RAM speed trouble

[Billy Pilgrim]

I have recently built a system with 2x8 DDR4 corsair vengeance ram that advertised 3000mhz. I booted my machine up and turned on XMP in bios and set the memory speed to 3000mhz. However in AMD Ryzen master and Geekbench it reports the speed and 1500mhz. When I used the command line it reported the speed as 3000mhz. What is happening?

[Jurrunio]

DDR memory is double data rate, which means they send data twice per clock cycle. It's just a difference between showing the I/O clock and data clock.

[Billy Pilgrim]

Ok Thank you. Just wondering if there would be any advantage to pushing the memory clock higher than 3000mhz?

[Skiiwee29]

3000mhz is the sweet spot for Ryzen. Some will say 3200, but thats only if you have low CL sticks, 15 or 14. After 3000, you get diminishing returns and in some cases you actually lose performance as you increase speeds. 

[Jurrunio]

28 minutes ago, Billy Pilgrim said:

Ok Thank you. Just wondering if there would be any advantage to pushing the memory clock higher than 3000mhz?

Yes if you can keep the memory timings reasonably low while raising the memory frequency, especially the CL value. For simplicity, take frequency devided by CL value. The larger the number, the better. Of course eventually you will experience a crash, so you cant just push things higher up indefinitely.

[Billy Pilgrim]

ok thanks