Core i9-9900K vs EPYC 4124P

The Core i9-9900K packs 8 cores / 16 threads, while the EPYC 4124P offers 4 cores / 8 threads — the Core i9-9900K has 4 more cores. Boost clocks reach 5 GHz on the Core i9-9900K versus 5.1 GHz on the EPYC 4124P — a 2% clock advantage for the EPYC 4124P (base: 3.6 GHz vs 3.8 GHz). The Core i9-9900K uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the EPYC 4124P uses Raphael (2023−2025) (5 nm). In PassMark, the Core i9-9900K scores 18,109 against the EPYC 4124P's 18,139 — a 0.2% lead for the EPYC 4124P. L3 cache: 16 MB (total) on the Core i9-9900K vs 32 MB (total) on the EPYC 4124P.

The Core i9-9900K uses the LGA1151 socket (PCIe 3.0), while the EPYC 4124P uses AM5 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i9-9900K versus DDR5-5200 on the EPYC 4124P — the EPYC 4124P supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The EPYC 4124P supports up to 192 GB of RAM compared to 128 GB — 40% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i9-9900K) vs 28 (EPYC 4124P) — the EPYC 4124P offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 300 series (Core i9-9900K) and B650,X670,X870 (EPYC 4124P).

Virtualization: not specified (Core i9-9900K) / AMD-V, AMD-Vi (EPYC 4124P). Both include integrated graphics — Intel UHD Graphics 630 (Core i9-9900K) and Radeon Graphics (EPYC 4124P) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: EPYC 4124P targets Entry Server. Direct competitor: EPYC 4124P rivals Core i5-10500T.