How important is RAM speed

[Bmoney]

I am upgrading Ram to corsair dominator which comes in like 20 speeds now. My motherboard will handle RAM up to 3333 MHz but my CPU i-7 6900k says it only supports upto 2400MHz so do I need anything higher than that expect for maybe future proofing?

[Oshino Shinobu]

For most things, it makes very little difference. More productivity based programs can benefit a little, but it's still not a lot. 

 

Honestly, I would go for whichever speed is cheapest (it's not always the slowest that's cheapest BTW). 

[Thony]

This important: 

 

[Gonio]

It currently seems that 2400 or 2666 is a good sweet spot for speeds vs cost for DDR4, but in general going much higher then that often does not bring much if any at all performance increase. Very specific RAM usage scenarios can benefit, but in general this can be upgraded by a more senseable manner in the form of a different part that is holding back.

 

Check my guide in the signature, it has a chapter about RAM that is going more in depth of why this is.

[Bmoney]

Thanks Ya'll seriously this is the best community on the web!

[JoostinOnline]

It only matters during CPU intensive tasks.