Core i5-1240U vs Core i3-12100E

The Core i5-1240U packs 10 cores / 12 threads, while the Core i3-12100E offers 4 cores / 8 threads — the Core i5-1240U has 6 more cores. Boost clocks reach 4.4 GHz on the Core i5-1240U versus 4.2 GHz on the Core i3-12100E — a 4.7% clock advantage for the Core i5-1240U (base: 1.1 GHz vs 3.2 GHz). The Core i5-1240U uses the Alder Lake-U (2022) architecture (Intel 7 nm), while the Core i3-12100E uses Alder Lake-S (2022) (10 nm). In PassMark, the Core i5-1240U scores 13,387 against the Core i3-12100E's 13,535 — a 1.1% lead for the Core i3-12100E. Geekbench 6 single-core — the metric most relevant to gaming — records 1,650 vs 1,594, a 3.5% lead for the Core i5-1240U that directly translates to higher frame rates. Both processors carry 12 MB (total) of L3 cache.

The Core i5-1240U uses the FCBGA1781 socket (PCIe 5.0), while the Core i3-12100E uses LGA1700 (PCIe 5.0) — making them incompatible on the same motherboard. Both support up to LPDDR5-5200 memory speed. The Core i3-12100E 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: 14 (Core i5-1240U) vs 20 (Core i3-12100E) — the Core i3-12100E offers 6 more lanes for additional GPUs or NVMe drives.

Neither processor supports overclocking. Both support VT-x, VT-d, EPT virtualization. Both include integrated graphics — Iris Xe Graphics 80EU (Core i5-1240U) and UHD Graphics 730 (Core i3-12100E) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-1240U targets Thin & Light Laptop, Core i3-12100E targets Embedded. Direct competitor: Core i5-1240U rivals Ryzen 5 5600U; Core i3-12100E rivals Ryzen Embedded V3000 Series.