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Journeyman III

Compatibility questions with Threadripper 1950x, Asus Prime X399-A & Memory

After 7 years I'm putting together a new build for 3D solid modeling, video editing and processing. I just ordered the the above mentioned items and now am looking for some compatible memory. I've settled on Crucial's Ballistix Sport LT Gray 64GB Kit (4 x 16GB) DDR4-2666 UDIMM (BLS4K16G4D26BFSB) DDR4-2666 • PC4-21300 • 16-18-18 • Unbuffered • NON-ECC • 1.2V

So here's where I could use some guidance and/or help...

1. The mobo has 8 memory slots that support up to 128GB but according the AMD and the 1950x spec page it supports only 4 channels. Does that mean if I install the above listed ram kit I'm maxed out or am I misinterpreting this?

2. The 1950x also states it will support a Max Memory Speed of 2667 MHz which should be compatible with the memory I've selected since the mobo specs are: DDR4 3200(O.C)/ 3000(O.C)/ 2800(O.C.)/ 2666/ 2400/ 2133. From what I understand if you install higher speed ram the mobo will throttle the speed down to what it can use. So if I don't plan to OC is the 2666 MHz the fastest speed I should use?

3. Assuming question 2 is correct and if I ever wanted to OC in the future would I be OK to order something faster like the 2880 MHz or 3000 MHz memory and expect the mobo to ramp the speed down to 2666 in non-OC mode?

I appreciate the help...

1 Reply

1) Each channel is comprised of two slots.

2) Look at the QVL list of your motherboard on its support page, it will tell you which RAM is certified to run on it and at which speeds.

3) Overclocking is done with multipliers, not HT clock manipulation, so that is not a factor.