4GB Total memory using 2PC 2GB 667MHz Module 240pin dimm DDR2 5300. 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 CMSMax Memory 8GB Sockets 4
Compatible with: ASUS P5 SERIES P5N-E SLI, P5N-D, P5N-T Deluxe Motherboard 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.