Question Is 6400mhz CAS 32 worse than 6000mhz CAS 30 when paired with Ryzen 7 9800X3D?

[MitchellReece]

Hello,

I want to upgrade my CPU to the 9800X3D which is on a newer socket so I will need a new motherboard and RAM to pair with it.

After a bit of research it seems like the ideal speed and CAS latency to pair with the 9800X3D are 6000mhz/s and CAS 30.

I currently have G.Skill Trident Z RAM and I want to stay with this brand, but have since taken a liking to the G.Skill Royal RAM design.

I was able to find G.Skill Trident Z with the right specs, 6000mhz/s and CAS 30... but with G.Skill Royal RAM I can only find speeds from 6400mhz/s up to 8400mhz/s and varying CAS latency from 32-40.

Although there is a link on G.Skill's product page to the Royal sticks with the right specs, it seems at any retailer they begin at 6400mhz/s at the lowest and with a CAS latency of 32.

It makes sense that instead of 6000mhzs & CAS 30 you get 6400mhz/s & CAS 32, but I just want to confirm whether it's still an ideal speed/latency to pair with a Ryzen 7 9800X3D?

Or, do you think it would be more preferable for me to stay with Trident Z sticks since the ideal specs are available?

Here are the two options for RAM I am considering buying; one & two.

Appreciate any advice you can give to steer me in the right direction and make the right purchases! 😀

 

[faalin]

For gaming the lower CL # will be better, if you're doing anything long calculations like production work then the faster speed will be better.

 

[Lutfij]

After a bit of research it seems like the ideal speed and CAS latency to pair with the 9800X3D are 6000mhz/s and CAS 30.
True!

I've helped a friend build a system with Corsair Dominator Platinum's rated to run at DDR5-6600MHz CL32 on an MSI B650i Edge WiFi + 7800X3D, hasn't complained since it was built.

You can go with anything higher than DR5-6000MHz but how much more are you spending is the question. My friend didn't have any issues with spending since it was a PC he'll be building in nearly 30 or so years.

FYI, those ram kits you're looking at are meant for Intel's platform, I wouldn't invest in them unless it's expressly mentioned they have AMD's E.X.P.O baked into the kit/advertised on them.

What motherboard are you looking at?

Moved thread from Components section to Memory section.

 

[Aeacus]

It makes sense that instead of 6000mhzs & CAS 30 you get 6400mhz/s & CAS 32

Well, calculate the RAM latency.
Formula: (cas latency/ram transfer speed) x 2000 = latency in nanoseconds

Whereby;
(30/6000) x 2000 = 10 nanoseconds
(32/6400) x 2000 = 10 nanoseconds

Both are equal in terms of performance.

I just want to confirm whether it's still an ideal speed/latency to pair with a Ryzen 7 9800X3D?

6000 MT/s, or at most 6400 MT/s, while paired as low CAS Latency as possible.

View: https://www.youtube.com/watch?v=b-WFetQjifc