Core i5-5257U vs Core i7-5500U

Both the Core i5-5257U and Core i7-5500U share an identical 2-core/4-thread configuration. Boost clocks reach 3.1 GHz on the Core i5-5257U versus 3 GHz on the Core i7-5500U — a 3.3% clock advantage for the Core i5-5257U (base: 2.7 GHz vs 2.4 GHz). Both are built on the Broadwell-U (2015) architecture using a 14 nm process. In PassMark, the Core i5-5257U scores 2,837 against the Core i7-5500U's 2,807 — a 1.1% lead for the Core i5-5257U. Geekbench 6 single-core — the metric most relevant to gaming — records 950 vs 956, a 0.6% lead for the Core i7-5500U that directly translates to higher frame rates. Multi-core Geekbench: 1,900 vs 1,933 (1.7% advantage for the Core i7-5500U). L3 cache: 3 MB (total) on the Core i5-5257U vs 4 MB (total) on the Core i7-5500U.

Both processors use the FCBGA1168 socket with PCIe 3.0. Maximum memory speed reaches LPDDR3 1866 MHz on the Core i5-5257U versus DDR3L-1600 / LPDDR3-1600 on the Core i7-5500U — the Core i5-5257U supports 200% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 16 GB of RAM. Both feature 2-channel memory with ECC support. Both provide 12 PCIe lanes. Chipset compatibility: Broadwell-U (Core i5-5257U) and Broadwell-U SoC (Core i7-5500U).

Neither processor supports overclocking. Virtualization support: true (Core i5-5257U) vs VT-x / VT-d / EPT (Core i7-5500U). Both include integrated graphics — Intel Iris Graphics 6100 (Core i5-5257U) and Intel HD Graphics 5500 (Core i7-5500U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-5257U targets Mobile, Core i7-5500U targets Ultrabook.