The G.Skill kit for desktop has 2 DDR4 RAM memories, speed at 2666, with a total capacity of 8GB. The response time of the RAM memory to the commands it receives from the system is called CAS Latency. The smaller the better for memories with the same frequency, otherwise frequency is more important for memory speed. The kit memories have CAS Latency 15. Size: DIMM Speed: 2666 Type: DDR4