EPYC 4124P vs Core i9-9900K

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

The EPYC 4124P uses the AM5 socket (PCIe 4.0), while the Core i9-9900K uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-5200 on the EPYC 4124P versus DDR4-2666 on the Core i9-9900K — 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: 28 (EPYC 4124P) vs 16 (Core i9-9900K) — the EPYC 4124P offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: B650,X670,X870 (EPYC 4124P) and Intel 300 series (Core i9-9900K).

Virtualization: AMD-V, AMD-Vi (EPYC 4124P) / not specified (Core i9-9900K). Both include integrated graphics — Radeon Graphics (EPYC 4124P) and Intel UHD Graphics 630 (Core i9-9900K) — 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.