Core i7-5820K vs Core i7-1165G7

The Core i7-5820K packs 6 cores / 12 threads, while the Core i7-1165G7 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 4.7 GHz on the Core i7-1165G7 — a 26.5% clock advantage for the Core i7-1165G7 (base: 3.3 GHz vs 2.8 GHz). The Core i7-5820K uses the Haswell-E (2014) architecture (22 nm), while the Core i7-1165G7 uses Tiger Lake-UP3 (2020−2021) (10 nm SuperFin). In PassMark, the Core i7-5820K scores 9,826 against the Core i7-1165G7's 9,863 — a 0.4% lead for the Core i7-1165G7. Geekbench 6 single-core — the metric most relevant to gaming — records 1,134 vs 1,809, a 45.9% lead for the Core i7-1165G7 that directly translates to higher frame rates. L3 cache: 15 MB (total) on the Core i7-5820K vs 12 MB (total) on the Core i7-1165G7.

The Core i7-5820K uses the LGA2011 socket (PCIe 3.0), while the Core i7-1165G7 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 i7-1165G7). PCIe lanes: 28 (Core i7-5820K) vs 4 (Core i7-1165G7) — the Core i7-5820K offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel X99 (Core i7-5820K) and Tiger Lake-UP3 (Core i7-1165G7).

Only the Core i7-5820K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Only the Core i7-1165G7 supports AVX-512 instructions — important for machine learning and scientific applications. Virtualization support: Yes (Core i7-5820K) vs VT-x, VT-d, EPT (Core i7-1165G7). The Core i7-1165G7 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 i7-1165G7 targets Mainstream Ultrabook. Direct competitor: Core i7-5820K rivals Ryzen 5 1600; Core i7-1165G7 rivals Ryzen 7 5700U.