I'm building a new PC with a Ryzen 9 9800X3D CPU, and I'm running into some RAM selection issues. I found some 6400MHz CL32 RAM, but the best option available at 6000MHz has a latency of CL38 or CL40. I've read that for X3D processors, the RAM timing isn't as critical, so I'm wondering if going with the 6400MHz option is a good choice despite its higher latency. Also, I've heard you can undervolt RAM somewhat like you would a GPU. Is that accurate? Can I potentially undervolt the 6400MHz RAM to 6000MHz if I run into any problems?
2 Answers
When it comes to RAM performance, the 'first word latency' is key. You can calculate it by multiplying the CAS latency by 2000 and dividing that number by the RAM speed. For instance, 6000MHz CL30 gives you a good 10 ns, and 6400MHz CL32 also lands you at 10 ns! Higher RAM speeds can keep up with lower latency types, so don't stress too much about timing with X3D chips.
If a builder can't provide good RAM like CL30 at 6000MHz, I might reconsider using them. Just make sure you weigh out your other components, too!
I get that! This builder is pretty much accommodating everything else for you. It's just a bit surprising they're off on RAM. At least you're not having too many sacrifices with your build!
That makes sense! This is my first AMD build, usually stick with Intel, so I was confused by all the timing talk and the Infinity Curve stuff. It seems like what I read about timing being less crucial for X3D processors might hold water!