Ryzen 7 2700x, x470 RAM Overclock HELP!?

[rmonkey100]

Got my new Ryzen 2700x & x470 Asus ROG Swift-F motherboard today & I have clocked the CPU to a stable 4.2ghz at about 1.34v, but the RAM I am having trouble with, Corsair Vengeance DDR4 3400mhz 32GB, (4x 8GB)

I just can't get it to clock past 2933mhz without crashing, timings are standard XMP 16-18-18-18-36-1T 1.35v, but any higher than 2933 it just doesn't like it,

any ideas or help would be appreciated!

 

[rmonkey100]

It's ryzen and the dimms are not Samsung b die so I am not surprised your having issues.

Try to tune soc voltage, proc odt to around 60 ohms and set 2T command rate. This could get you higher but in testing I found one in ten chips could not do 3200 due to either imc or infinity fabric issues.

Thanks I'll have a play around with it with those suggestions! what RAM would you recommend for Ryzen that has Samsung B-Die?

 

[rmonkey100]

2.9 GHz on the memory for four sticks isn't bad, at all. Tighten the latencies to something lower than these 16-18-18-18-36-1T and call it a day.

I'll have a play around with Timings, what would you recommend?..on the timings page on bios there are so many more options to change than my old motherboard!

 

[rmonkey100]

Well, try with 14-16-16... if it works, then tighten further to 14-14-14.

I changed it to 3066mhz with 14-16-16-16-34-1T timings & 1.37v & ran prime for 15mins & seems stable so far, does SOC voltage for RAM have a different name as I can't find anything called SOC RAM voltage?

 

[rmonkey100]

AMD CPU's have not been particularly good with all memory slots populated, iirc in the Phenom 2 DDR3 days they were officially rated at 1600mhz with 2 sticks but only 1333mhz with 4. You are putting a lot more stress on the memory controller with the memory slots fully populated.

Ah that makes sense then, I think I've done well to hit 3066mhz with the timings I have with all 4 slots filled then!