Intel Core Ultra 7 265T socket: LGA 1851

What the Core Ultra 7 265T is

The Intel Core Ultra 7 265T is the power-optimized 20-core member of the Core Ultra 200S Arrow Lake desktop stack on Socket LGA 1851. It runs 20 cores at 1.5 GHz Performance-core base with boost to 5.2 GHz and Turbo Boost Max 3.0 to 5.3 GHz alongside 1.2 GHz Efficient-core base to 4.6 GHz, backed by 30 MB of Intel Smart Cache plus 36 MB of L2 and a 35 W base power with 112 W maximum turbo power. Intel launched the 35 W range in January 2025 at a 384 USD recommended price, built on TSMC N3B.

Twenty cores at 35 W suit compact workstations, quiet creation PCs and small labs where thread count must fit a slim thermal budget. The low 1.5 GHz P-core base keeps the envelope in reach for compact coolers, while favored-core boosts to 5.3 GHz clear interactive spikes. Platform AI throughput of 33 TOPS covers on-device assistance.

Against the 65 W Intel Core Ultra 7 265 twin above it, the 265T trades base clocks for a 30 W lower envelope at identical core counts. Against the 35 W 14-core Intel Core Ultra 5 245T below it, the 265T adds 6 cores for denser parallel work. T-series parts ship in trays for system integrators. See Socket vs chipset: what decides whether a CPU works for why chipset series plus BIOS revision together decide board fit.

Socket and motherboard compatibility

The 265T fits LGA 1851 in the FCLGA1851 package, the same socket as the rest of the Core Ultra 200S family. Boards with 800 series chipsets such as B860, Q870 and H810 take Arrow Lake at matching power classes, but the 265T must appear by name on the vendor CPU list rather than being assumed from socket fit.

Memory is DDR5 up to 6400 MT/s in two channels. LGA 1851 is DDR5 only, so DDR4 kits from older towers do not carry over. A move from any other socket is a full platform change with board, memory and cooler replaced together.

Memory, PCIe and cooling

Memory on LGA 1851 for this class is DDR5 up to 6400 MT/s in two channels. Two channels keep 20 threads supplied in creation and lab mixes where the working set fits small tower memory sizes. Population order follows the board manual.

PCI Express connectivity is 24 lanes from the CPU across PCIe 5.0 and 4.0. That lane budget feeds a compact discrete card or an NVMe boot drive without strain. Lane splits follow the board block diagram, so builders confirm slot wiring before adding cards.

Cooling uses standard LGA 1851 retention, and the 35 W class suits low-profile air coolers in slim chassis. Firmware power limits scale between 35 W base and the 112 W turbo ceiling. An AI Boost NPU covers entry on-device assistance beside CPU and graphics.

Upgrade paths

On the same socket, the path up from the 265T starts with the 65 W Intel Core Ultra 7 265 twin for higher sustained clocks on LGA 1851 boards where cooling allows. The 24-core Intel Core Ultra 9 285T beside it adds cores at the same 35 W class. Each move needs a BIOS that knows the target SKU.

The step down to the 35 W Intel Core Ultra 5 245T trims cores for a lower price. A move to LGA 1700 is a different platform with DDR4 options. That change replaces board, memory and cooling from scratch.