K8NF4 Series motherboard is based on nVIDIA® nForce 4 Ultra / Standard / 4X chip, supports Socket 939 AMD® AthlonTM 64 /AthlonTM 64 FX processor, can insert DDR400/ 333/ 266 (PC3200/ 2700/ 2100) specification memory, up to 4GB memory capacity can be supported.