DDR4 2666 MHz,CL15 or 2133 MHz,CL14

[Jetyo]

Which one is better? Price is almost the same.

 

[Calculagator]

All other things being equal, the 2666 should be faster in every way. If the price is close, get the faster RAM.

 

[Gingerbread]

Can your motherboard support 2666? What is your motherboard. If it can support 2666 then it's better, if not, then the 2666 will run at 2133 but with cl15 so it will be worse. Both cases - you won't notice a difference.

 

[Jetyo]

Can your motherboard support 2666? What is your motherboard. If it can support 2666 then it's better, if not, then the 2666 will run at 2133 but with cl15 so it will be worse. Both cases - you won't notice a difference.

I think the Asus Z170-A can handle 2666.

 

[Gingerbread]

Yeah it can, if that's the case then the 2666 is the better choice.

 

[Jetyo]

Yeah it can, if that's the case then the 2666 is the better choice.

BTW, Why does it say (O.C.):
3400(O.C.)/3333(O.C.)/3200(O.C.)/3100(O.C.)/3000(O.C.)/2933(O.C.)/2800(O.C.)/2666(O.C.)/2600(O.C.)/2400(O.C.)/2133(O.C.)
Do I need to overclock it?

 

[Gingerbread]

No, because it is overclocked, but you will have to set its timing and speed in BIOS (easy job, just read the timing of the memory and set it manually in bios).

 

[Calculagator]

Can your motherboard support 2666? What is your motherboard. If it can support 2666 then it's better, if not, then the 2666 will run at 2133 but with cl15 so it will be worse. Both cases - you won't notice a difference.

It doesn't really matter for the OP, but usually, when memory has to run at lower clocks because of motherboard limitations, it also runs at lower latency. 2666 CL15 RAM running at 2133 will probably use CL13 or CL14. The only way to know for sure is to look at the RAM's SPD info.