4GB Total memory using 1PC 4GB 800MHz Module 240pin dimm DDR2 6400. This module is non ecc. Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS. Max Memory 16GB Sockets 4
Compatible with: ASUS/ASmobile P5 Motherboard P5Q Premium ASUS/ASmobile P5 Motherboard P5Q Pro MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode. If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). * A 64-bit Operating System is required to utilize more than 4GB of memory.