Core i7-7660U vs Core i5-3330

The Core i7-7660U packs 2 cores / 4 threads, while the Core i5-3330 offers 4 cores / 4 threads — the Core i5-3330 has 2 more cores. Boost clocks reach 4 GHz on the Core i7-7660U versus 3.2 GHz on the Core i5-3330 — a 22.2% clock advantage for the Core i7-7660U (base: 2.5 GHz vs 3 GHz). The Core i7-7660U uses the Kaby Lake (2016−2019) architecture (14 nm), while the Core i5-3330 uses Ivy Bridge (2012−2013) (22 nm). In PassMark, the Core i7-7660U scores 4,059 against the Core i5-3330's 4,100 — a 1% lead for the Core i5-3330. Geekbench 6 single-core — the metric most relevant to gaming — records 1,150 vs 600, a 62.9% lead for the Core i7-7660U that directly translates to higher frame rates. L3 cache: 4 MB on the Core i7-7660U vs 6 MB (total) on the Core i5-3330.

The Core i7-7660U uses the BGA1356 socket (PCIe 3.0), while the Core i5-3330 uses LGA1155 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2133 on the Core i7-7660U versus DDR3-1600 on the Core i5-3330 — 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 i5-3330) — the Core i5-3330 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: SoC (Core i7-7660U) and H61,B75,H77,Z75,Z77 (Core i5-3330).

Neither processor supports overclocking. Virtualization support: VT-x, VT-d (Core i7-7660U) vs VT-x, VT-d, EPT (Core i5-3330). Both include integrated graphics — Iris Plus 640 (Core i7-7660U) and HD Graphics 2500 (Core i5-3330) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i7-7660U targets Productivity, Core i5-3330 targets Legacy Desktop. Direct competitor: Core i7-7660U rivals Core i5-8250U; Core i5-3330 rivals FX-6300.