Core i5-11400T vs Core i7-1255U

The Core i5-11400T packs 6 cores / 12 threads, while the Core i7-1255U offers 10 cores / 12 threads — the Core i7-1255U has 4 more cores. Boost clocks reach 3.7 GHz on the Core i5-11400T versus 4.7 GHz on the Core i7-1255U — a 23.8% clock advantage for the Core i7-1255U (base: 1.3 GHz vs 1.7 GHz). The Core i5-11400T uses the Rocket Lake (2021) architecture (14 nm), while the Core i7-1255U uses Alder Lake-U (2022) (Intel 7 nm). In PassMark, the Core i5-11400T scores 13,034 against the Core i7-1255U's 13,128 — a 0.7% lead for the Core i7-1255U. Geekbench 6 single-core — the metric most relevant to gaming — records 1,767 vs 1,809, a 2.3% lead for the Core i7-1255U that directly translates to higher frame rates. Both processors carry 12 MB (total) of L3 cache.

The Core i5-11400T uses the LGA1200 socket (PCIe 4.0), while the Core i7-1255U uses FCBGA1744 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Core i5-11400T versus DDR5-4800 on the Core i7-1255U — the Core i7-1255U supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-11400T 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. Both provide 20 PCIe lanes. Chipset compatibility: H510,B560,Z590,H470,Z490 (Core i5-11400T) and Alder Lake-U (Core i7-1255U).

Neither processor supports overclocking. Only the Core i5-11400T supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d, EPT virtualization. Both include integrated graphics — UHD 730 (Core i5-11400T) and Iris Xe Graphics 96EU (Core i7-1255U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-11400T targets Productivity, Core i7-1255U targets Mainstream Laptop. Direct competitor: Core i5-11400T rivals Core i5-11400; Core i7-1255U rivals Ryzen 7 6800U.