Core i9-12900T vs Core i9-9980XE

The Core i9-12900T packs 16 cores / 24 threads, while the Core i9-9980XE offers 18 cores / 36 threads — the Core i9-9980XE has 2 more cores. Boost clocks reach 4.9 GHz on the Core i9-12900T versus 4.5 GHz on the Core i9-9980XE — a 8.5% clock advantage for the Core i9-12900T (base: 1.4 GHz vs 3 GHz). The Core i9-12900T uses the Alder Lake-S (2022) architecture (Intel 7 nm), while the Core i9-9980XE uses Skylake (server) (2017−2018) (14 nm). In PassMark, the Core i9-12900T scores 29,601 against the Core i9-9980XE's 29,127 — a 1.6% lead for the Core i9-12900T. Cinebench R23 multi-core: 22,809 vs 22,000 (3.6% advantage for the Core i9-12900T). Geekbench 6 single-core — the metric most relevant to gaming — records 2,331 vs 1,459, a 46% lead for the Core i9-12900T that directly translates to higher frame rates. Multi-core Geekbench: 12,116 vs 12,177 (0.5% advantage for the Core i9-9980XE). L3 cache: 30 MB (total) on the Core i9-12900T vs 24.75 MB (total) on the Core i9-9980XE.

The Core i9-12900T uses the LGA1700 socket (PCIe 5.0), while the Core i9-9980XE uses LGA2066 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR5-4800 on the Core i9-12900T versus DDR4-2666 on the Core i9-9980XE — the Core i9-12900T supports 22.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Memory channels: 2 (Core i9-12900T) vs 4 (Core i9-9980XE). PCIe lanes: 20 (Core i9-12900T) vs 44 (Core i9-9980XE) — the Core i9-9980XE offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: LGA1700 (Core i9-12900T) and X299 (Core i9-9980XE).

Only the Core i9-9980XE has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support AVX-512 instructions, benefiting scientific computing, AI inference, and encryption workloads. Both support VT-x, VT-d virtualization. The Core i9-12900T includes integrated graphics (UHD Graphics 770), while the Core i9-9980XE requires a dedicated GPU. Primary use case: Core i9-9980XE targets HEDT / Workstation / Content Creation. Direct competitor: Core i9-9980XE rivals Ryzen Threadripper 2950X.

The Core i9-12900T launched at $489 MSRP, while the Core i9-9980XE debuted at $1979. At current prices ($378 vs $593), the Core i9-12900T is $215 cheaper. In terms of value (PassMark points per dollar), the Core i9-12900T delivers 78.3 pts/$ vs 49.1 pts/$ for the Core i9-9980XE — making the Core i9-12900T the 45.8% better value option.