Core i5-1245U vs Core i7-8700

The Core i5-1245U packs 10 cores / 12 threads, while the Core i7-8700 offers 6 cores / 12 threads — the Core i5-1245U has 4 more cores. Boost clocks reach 4.4 GHz on the Core i5-1245U versus 4.6 GHz on the Core i7-8700 — a 4.4% clock advantage for the Core i7-8700 (base: 1.6 GHz vs 3.2 GHz). The Core i5-1245U uses the Alder Lake-U (2022) architecture (Intel 7 nm), while the Core i7-8700 uses Coffee Lake-S (2017−2018) (14 nm). In PassMark, the Core i5-1245U scores 12,964 against the Core i7-8700's 12,747 — a 1.7% lead for the Core i5-1245U. Geekbench 6 single-core — the metric most relevant to gaming — records 2,150 vs 1,535, a 33.4% lead for the Core i5-1245U that directly translates to higher frame rates. L3 cache: 12 MB (total) on the Core i5-1245U vs 12288 kB on the Core i7-8700.

The Core i5-1245U uses the FCBGA1744 socket (PCIe 5.0), while the Core i7-8700 uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches LPDDR5-5200 on the Core i5-1245U versus DDR4-2666 on the Core i7-8700 — the Core i5-1245U supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-8700 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: 20 (Core i5-1245U) vs 16 (Core i7-8700) — the Core i5-1245U offers 4 more lanes for additional GPUs or NVMe drives.

Neither processor supports overclocking. Virtualization support: VT-x, VT-d, EPT (Core i5-1245U) vs VT-x, VT-d (Core i7-8700). Both include integrated graphics — Iris Xe Graphics 80EU (Core i5-1245U) and UHD Graphics 630 (Core i7-8700) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-1245U targets Business Laptop, Core i7-8700 targets Gaming. Direct competitor: Core i5-1245U rivals Ryzen 5 PRO 6650U; Core i7-8700 rivals Ryzen 5 2600.