AMD EPYC 7252 vs Intel Core i9-9900KS Comparison

The AMD EPYC 7252 and Intel Core i9-9900KS are an unusual pairing: one is a server processor designed for datacenter reliability, the other a special-edition desktop part engineered for maximum clock speed. Benchmark results show they are remarkably close in raw compute, with the EPYC 7252 winning every head-to-head Cinebench test by a margin of 0.3% to 0.4%. However, their architectures could not be more different, and that dictates which one belongs in which machine. The data shows a 59th percentile standing for both, making them statistical equals in overall CPU performance, but the EPYC 7252's eight-channel memory and 128 PCIe Gen 4 lanes make it the clear choice for server workloads, while the i9-9900KS's unlocked multiplier and 5.00 GHz boost clock serve desktop enthusiasts.

The Verdict

The benchmark results indicate a near-perfect performance tie. Across six Cinebench tests, the AMD EPYC 7252 wins all of them, but by margins of just 0.3% to 0.4%. In Cinebench R23 multi-core, the EPYC scores 16499 against the i9-9900KS's 16446, a gap of only 53 points. In single-core R23, it is 2329 versus 2321. These differences are within run-to-run noise, so the decision must come down to platform features rather than raw speed.

The EPYC 7252 is the pick for anyone building or populating a server/workstation. Its 128 PCIe Gen 4 lanes and eight-channel DDR4 memory with 85.3 GB/s bandwidth are the defining features. The Intel part offers only 16 PCIe Gen 3 lanes and dual-channel memory at 42.7 GB/s. If you need to attach multiple GPUs, NVMe storage arrays, or high-bandwidth network cards, the EPYC is the only rational choice. It also supports ECC memory, which is a non-negotiable feature for data integrity in a server environment.

The i9-9900KS is the choice for a desktop gaming or content-creation rig where single-thread responsiveness and overclocking matter more than expandability. It has a 5.00 GHz boost clock and an unlocked multiplier, allowing the user to push it further. It also includes integrated UHD 630 graphics, which the EPYC lacks. Its 127W TDP is only slightly higher than the EPYC's 120W, but its dual-channel memory limitation and end-of-life production status make it a less future-proof investment. The EPYC 7252 remains active in production, while the i9-9900KS is end-of-life.

Architecture Differences

The EPYC 7252 is built on TSMC's 7 nm process with 7,600 million transistors across two 74 mm² dies. It uses AMD's Zen 2 architecture, codenamed Rome. The i9-9900KS uses Intel's 14 nm process with an 180 mm² die and the Coffee Lake architecture, codenamed Coffee Lake-R. The process node difference is enormous: 7 nm versus 14 nm, which explains how the EPYC achieves comparable performance at a lower TDP of 120W versus 127W despite running at significantly lower clocks.

The cache layouts also diverge. The EPYC 7252 has 64 KB of L1 and 512 KB of L2 per core, with 32 MB of L3 per die and 64 MB total L3. The i9-9900KS has the same 64 KB L1 per core but only 256 KB of L2 per core, and a shared 16 MB L3. The EPYC's 64 MB L3 is four times larger, which helps in server workloads with large working sets. The i9 compensates with a base clock of 4.00 GHz and a 5.00 GHz boost, versus the EPYC's 3.10 GHz base and 3.20 GHz boost.

Memory and I/O are the biggest differentiators. The EPYC supports eight-channel DDR4 with 85.3 GB/s bandwidth and ECC. The i9-9900KS is dual-channel with 42.7 GB/s and no ECC. The EPYC provides 128 PCIe Gen 4 lanes from the CPU; the i9 provides 16 PCIe Gen 3 lanes. The EPYC also has a larger physical footprint with the AMD Socket SP3 versus Intel Socket 1151.

FAQ

Q: Which CPU is faster in multi-core Cinebench R23?

A: The AMD EPYC 7252 scores 16499, edging out the Intel Core i9-9900KS's 16446 by 0.3%.

Q: Does the Intel Core i9-9900KS have integrated graphics?

A: Yes, it includes Intel UHD 630 graphics. The AMD EPYC 7252 has no integrated graphics, so a discrete GPU is mandatory.

Q: Which CPU supports ECC memory?

A: Only the AMD EPYC 7252 supports ECC memory. The Intel Core i9-9900KS does not support ECC.

Q: How much memory bandwidth does each CPU provide?

