Crucial CT2KIT25664AA667 4 GB (2x2GB DDR2-667)

The Crucial CT2KIT25664AA667 4 GB arrives as 2 modules of 2GB each with 4GB of DDR2 on board. It is rated at 667 MT/s with a CAS latency of 5, working out to a true latency of about 15ns. Operating voltage sits at 1.35V. 4GB gives you enough headroom for esports and everyday use; past 3600 MT/s, extra frequency brings diminishing returns.

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.