Core i7-6700K vs Xeon E5-2670

The Core i7-6700K packs 4 cores / 8 threads, while the Xeon E5-2670 offers 8 cores / 16 threads — the Xeon E5-2670 has 4 more cores. Boost clocks reach 4.2 GHz on the Core i7-6700K versus 3.3 GHz on the Xeon E5-2670 — a 24% clock advantage for the Core i7-6700K (base: 4 GHz vs 2.6 GHz). The Core i7-6700K uses the Skylake (2015−2016) architecture (14 nm), while the Xeon E5-2670 uses Sandy Bridge-EP (2012) (32 nm). In PassMark, the Core i7-6700K scores 8,933 against the Xeon E5-2670's 8,901 — a 0.4% lead for the Core i7-6700K. L3 cache: 8 MB (total) on the Core i7-6700K vs 20480 kB (total) on the Xeon E5-2670.

The Core i7-6700K uses the LGA1151 socket (PCIe 3.0), while the Xeon E5-2670 uses LGA2011 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Core i7-6700K versus DDR3-1600 on the Xeon E5-2670 — the Core i7-6700K supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Xeon E5-2670 supports up to 384 GB of RAM compared to 64 GB — 142.9% more capacity for professional workloads. Memory channels: 2 (Core i7-6700K) vs 4 (Xeon E5-2670). PCIe lanes: 16 (Core i7-6700K) vs 40 (Xeon E5-2670) — the Xeon E5-2670 offers 24 more lanes for additional GPUs or NVMe drives.

Only the Core i7-6700K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support VT-x, VT-d virtualization. The Core i7-6700K includes integrated graphics (HD Graphics 530), while the Xeon E5-2670 requires a dedicated GPU. Primary use case: Core i7-6700K targets Desktop, Xeon E5-2670 targets Server.

The Core i7-6700K launched at $350 MSRP, while the Xeon E5-2670 debuted at $1552. At current prices ($142 vs $60), the Xeon E5-2670 is $82 cheaper. In terms of value (PassMark points per dollar), the Core i7-6700K delivers 62.9 pts/$ vs 148.3 pts/$ for the Xeon E5-2670 — making the Xeon E5-2670 the 80.9% better value option.