Core i5-6260U vs Core i7-870

The Core i5-6260U packs 2 cores / 4 threads, while the Core i7-870 offers 4 cores / 8 threads — the Core i7-870 has 2 more cores. Boost clocks reach 2.9 GHz on the Core i5-6260U versus 3.6 GHz on the Core i7-870 — a 21.5% clock advantage for the Core i7-870 (base: 1.8 GHz vs 2.93 GHz). The Core i5-6260U uses the Skylake (2015−2016) architecture (14 nm), while the Core i7-870 uses Lynnfield (2009−2010) (45 nm). In PassMark, the Core i5-6260U scores 3,200 against the Core i7-870's 3,164 — a 1.1% lead for the Core i5-6260U. Geekbench 6 single-core — the metric most relevant to gaming — records 979 vs 476, a 69.1% lead for the Core i5-6260U that directly translates to higher frame rates. L3 cache: 4 MB on the Core i5-6260U vs 8 MB (total) on the Core i7-870.

The Core i5-6260U uses the BGA1356 socket (PCIe 3.0), while the Core i7-870 uses LGA1156 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Core i5-6260U versus DDR3-1333 on the Core i7-870 — 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: 12 (Core i5-6260U) vs 16 (Core i7-870) — the Core i7-870 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Skylake-U (Core i5-6260U) and P55,H55,H57,Q57 (Core i7-870).

Neither processor supports overclocking. Virtualization support: VT-x, VT-d, EPT (Core i5-6260U) vs VT-x, VT-d (Core i7-870). The Core i5-6260U includes integrated graphics (Iris Graphics 540), while the Core i7-870 requires a dedicated GPU. Primary use case: Core i5-6260U targets Mainstream Laptop, Core i7-870 targets Legacy Desktop. Direct competitor: Core i5-6260U rivals A12-9720P.