Thus, higher CAS timings can result in a higher latency even with higher clock speeds. If you have a CAS of 17 and a clock speed of 2666mhz, this would be your true latency: If you have a CAS of 15 and a clock speed of 2400mhz, this would be your true latency: (CAS latency/RAM clock speed) x 2000 = latency in nanoseconds To calculate the true latency of your RAM in nanoseconds, use the following formula: If you tell someone to “duck!”, CAS latency would be the delay between when you command them to duck and when the other person reacts.īut CAS does not exist in a vacuum, and must be put into a formula alongside other specifications in order to determine the true latency of your RAM. The first column represents CAS latency, also known as “Column Access Strobe.” This is the number of clock cycles that pass between when an instruction is given and when the information is made available. It will be listed alongside the RAM with numbers presented in this format: 15-16-16-35. To understand how fast your RAM actually is, you must look at its memory timing. PS3, Wii U-emulation users), but more RAM is almost never the answer as to why a computer is not running a game at your desired performance level. Adding more RAM may be useful for users in certain RAM-hungry situations (heavily tabbed Chrome users, 3D rendering/modeling program users, and recent console-e.g. This is why adding more RAM will not necessarily make your computer faster: you’re adding more lanes to the road and more car capacity, rather than increasing the speed limit. Therefore, a stick of 8GB RAM with a clock speed of 2666mhz can process 8GB of data at a given time, and 2666mhz is the speed at which the information will be processed. And the speed of your RAM is like the speed limit sign posted on the highway. The size of your RAM, in this analogy, would be how many cars each lane can hold. The number of RAM sticks is kind of like the number of lanes on the road: the more sticks of RAM you have, the more lanes you have open, and the more cars the road can hold at a given time. How many browser tabs can you keep open, how many layers can you have open in Photoshop, and how fast will your game load? All of this is directly affected by your choice of RAM. Choosing RAM can be daunting, because this decision may have a tangible impact on your user experience.

Ddr4 speed chart