Intel Core Ultra 5 245 socket: LGA 1851

What the Core Ultra 5 245 is

The Intel Core Ultra 5 245 is the higher-clock 14-core member of the Core Ultra 200S Arrow Lake desktop stack on Socket LGA 1851. It runs 14 cores at 3.5 GHz Performance-core base with boost to 5.1 GHz alongside 3.0 GHz Efficient-core base to 4.5 GHz, backed by 24 MB of Intel Smart Cache plus 26 MB of L2 and a 65 W base power with 121 W maximum turbo power. Intel launched the 65 W range in January 2025 at a 270 USD recommended price, built on TSMC N3B.

Fourteen cores at high base clocks suit development PCs, streaming rigs, home labs and mainstream gaming boxes where sustained frequency matters more than maximum threads. The 3.5 GHz P-core base leads the 65 W Ultra 5 range, so compiles and renders hold pace under cooling, while bursts to 5.1 GHz clear interactive spikes. Platform AI throughput of 29 TOPS covers on-device assistance.

Against the 14-core Intel Core Ultra 5 235 below it, the 245 adds base frequency across both core types for faster sustained work. Against the 20-core Intel Core Ultra 7 265 above it, the 245 trims cores for a lower price. Workstation use-conditions widen deployment options. 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 245 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 Z890, B860, W880, Q870 and H810 take Arrow Lake at matching power classes, but the 245 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, streaming and gaming mixes where the working set fits 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 mainstream discrete card plus 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 65 W class suits stock-style air coolers. Firmware power limits scale between 65 W base and the 121 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 245 starts with the 20-core Intel Core Ultra 7 265 for more cores on LGA 1851 boards where the budget allows. Each move needs a BIOS that knows the target SKU.

The step down to the 14-core Intel Core Ultra 5 235 trims base clocks for a lower price, while the 35 W Intel Core Ultra 5 245T keeps the same cores at lower clocks for compact builds. A move to LGA 1700 is a different platform with DDR4 options. That change replaces board, memory and cooling from scratch.