Core Ultra 7 255H vs Core i7-12800HX

The Core Ultra 7 255H packs 16 cores / 16 threads, matching the Core i7-12800HX's 16 cores. Boost clocks reach 5.1 GHz on the Core Ultra 7 255H versus 4.8 GHz on the Core i7-12800HX — a 6.1% clock advantage for the Core Ultra 7 255H (base: 4.4 GHz vs 2 GHz). The Core Ultra 7 255H uses the Arrow Lake-H (2025) architecture (5 nm), while the Core i7-12800HX uses Alder Lake-HX (2022) (Intel 7 nm). In PassMark, the Core Ultra 7 255H scores 30,932 against the Core i7-12800HX's 31,229 — a 1% lead for the Core i7-12800HX. Geekbench 6 single-core — the metric most relevant to gaming — records 2,800 vs 1,962, a 35.2% lead for the Core Ultra 7 255H that directly translates to higher frame rates. Multi-core Geekbench: 15,700 vs 15,000 (4.6% advantage for the Core Ultra 7 255H). L3 cache: 24 MB on the Core Ultra 7 255H vs 25 MB (total) on the Core i7-12800HX.

The Core Ultra 7 255H uses the FCBGA2049 socket (PCIe 5.0), while the Core i7-12800HX uses FCBGA1964 (PCIe 5.0) — making them incompatible on the same motherboard. Both support up to DDR5-6400 memory speed. Both support up to 128 GB of RAM. Both feature 2-channel memory with ECC support. PCIe lanes: 28 (Core Ultra 7 255H) vs 20 (Core i7-12800HX) — the Core Ultra 7 255H offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: HM870,WM880 (Core Ultra 7 255H) and HM670,WM690 (Core i7-12800HX).

Only the Core i7-12800HX has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Virtualization support: VT-x, VT-d (Core Ultra 7 255H) vs VT-x, VT-d, EPT (Core i7-12800HX). Both include integrated graphics — Intel Arc Graphics 140T (Core Ultra 7 255H) and Intel UHD Graphics 770 (Core i7-12800HX) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core Ultra 7 255H targets High-End Laptop, Core i7-12800HX targets Extreme Gaming Laptop. Direct competitor: Core i7-12800HX rivals Ryzen 7 6800HX.