Whats better RAM?

[MAXimum01]

Whats better out of 4000Mhz cl18 or 3600Mhz cl16? i will put this on a b450m Mortar Max...

 

Note that the 4000Mhz is $25 cheaper. Ill be running a Ryzen 7 3700X and Gigabyte rx 5700 xt

 

Thanks, Max

[Mephi00]

I think that 3600 cl16 is the better choice here, because ryzen barely benefits from clockspeeds that high, the tighter timings will suit the ryzen chip better.

As an option, you could get the 4000mHz dimms and downclock them with tighter timing, so you might be able to match 3600 cl16.

[Constantin]

Go for the 4000Mhz the mobo support it

[MAXimum01]

Just now, Constantin said:

Go for the 4000Mhz the mobo support it

Yeah maybe i will. Thanks. But ive heard AMD doesn't benefit as much from Mhz that CAS latency

[MAXimum01]

Just now, Mephi00 said:

I think that 3600 cl16 is the better choice here, because ryzen barely benefits from clockspeeds that high, the tighter timings will suit the ryzen chip better.

As an option, you could get the 4000mHz dimms and downclock them with tighter timing, so you might be able to match 3600 cl16.

Im not that knowledgeable about RAM but i dont think the G.Skill Ripjaws V 16GB (2x8GB) 4000MHz CL18 DDR4 can down-clock to cl16? even at $25 more you'd say go for the 3600Mhz

[boggy77]

go for the 4000. you can definitely downclock it to 3600 and tighten the timings to at least c16. for 25$ less, it's clearly the better choice.

[nick name]

You're not telling us enough about the kits for us to tell you for sure.  If that 4000CL18 kit is a Hynix CJR kit then it runs faster, but you won't get the tightest timings.  If that 3600CL16 kit is Samsunb b-die then get that over the Hynix CJR kit as it will have better odds of getting the tightest timings and you won't want to run 4000MHz RAM speed.

 

If you're going for the fastest speed you can you will also want the fastest IF (Infinity Fabric) speed on the CPU as well.  What that means is you'll likely not be able to run RAM speed faster than 3800MHz and 3733MHz is more likely.  That's because 1900MHz IF (or most likely a little slower) is the limit for the majority of people.  Do note though that many folks struggle to get 1900MHz IF stable and I'm only saying it because its a nice round number.