Core i7-875K vs Core i5-6260U

The Core i7-875K packs 4 cores / 8 threads, while the Core i5-6260U offers 2 cores / 4 threads — the Core i7-875K has 2 more cores. Boost clocks reach 3.6 GHz on the Core i7-875K versus 2.9 GHz on the Core i5-6260U — a 21.5% clock advantage for the Core i7-875K (base: 2.93 GHz vs 1.8 GHz). The Core i7-875K uses the Lynnfield (2009−2010) architecture (45 nm), while the Core i5-6260U uses Skylake (2015−2016) (14 nm). In PassMark, the Core i7-875K scores 3,177 against the Core i5-6260U's 3,200 — a 0.7% lead for the Core i5-6260U. L3 cache: 8 MB (total) on the Core i7-875K vs 4 MB on the Core i5-6260U.

The Core i7-875K uses the LGA1156 socket (PCIe 2.0), while the Core i5-6260U uses BGA1356 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 on the Core i7-875K versus DDR4-2133 on the Core i5-6260U — the Core i5-6260U supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-6260U supports up to 32 GB of RAM compared to 16 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i7-875K) vs 12 (Core i5-6260U) — the Core i7-875K offers 4 more lanes for additional GPUs or NVMe drives.

Only the Core i7-875K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x (Core i7-875K) vs VT-x, VT-d, EPT (Core i5-6260U). The Core i5-6260U includes integrated graphics (Iris Graphics 540), while the Core i7-875K requires a dedicated GPU. Primary use case: Core i7-875K targets Desktop, Core i5-6260U targets Mainstream Laptop. Direct competitor: Core i5-6260U rivals A12-9720P.