A: The EPYC 7252 provides 85.3 GB/s via eight-channel DDR4, while the i9-9900KS provides 42.7 GB/s via dual-channel DDR4.

Q: Which CPU has more PCIe lanes?

A: The EPYC 7252 has 128 PCIe Gen 4 lanes from the CPU. The i9-9900KS has 16 PCIe Gen 3 lanes.

Q: Is the Intel Core i9-9900KS overclockable?

A: Yes, it has an unlocked multiplier. The AMD EPYC 7252 has a locked multiplier.

Specification Differences

| Specification | AMD EPYC 7252 | Intel Core i9-9900KS |

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

| Cores | 8 | 8 |

| Threads | 16 | 16 |

| Base Clock | 3.10 GHz | 4.00 GHz |

| Boost Clock | 3.20 GHz | 5.00 GHz |

| TDP | 120W | 127W |

| Socket | AMD Socket SP3 | Intel Socket 1151 |

| Process Node | 7 nm | 14 nm |

| Die Size | 2x 74 mm² | 180 mm² |

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

| L3 Cache | 32 MB (per die), 64 MB total | 16 MB (shared) |

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

| Memory Bandwidth | 85.3 GB/s | 42.7 GB/s |

| ECC Memory | Yes | No |

| PCIe | Gen 4, 128 Lanes | Gen 3, 16 Lanes |

| Integrated Graphics | None | UHD 630 |

| Multiplier Unlocked | No | Yes |

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

Head-to-Head Benchmarks

The six Cinebench comparisons show an extremely consistent pattern. In Cinebench R15 multi-core, the EPYC 7252 scores 1662 against 1657 for the i9-9900KS, a 0.3% win. In R15 single-core, it is 234 versus 233, a 0.4% win. Moving to R20, the multi-core result is 6929 versus 6907 (0.3% win), and single-core is 978 versus 974 (0.4% win). In R23, the multi-core score is 16499 versus 16446 (0.3% win), and single-core is 2329 versus 2321 (0.3% win).

These numbers tell a clear story: the two CPUs are effectively identical in CPU-bound rendering workloads. The EPYC's higher L3 cache and newer architecture offset the Intel part's massive 1.8 GHz boost clock advantage. The i9's 5.00 GHz boost does not translate into a single-core victory because the EPYC's Zen 2 architecture delivers more instructions per clock. The largest delta is 0.4% in single-core tests, which is negligible. Neither part has a meaningful edge in these benchmarks.

Data outside the head-to-head section shows the i9-9900KS has additional benchmark results. In Geekbench, it scores 9771 multi-core and 1715 single-core. In 3DMark, it scores 7376 with 16 threads, 1670 with 2 threads, 3276 with 4 threads, 5787 with 8 threads, 7360 with max threads, and 841 single-thread. These are not available for the EPYC 7252, so direct comparison is not possible, but they show the i9 is a competent performer in threaded and lightly threaded workloads.

Where Each One Wins

The AMD EPYC 7252 wins in every scenario where platform expansion is the priority. Its 128 PCIe Gen 4 lanes allow for a massive number of high-speed devices, far beyond what the i9's 16 Gen 3 lanes can handle. The eight-channel memory controller provides 85.3 GB/s of bandwidth, which is double the i9's 42.7 GB/s. For virtualization hosts, database servers, or workstations handling large datasets, the EPYC's 64 MB L3 cache and ECC memory support are decisive advantages. The data shows it is also the production-ready part, remaining active while the i9 is end-of-life.

The Intel Core i9-9900KS wins on clock speed and overclocking. Its 5.00 GHz boost clock is the highest in this comparison, and the unlocked multiplier allows users to push it higher. The integrated UHD 630 graphics provide a fallback display output without a discrete GPU. Its lower memory bandwidth and lane count are acceptable for a desktop gaming machine, where the EPYC's server features are wasted. The Geekbench scores of 9771 multi-core and 1715 single-core demonstrate solid desktop performance, and the 3DMark results, particularly the 841 single-thread score, suggest strong gaming-relevant performance.

In summary, the benchmark data shows a tie in compute, but a clear divergence in use case. The EPYC 7252 is for servers and workstations that need memory bandwidth, ECC, and PCIe expansion. The i9-9900KS is for desktop users who want high clocks and overclocking headroom. The average benchmark scores reflect this: the EPYC 7252 averages 4772 across its tests, while the i9-9900KS averages 4738, a 0.7% difference that favors the EPYC but is not meaningful in practice. Choose based on the platform, not the CPU scores.