Core i5-11400 vs Core Ultra 5 135U

The Core i5-11400 packs 6 cores / 12 threads, while the Core Ultra 5 135U offers 12 cores / 14 threads — the Core Ultra 5 135U has 6 more cores. Boost clocks reach 4.4 GHz on the Core i5-11400 versus 4.4 GHz on the Core Ultra 5 135U — identical boost frequencies (base: 2.6 GHz vs 1.6 GHz). The Core i5-11400 uses the Rocket Lake (2021) architecture (14 nm), while the Core Ultra 5 135U uses Meteor Lake-P (2023) (7 nm). In PassMark, the Core i5-11400 scores 16,670 against the Core Ultra 5 135U's 16,900 — a 1.4% lead for the Core Ultra 5 135U. Cinebench R23 multi-core: 10,350 vs 9,315 (10.5% advantage for the Core i5-11400). Geekbench 6 single-core — the metric most relevant to gaming — records 1,960 vs 1,948, a 0.6% lead for the Core i5-11400 that directly translates to higher frame rates. Multi-core Geekbench: 7,260 vs 8,000 (9.7% advantage for the Core Ultra 5 135U). Both processors carry 12 MB (total) of L3 cache.

The Core i5-11400 uses the LGA1200 socket (PCIe 4.0), while the Core Ultra 5 135U uses FCBGA2049 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Core i5-11400 versus DDR5-5600 on the Core Ultra 5 135U — the Core Ultra 5 135U supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-11400 supports up to 128 GB of RAM compared to 96 GB — 28.6% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 20 PCIe lanes. Chipset compatibility: B560,Z590 (Core i5-11400) and SoC (Core Ultra 5 135U).

Only the Core i5-11400 supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: VT-x, VT-d (Core i5-11400) vs Yes (Core Ultra 5 135U). Both include integrated graphics — Intel UHD Graphics 730 (Core i5-11400) and Intel Arc Graphics (Core Ultra 5 135U) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-11400 targets Mainstream Desktop. Direct competitor: Core i5-11400 rivals Ryzen 5 5600X.