Core i7-7660U vs Core i7-2720QM

The Core i7-7660U packs 2 cores / 4 threads, while the Core i7-2720QM offers 4 cores / 8 threads — the Core i7-2720QM has 2 more cores. Boost clocks reach 4 GHz on the Core i7-7660U versus 3.3 GHz on the Core i7-2720QM — a 19.2% clock advantage for the Core i7-7660U (base: 2.5 GHz vs 2.2 GHz). The Core i7-7660U uses the Kaby Lake (2016−2019) architecture (14 nm), while the Core i7-2720QM uses Sandy Bridge (2011−2013) (32 nm). In PassMark, the Core i7-7660U scores 4,059 against the Core i7-2720QM's 4,015 — a 1.1% lead for the Core i7-7660U. Geekbench 6 single-core — the metric most relevant to gaming — records 1,150 vs 700, a 48.6% lead for the Core i7-7660U that directly translates to higher frame rates. Multi-core Geekbench: 2,285 vs 2,600 (12.9% advantage for the Core i7-2720QM). L3 cache: 4 MB on the Core i7-7660U vs 6 MB (total) on the Core i7-2720QM.

The Core i7-7660U uses the BGA1356 socket (PCIe 3.0), while the Core i7-2720QM uses PGA988 (PCIe 2.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Core i7-7660U versus DDR3-1600 on the Core i7-2720QM — the Core i7-7660U supports 28.6% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 32 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 12 (Core i7-7660U) vs 16 (Core i7-2720QM) — the Core i7-2720QM offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SoC (Core i7-7660U) and HM65,HM67,QM67 (Core i7-2720QM).

Neither processor supports overclocking. Both support VT-x, VT-d virtualization. Both include integrated graphics — Iris Plus 640 (Core i7-7660U) and Intel HD Graphics 3000 (Core i7-2720QM) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i7-7660U targets Productivity, Core i7-2720QM targets Performance Laptop. Direct competitor: Core i7-7660U rivals Core i5-8250U; Core i7-2720QM rivals AMD A8-3510MX.