Crucial CT51264AC667 4 GB (1x4GB DDR2-667)

The Crucial CT51264AC667 4 GB ships as a single module with 4GB of DDR2 on board. Operating voltage sits at 1.35V. It is rated at 667 MT/s with a CAS latency of 5, working out to a true latency of about 15ns. For gaming, capacity matters more than raw speed past 3600 MT/s — 4GB comfortably covers esports and everyday use.

Use the PlanMyPC system builder to verify it works alongside your other components and to watch live retailer pricing. Warranty coverage follows Crucial's standard policy — confirm regional terms on the listing. The full specification sheet below breaks out every listed detail, and the compatibility checker flags conflicts with parts already in your build.