Core i7-5820K vs Core i7-11390H

The Core i7-5820K packs 6 cores / 12 threads, while the Core i7-11390H offers 4 cores / 8 threads — the Core i7-5820K has 2 more cores. Boost clocks reach 3.6 GHz on the Core i7-5820K versus 5 GHz on the Core i7-11390H — a 32.6% clock advantage for the Core i7-11390H (base: 3.3 GHz vs 2.9 GHz). The Core i7-5820K uses the Haswell-E (2014) architecture (22 nm), while the Core i7-11390H uses Tiger Lake-H35 (2021) (10 nm SuperFin). In PassMark, the Core i7-5820K scores 9,826 against the Core i7-11390H's 9,798 — a 0.3% lead for the Core i7-5820K. Geekbench 6 single-core — the metric most relevant to gaming — records 1,134 vs 1,948, a 52.8% lead for the Core i7-11390H that directly translates to higher frame rates. L3 cache: 15 MB (total) on the Core i7-5820K vs 12 MB (total) on the Core i7-11390H.

The Core i7-5820K uses the LGA2011 socket (PCIe 3.0), while the Core i7-11390H uses FCBGA1449 (PCIe 4.0) — making them incompatible on the same motherboard. Both support up to DDR4-2133 memory speed. Both support up to 64 GB of RAM. Memory channels: 4 (Core i7-5820K) vs 2 (Core i7-11390H). PCIe lanes: 28 (Core i7-5820K) vs 20 (Core i7-11390H) — the Core i7-5820K offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel X99 (Core i7-5820K) and HM570,QC570,WM590 (Core i7-11390H).

Only the Core i7-5820K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Core i7-11390H supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: Yes (Core i7-5820K) vs VT-x, VT-d, EPT (Core i7-11390H). The Core i7-11390H includes integrated graphics (Iris Xe Graphics 96EU), while the Core i7-5820K requires a dedicated GPU. Primary use case: Core i7-5820K targets Enthusiast Workstation, Core i7-11390H targets Thin & Light Gaming Laptop. Direct competitor: Core i7-5820K rivals Ryzen 5 1600; Core i7-11390H rivals Ryzen 7 5800U.