supports ECC memory, which the Intel part does not. The Intel part has a smaller die and lower TDP, while the EPYC uses more transistors across a larger die. The release dates differ substantially: the i7-9700KF launched in January 2019, while the EPYC 7251 launched in June 2017. The Intel part is marked as end-of-life, while the EPYC 7251 remains active in production.

The architectural intent is clear. The i7-9700KF is built for low-latency, high-frequency desktop workloads where single-thread speed matters most. The EPYC 7251 is built for throughput in multi-threaded server environments, with massive memory bandwidth and ECC support for reliability. The benchmark data, however, shows that the EPYC 7251 wins even in single-threaded Cinebench tests, which suggests the Zen core's efficiency per clock is substantially better than Coffee Lake's in these specific workloads.

The Verdict

The data points to one conclusion: the AMD EPYC 7251 is the faster processor in every benchmark where both parts have recorded scores. It wins all six Cinebench tests, with margins between 4.4% and 4.7%. The i7-9700KF never wins a single head-to-head test in the database.

Who should pick the Intel Core i7-9700KF? Anyone who needs the desktop platform features it offers: Socket 1151 compatibility, a 95 watt TDP, and a 4.90 GHz boost clock that is the highest in this comparison. The unlocked multiplier and 16 PCIe Gen 3 lanes from the CPU make it a flexible part for a desktop build. Its Geekbench scores of 7620 multi-core and 1681 single-core are the only benchmark entries the EPYC 7251 lacks, so if Geekbench is the relevant metric, the Intel part has data and the EPYC does not. The launch MSRP was $374.

Who should pick the AMD EPYC 7251? Anyone who prioritizes raw compute performance in Cinebench workloads, which are representative of rendering and multi-threaded content creation. The EPYC 7251 wins every Cinebench test, has double the threads, nearly three times the L3 cache, and over three times the memory bandwidth. It also supports ECC memory, which matters for long-running, data-sensitive workloads. The 120 watt TDP and SP3 socket mean it requires a server or workstation platform, not a desktop board.

The percentile ranking is identical at 56 for both parts, and the average benchmark scores are close (3787 versus 3671). But in direct competition, there is no ambiguity. The EPYC 7251 is the faster chip in the tests that matter for this comparison.

FAQ

Q: Which processor wins in multi-core Cinebench tests?

A: The AMD EPYC 7251 wins all three multi-core tests. It scores 1279 in R15, 5331 in R20, and 12694 in R23, versus 1219, 5082, and 12100 for the Intel Core i7-9700KF.

Q: Does the Intel Core i7-9700KF win any single-core tests?

A: No. The EPYC 7251 wins all three single-core tests: 180 versus 172 in R15, 752 versus 717 in R20, and 1792 versus 1708 in R23.

Q: Why does the EPYC 7251 win despite having much lower clock speeds?

A: The EPYC 7251 has a 2.10 GHz base and 2.90 GHz boost, while the i7-9700KF has a 3.60 GHz base and 4.90 GHz boost. The benchmark results indicate that the Zen architecture's instructions per clock are higher in these specific tests, overcoming the clock deficit.

Q: Which processor supports ECC memory?

A: The AMD EPYC 7251 supports ECC memory. The Intel Core i7-9700KF does not.

Q: How do the memory bandwidth figures compare?

A: The EPYC 7251 delivers 153.6 GB/s over an eight-channel DDR4 bus. The i7-9700KF delivers 42.7 GB/s over a dual-channel DDR4 bus.

Q: Are both processors still in production?

A: No. The Intel Core i7-9700KF is marked as end-of-life, while the AMD EPYC 7251 is listed as active in production.

Where Each One Wins

The AMD EPYC 7251 wins in every category where direct benchmark data exists. It takes all six Cinebench tests, covering both multi-core and single-core workloads from R15 through R23. Its advantages extend to architectural features: 16 threads versus 8, 32 MB L3 cache versus 12 MB, 153.6 GB/s memory bandwidth versus 42.7 GB/s, eight-channel memory support versus dual-channel, and ECC memory support. The EPYC also has a larger die at 213 mm² and more transistors at 4,800 million.

The Intel Core i7-9700KF wins in clock speed and efficiency metrics. It has a 4.90 GHz boost clock, far above the EPYC's 2.90 GHz. It has a lower TDP at 95 watts versus 120 watts. It has a smaller die at 180.3 mm² versus 213 mm². It uses a desktop socket (Intel Socket 1151) rather than a server socket (AMD Socket SP3), which means it fits in conventional desktop motherboards. It also has Geekbench scores in the database (7620 multi-core, 1681 single-core) that the EPYC 7251 does not have, so for Geekbench-based comparisons, the i7-9700KF is the only one of the two with recorded results.

The Intel part also has a clear release date advantage in terms of newer silicon: January 2019 versus June 2017. But the benchmark data does not reward that recency. The EPYC 7251, despite being older, is faster in every measured test.

Specification Differences

| Specification | Intel Core i7-9700KF | AMD EPYC 7251 |

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

| Cores | 8 | 8 |

| Threads | 8 | 16 |

| Base Clock | 3.60 GHz | 2.10 GHz |

| Boost Clock | 4.90 GHz | 2.90 GHz |

| TDP | 95 W | 120 W |

| Socket | Intel Socket 1151 | AMD Socket SP3 |

| Architecture | Coffee Lake | Zen (Naples) |

| Process Node | 14 nm | 14 nm |

| Foundry | Intel | GlobalFoundries |

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

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

| L3 Cache | 12 MB shared | 32 MB shared |

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

| Memory Bandwidth | 42.7 GB/s | 153.6 GB/s |

| ECC Memory | No | Yes |

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

| Market Segment | Desktop | Server/Workstation |

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

| Release Date | 2019-01-07 | 2017-06-28 |

| Multiplier Unlocked | Yes | Yes |