Core i7-12700K vs Core i7-3820QM

The Core i7-12700K packs 12 cores / 20 threads, while the Core i7-3820QM offers 4 cores / 8 threads — the Core i7-12700K has 8 more cores. Boost clocks reach 5 GHz on the Core i7-12700K versus 3.7 GHz on the Core i7-3820QM — a 29.9% clock advantage for the Core i7-12700K (base: 3.6 GHz vs 2.7 GHz). The Core i7-12700K uses the Alder Lake, Golden Cove, Gracemont (2021) architecture (10 nm), while the Core i7-3820QM uses Ivy Bridge (2012−2013) (22 nm). In PassMark, the Core i7-12700K scores 34,347 against the Core i7-3820QM's 5,607 — a 143.9% lead for the Core i7-12700K. L3 cache: 25 MB (total) on the Core i7-12700K vs 8 MB (total) on the Core i7-3820QM.

The Core i7-12700K uses the LGA1700 socket (PCIe 5.0), while the Core i7-3820QM uses PGA988 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches 4800 on the Core i7-12700K versus DDR3-1600 on the Core i7-3820QM — the Core i7-12700K supports 199.8% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-12700K supports up to 128 of RAM compared to 32 GB — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 20 (Core i7-12700K) vs 16 (Core i7-3820QM) — the Core i7-12700K offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Z690,B660 (Core i7-12700K) and HM75,HM76,HM77,QM77,QS77 (Core i7-3820QM).

Only the Core i7-12700K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x, VT-d (Core i7-12700K) vs VT-x, VT-d, EPT (Core i7-3820QM). Both include integrated graphics — Intel UHD Graphics 770 (Core i7-12700K) and HD Graphics 4000 (Core i7-3820QM) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i7-3820QM targets High Performance Laptop. Direct competitor: Core i7-12700K rivals Ryzen 7 5800X; Core i7-3820QM rivals A10-4600M.