Core i9-9900 vs Core i5-12450H

The Core i9-9900 packs 8 cores / 16 threads, matching the Core i5-12450H's 8 cores. Boost clocks reach 5 GHz on the Core i9-9900 versus 4.4 GHz on the Core i5-12450H — a 12.8% clock advantage for the Core i9-9900 (base: 3.1 GHz vs 2 GHz). The Core i9-9900 uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Core i5-12450H uses Alder Lake-H (2022) (Intel 7 nm). In PassMark, the Core i9-9900 scores 16,238 against the Core i5-12450H's 16,133 — a 0.6% lead for the Core i9-9900. Geekbench 6 single-core — the metric most relevant to gaming — records 1,637 vs 2,100, a 24.8% lead for the Core i5-12450H that directly translates to higher frame rates. L3 cache: 16 MB (total) on the Core i9-9900 vs 12 MB (total) on the Core i5-12450H.

The Core i9-9900 uses the LGA1151 socket (PCIe 3.0), while the Core i5-12450H uses FCBGA1744 (PCIe 5.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i9-9900 versus LPDDR5-5200 on the Core i5-12450H — the Core i5-12450H supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i9-9900 supports up to 128 GB of RAM compared to 64 GB — 66.7% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Core i9-9900) vs 28 (Core i5-12450H) — the Core i5-12450H offers 12 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Z390,B365 (Core i9-9900) and HM670,WM690 (Core i5-12450H).

Neither processor supports overclocking. Virtualization support: VT-x, VT-d (Core i9-9900) vs VT-x, VT-d, EPT (Core i5-12450H). Both include integrated graphics — UHD Graphics 630 (Core i9-9900) and UHD Graphics for 12th Gen (Core i5-12450H) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i5-12450H targets Performance Laptop. Direct competitor: Core i5-12450H rivals Ryzen 5 6600H.