Corsair Introduces Dominator RAM With Cooling Fans

is a more technical explanation on what CAS means.

Only the most demanding users will grab this, partially thanks to the $600 price tag on the fanned model and the $400 for the non-fanned model. Pretty expensive, but if you want the top performance for your gaming rig, you’d better hope your mommy and daddy are willing to bump up your allowance.

Corsair DRAM Adds Cooling Fan [Extreme Tech via Uber Gizmo]