Core i9-10940X vs Xeon E-2478

The Core i9-10940X packs 14 cores / 28 threads, while the Xeon E-2478 offers 8 cores / 16 threads — the Core i9-10940X has 6 more cores. Boost clocks reach 4.8 GHz on the Core i9-10940X versus 5.2 GHz on the Xeon E-2478 — a 8% clock advantage for the Xeon E-2478 (base: 3.3 GHz vs 2.8 GHz). The Core i9-10940X uses the Cascade Lake-X (2019) architecture (14 nm), while the Xeon E-2478 uses Raptor Lake-S (2023−2024) (Intel 7 nm). In PassMark, the Core i9-10940X scores 27,684 against the Xeon E-2478's 27,776 — a 0.3% lead for the Xeon E-2478. L3 cache: 19.25 MB (total) on the Core i9-10940X vs 24 MB (total) on the Xeon E-2478.

The Core i9-10940X uses the LGA2066 socket (PCIe 3.0), while the Xeon E-2478 uses LGA1700 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2933 on the Core i9-10940X versus DDR5-4800 on the Xeon E-2478 — the Xeon E-2478 supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i9-10940X supports up to 256 GB of RAM compared to 128 GB — 66.7% more capacity for professional workloads. Memory channels: 4 (Core i9-10940X) vs 2 (Xeon E-2478). PCIe lanes: 48 (Core i9-10940X) vs 20 (Xeon E-2478) — the Core i9-10940X offers 28 more lanes for additional GPUs or NVMe drives.

Only the Core i9-10940X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Core i9-10940X supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d virtualization. Primary use case: Core i9-10940X targets High-End Desktop, Xeon E-2478 targets Server.

The Core i9-10940X launched at $784 MSRP, while the Xeon E-2478 debuted at $568. At current prices ($460 vs $269), the Xeon E-2478 is $191 cheaper. In terms of value (PassMark points per dollar), the Core i9-10940X delivers 60.2 pts/$ vs 103.3 pts/$ for the Xeon E-2478 — making the Xeon E-2478 the 52.7% better value option.