RAM OC Potential

[Dean.P.]

I'm running Corsair Vengeance LPX DDR4 3200MHz Memory CL16, with AMD 3900x and the Crosshair Hero VIII (WiFi) X-570. I am curious to know how much higher I can get the memory speeds to the RYZEN optimal 3600mhz and whether to achieve this I will need to sacrifice the timings. I know there are a lot of factors affecting this like silicon lottery and the memory module manufacturer. However, I was wondering if anyone has had any experience in trying to push this memory. I selected this memory due to being a low profile and my worries of it not fitting alongside my Noctua NH-D15 CPU cooler and my smallish Fractal Design Meshify C case. Any and all insight is greatly appreciated!  

[Jurrunio]

The only way to know for sure is to try it, period. A tip for timings is that when your memory kit is unstable at higher frequencies, raise tRCD and tRP first. Something like 20-26-26-46 is ok if you need loose timings to get frequency high

[Dean.P.]

3 minutes ago, Jurrunio said:

The only way to know for sure is to try it, period. A tip for timings is that when your memory kit is unstable at higher frequencies, raise tRCD and tRP first. Something like 20-26-26-46 is ok if you need loose timings to get frequency high

So if I were able to get 3600mhz to boot would I then try and work down the timings gradually? 

[Jurrunio]

4 minutes ago, Dean.P. said:

So if I were able to get 3600mhz to boot would I then try and work down the timings gradually? 

you should push memory frequency even higher while keeping FCLK at half the memory's data rate (3600 here is data rate, actual clock is half that, hence the name DDR)

[Dean.P.]

11 minutes ago, Jurrunio said:

you should push memory frequency even higher while keeping FCLK at half the memory's data rate (3600 here is data rate, actual clock is half that, hence the name DDR)

Thanks man, this is my first build, just looking to enjoy tweaking it over time to hopefully maximise the potential.

[Constantin]

I have the same memory, i set it to 3500Mhz without setting anything else

[porina]

Make sure you're on latest bios, with at least AGESA Combo-AM4 1.0.0.3 as they continue to tweak the memory compatibility. 

 

At a simple level, you could increase clocks and slacken timings and see how far you get just doing that.

 

At a not so simple level, download Thaiphoon Burner and use that to find out what chips are in your ram module. It is good info and may be used to feed the calculator below. http://www.softnology.biz/files.html

 

Download Ryzen Memory Calculator, and use that as a starting point for your tinkering. Don't take the values for granted, you may need to adapt. In my play with Samsung B-die, I had to use more voltage than it recommended and also slack tRFC to get rid of errors during stability testing.

https://www.techpowerup.com/download/ryzen-dram-calculator/

 

And good luck... ram OC is still full of uncertainty. Do test stability as ram errors have a much higher chance of silent data corruption than a CPU overclock does.

[Dean.P.]

3 minutes ago, porina said:

Make sure you're on latest bios, with at least AGESA Combo-AM4 1.0.0.3 as they continue to tweak the memory compatibility. 

 

At a simple level, you could increase clocks and slacken timings and see how far you get just doing that.

 

At a not so simple level, download Thaiphoon Burner and use that to find out what chips are in your ram module. It is good info and may be used to feed the calculator below. http://www.softnology.biz/files.html

 

Download Ryzen Memory Calculator, and use that as a starting point for your tinkering. Don't take the values for granted, you may need to adapt. In my play with Samsung B-die, I had to use more voltage than it recommended and also slack tRFC to get rid of errors during stability testing.

https://www.techpowerup.com/download/ryzen-dram-calculator/

 

And good luck... ram OC is still full of uncertainty. Do test stability as ram errors have a much higher chance of silent data corruption than a CPU overclock does.

Thanks, I will give that a look, Buildzoid did a video basically depicting this. I will run quite a few mem tests as although I want to get the most out of my RAM I don't want it crashing on me every few days.

[Mathieu9836]

You will probably be able to OC it to something around 3333-3466 without loose timings, depending if it'S hynix or micron dies it may or may not scale with 1.4-1.5 volts, other then that if you need to loosen the timings to 18-20-20-20-44 to acheive 3400mhz or higher you will be increasy latency, which means you loose perfomance. But thats always interesting to see how much you can OC your RAM sticks before they refuse to go any higher. I'm running 3000mhz CL16-18-18-38 Hynix A-die 16gb kit to 3200mhz 15-17-17-17-35 at 1.35volts, it refuse to have tighter timings and is not stable with 3333mhz even at 1.5volts but i can boot with 3466mhz 1.5volts

[Dean.P.]

13 hours ago, Mathieu9836 said:

You will probably be able to OC it to something around 3333-3466 without loose timings, depending if it'S hynix or micron dies it may or may not scale with 1.4-1.5 volts, other then that if you need to loosen the timings to 18-20-20-20-44 to acheive 3400mhz or higher you will be increasy latency, which means you loose perfomance. But thats always interesting to see how much you can OC your RAM sticks before they refuse to go any higher. I'm running 3000mhz CL16-18-18-38 Hynix A-die 16gb kit to 3200mhz 15-17-17-17-35 at 1.35volts, it refuse to have tighter timings and is not stable with 3333mhz even at 1.5volts but i can boot with 3466mhz 1.5volts

Thank mate when my 3900x finally arrives I'm going to start tinkering around, I'm starting to get a good indication of what I can expect to achieve