Overview

The Intel Core Ultra 9 285K is the flagship desktop CPU based on the Arrow Lake-S architecture. It combines 8 Performance-cores and 16 Efficient-cores for a total of 24 cores and 24 threads, delivering exceptional single-threaded and multi-threaded performance for the latest games and creative workloads.

With a maximum boost clock of 5.7 GHz, 36 MB of L3 cache, support for DDR5-6400 memory, and PCIe 5.0 connectivity, this CPU is built for high-end systems. It uses the new LGA1851 socket and is best paired with Intel 800-series chipsets (e.g., Z890).

Key Features

  • 8P+16E hybrid architecture (24 cores / 24 threads)
  • Turbo boost up to 5.7 GHz
  • 36 MB L3 cache + 24 MB L2 cache (60 MB total)
  • Dual-channel DDR5-6400 memory support (up to 192 GB)
  • 20 PCIe 5.0 lanes (x16 + x4)
  • Integrated Intel Graphics (Xe-LPG)
  • TDP 125W (PL1), max turbo power 250W

Compatibility Guide

  • Socket: LGA1851 (exclusive to Intel 800-series chipsets; not compatible with LGA1700 or earlier)
  • Memory: DDR5 only (no DDR4 support). DDR5-6400 or higher recommended.
  • Form Factor: Compatible with ATX, Micro-ATX, and Mini-ITX motherboards. However, due to high power draw, a large case with strong airflow and a high-end cooler is advised.
  • PCIe: PCIe 5.0 support. Note that PCIe lanes are shared between GPU and NVMe drives; plan your configuration accordingly.
  • Cooling: A 360mm AIO liquid cooler or high-end air cooler is recommended to handle up to 250W under load.
  • Power Supply: Minimum 850W recommended (1000W+ if pairing with a flagship GPU like RTX 4090/5090).

Ideal Builds

  • High-End Gaming PC: Perfect for playing the latest AAA titles at maximum settings. Pairs well with RTX 5080/5090-class GPUs with minimal bottleneck.
  • Creator Workstation: Excellent for video editing, 3D rendering, compiling, and other multi-threaded tasks.
  • Long-Term Investment: As of 2026, this CPU offers headroom for several years without needing an upgrade.

Upgrade Considerations

  • Bottleneck Risk: At 1080p resolution, the GPU may become the bottleneck in many games. At 1440p or higher, the balance is excellent.
  • Over-Spec Warning: For light browsing or office work, this CPU is overkill. Consider a Core Ultra 5 instead.
  • Upgrade Path: LGA1851 is expected to support at least one more generation (Arrow Lake-S Refresh), allowing future CPU upgrades.
  • Cooling & Case: Ensure your case has enough clearance for a large CPU cooler and good airflow. Mini-ITX builds may face thermal challenges.