Intel Xeon w5-2455X socket: LGA 4677

What the Xeon w5-2455X is

The Intel Xeon w5-2455X is the 12-core member of the Sapphire Rapids Xeon W family for LGA 4677 boards from February 2023. 12 cores with hyperthreading give 12 cores and 24 threads, with base at 3.2 GHz and up to 4.6 GHz turbo. The package carries 30 MB of Smart Cache. The 200 W envelope fits standard heatsinks with front to back airflow. Workstation cooling follows the board vendor list with vendor qualified air or liquid for this 200 W class.

DDR5-4800, 4 channels, up to 2 TB with ECC feed the cores for workstation duty, and matched kits hold the rated speed. Sixty four Gen5 lanes per CPU wire GPUs and NVMe on single socket workstation boards, with the exact split fixed per board. Single socket operation keeps workstation design simple with one CPU per board and no multi socket fabric.

Mainstream workstations for CAD and content creation take this part with unlocked tuning on X SKUs, where clocks stay high across the load. Boards need a W790 chipset with the Xeon w5-2455X on the CPU support list, and memory choice stays with DDR5 RDIMMs. The Socket vs chipset: what decides whether a CPU works guide covers board choice, and Intel Xeon w3-2435 shows a nearby option on the same socket.

Socket and motherboard compatibility

The w5-2455X fits LGA 4677 on single socket workstation boards with LGA 4677 retention and workstation power delivery. Board lists must name the Xeon w5-2455X part for qualification.

W790 chipset choice decides IO breadth and overclocking headroom on X SKUs rather than CPU fit. A BIOS that lists Sapphire Rapids W from February 2023 covers the part, while early firmware may need an update for specific stepping IDs. Check the board CPU list before mixing this SKU with other steppings.

Memory, PCIe and cooling

DDR5-4800, 4 channels, up to 2 TB with ECC feed the cores for workstation duty, and matched kits hold the rated speed. Population with matched RDIMMs holds the rated speed, and four channel operation needs one DIMM per channel at minimum for full bandwidth. Capacity reaches 2 TB per socket with high density DIMMs.

Sixty four Gen5 lanes per CPU wire GPUs and NVMe on single socket workstation boards, with the exact split fixed per board. Lane bifurcation follows board firmware, so slot population rules come from the board manual.

The 200 W envelope fits standard heatsinks with front to back airflow. Workstation cooling follows the board vendor list with vendor qualified air or liquid for this 200 W class. The FCLGA4677 package uses a carrier with even mounting pressure. Paste and torque sequence follow the heatsink maker specification for 200 W parts.

Upgrade paths

On LGA 4677 the upward moves are higher core Xeon W parts on the same W790 board where render threads grow, with X SKUs adding tuning headroom. For this 12-core SKU, memory growth to full channel population and GPU additions often help more than clocks.

Outside this SKU, Intel Xeon w3-2435 (Xeon w3-2435) on LGA 4677 trims or adds cores for lighter or denser loads. A move to W-3400 adds channels and lanes, while a move to server Platinum needs a new board and memory plan.