Core i7-8700K vs Core i7-1260U

The Core i7-8700K packs 6 cores / 12 threads, while the Core i7-1260U offers 10 cores / 12 threads — the Core i7-1260U has 4 more cores. Boost clocks reach 4.7 GHz on the Core i7-8700K versus 4.7 GHz on the Core i7-1260U — identical boost frequencies (base: 3.7 GHz vs 1.1 GHz). The Core i7-8700K uses the Coffee Lake-S (2017−2018) architecture (14 nm), while the Core i7-1260U uses Alder Lake-U (2022) (Intel 7 nm). In PassMark, the Core i7-8700K scores 13,572 against the Core i7-1260U's 13,614 — a 0.3% lead for the Core i7-1260U. L3 cache: 12288 kB on the Core i7-8700K vs 12 MB (total) on the Core i7-1260U.

The Core i7-8700K uses the LGA1151 socket (PCIe 3.0), while the Core i7-1260U uses FCBGA1781 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i7-8700K versus DDR5-4800 on the Core i7-1260U — the Core i7-1260U supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-8700K supports up to 128 GB of RAM compared to 64 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i7-8700K) vs 14 (Core i7-1260U) — the Core i7-8700K offers 2 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 300 series (Core i7-8700K) and SoC (Core i7-1260U).

Virtualization: not specified (Core i7-8700K) / VT-x, VT-d, EPT (Core i7-1260U). Both include integrated graphics — Intel UHD Graphics 630 (Core i7-8700K) and Iris Xe Graphics (96 EU) (Core i7-1260U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i7-1260U targets Productivity. Direct competitor: Core i7-1260U rivals Core i7-1165G7.