Intel Core Ultra 5 235T socket: LGA 1851

What the Core Ultra 5 235T is

The Intel Core Ultra 5 235T is the power-optimized 14-core member of the Core Ultra 200S Arrow Lake desktop stack on Socket LGA 1851. It runs 14 cores at 2.2 GHz Performance-core base with boost to 5.0 GHz alongside 1.6 GHz Efficient-core base to 4.4 GHz, backed by 24 MB of Intel Smart Cache plus 26 MB of L2 and a 35 W base power with 114 W maximum turbo power. Intel launched the 35 W range in January 2025 at a 247 USD recommended price, built on TSMC N3B.

Fourteen cores at 35 W suit small-form-factor development PCs, quiet home labs and office towers where heat and noise matter more than sustained draw. The 2.2 GHz P-core base keeps the low envelope in reach for compact coolers, while bursts to 5.0 GHz clear interactive and compilation spikes. Platform AI throughput of 27 TOPS covers on-device assistance.

Against the 65 W Intel Core Ultra 5 235 twin above it, the 235T trades base clocks for a 30 W lower envelope at identical core counts. Against the 35 W 10-core Intel Core Ultra 5 225T below it, the 235T adds 4 E-cores for denser multitasking. 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 235T 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 235T 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 14 threads supplied in development and office 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 114 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 235T starts with the 65 W Intel Core Ultra 5 235 twin for higher sustained clocks on LGA 1851 boards where cooling allows. The 35 W 14-core Intel Core Ultra 5 245T beside it adds P-core clocks 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 225T trims E-cores for budget small builds. A move to LGA 1700 is a different platform with DDR4 options. That change replaces board, memory and cooling from scratch.