What's the best RAM clock speed for the Ryzen 9 5900X?

[jacknee45]

Is the 4000+MHz even upheld? I've perused (from posts 7 months prior) that Ryzen 5000 series worked most ideally with 3200MHz to keep the texture 1:1 or something, which I have no clue about what that implies. My MOBO upholds DDR4 RAM up to 4000MHz so that is enticing, however does the Ryzen 9 5900X help that, and assuming it does, is it advantageous or will it at any point be in the future with this CPU?

Edited July 27, 2022 by jacknee45

[Hiob]

The default infinity fabric clock is 1800 Mhz. Very few 5900X/MoBos can be overclocked to 1900 Mhz IF stable. When you run 3600 Ram (which has a "clock" of 1800 MHz) all is in sync, which is generally regarded as optimum.

Though higher speed ram will probably work, there is vastly diminishing return beyond 3600 MHz RAM.

Regarding 3200 vs. 3600. 3200/CL14 is a tiny fraction faster than 3600/CL16. (You won't feel it, let alone measure it).

Personal opinon: Given all those (3200 MHz, 3600 MHz, 4000 MHz) are from good quality and have reasonable XMP profiles (which isn't a given sadly) - it won't make a meaningful difference for daily usage or DCS. You will notice any difference only with artificial benchmarks. All will run stable, if the MoBo supports them and the timings are correct. Personally, I would skip 4000er RAM, due to its higher price, and go with 3600 or even 3200.

 

Edit: If you are interested in the matter and eager to learn, I'd recommend the youtube channel of "Actual Hardcore Overclocking".

Edited July 27, 2022 by Hiob

[BitMaster]

Hiob's spot on.

Stick with 3600 or 3200 MHz, both preferably with low latency.

If you check my sig, I run 3200CL14 @ 3600CL14 with just a little voltage bump, rocksolid in 24/7 ever since.

It heavily depends on your CPU if RAMs faster than 3600 will work and make sense. Since you are asking RAM questions, I dare to say in your case "Don't even try unless you look for grey hair and a RMA"...and the benfit would be very small if any at all. Higher MHz often comes with more latency and that spoils the whole idea. The best balance of both, + price, is 3200-3600 CL14 to CL16 depending on the market and country etc...

 

 

[Phil_A]

I agree with all, that has been stated.   I have a 5600X running at 1800Mhz IF Clk with two sticks of 3600 CL16 of DDR4 so this would be Dual Channel.   These particular 16GB  memory sticks are Dual Rank.    1800/3600/Dual Channel/Dual Rank is a good and stable config and 32GB of DDR4 is not that expensive now.