Core i3-12100E vs Core i5-1240U

The Core i3-12100E packs 4 cores / 8 threads, while the Core i5-1240U offers 10 cores / 12 threads — the Core i5-1240U has 6 more cores. Boost clocks reach 4.2 GHz on the Core i3-12100E versus 4.4 GHz on the Core i5-1240U — a 4.7% clock advantage for the Core i5-1240U (base: 3.2 GHz vs 1.1 GHz). The Core i3-12100E uses the Alder Lake-S (2022) architecture (10 nm), while the Core i5-1240U uses Alder Lake-U (2022) (Intel 7 nm). In PassMark, the Core i3-12100E scores 13,535 against the Core i5-1240U's 13,387 — a 1.1% lead for the Core i3-12100E. Geekbench 6 single-core — the metric most relevant to gaming — records 1,594 vs 1,650, 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 i3-12100E uses the LGA1700 socket (PCIe 5.0), while the Core i5-1240U uses FCBGA1781 (PCIe 5.0) — making them incompatible on the same motherboard. Both support up to DDR5-4800 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: 20 (Core i3-12100E) vs 14 (Core i5-1240U) — 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 — UHD Graphics 730 (Core i3-12100E) and Iris Xe Graphics 80EU (Core i5-1240U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i3-12100E targets Embedded, Core i5-1240U targets Thin & Light Laptop. Direct competitor: Core i3-12100E rivals Ryzen Embedded V3000 Series; Core i5-1240U rivals Ryzen 5 5600U.