Overclocking my memory

[Thimblewad]

Hi guys!
I'm currently in the process of overclocking my RAM. It's a Crucial Sport 2400 MHz kit and I was able to push it to 2933 MHz using a higher DIMM voltage (1,20 → 1,45 V), still using XMP.
The only voltage I've played with was the DIMM voltage. I can also change the DDRVPP voltage (2,5 V) and DRAM Termination voltage (0,6 V).

Would changing any one of these two help with the overclock?

Thanks!

 

[TheLostSwede]

Usually no, at least not in my experience. Normally you shouldn't have to poke around with those.
You've also most likely hit close what your CPU/memory controller is going to max out at, you might be able to get to 3000 or 3066, but that's about it, unless you got Samsung B-dies, which those modules aren't, since they use Micron memory.

 

[kapone32]

You have a 1700 and X370 board. When I was on that platform I could not get my RAM past 2933 MHZ. Changing voltages did not allow that to go any higher. I do believe you are at the max the platform will support. If you want to feel snappier try to tighten the timings. I have no idea where you are but as close to 15-15-15-36 would make the system feel more responsive.

 

[TheLostSwede]

You have a 1700 and X370 board. When I was on that platform I could not get my RAM past 2933 MHZ. Changing voltages did not allow that to go any higher. I do believe you are at the max the platform will support. If you want to feel snappier try to tighten the timings. I have no idea where you are but as close to 15-15-15-36 would make the system feel more responsive.

That's not true. 3,400MHz is possible with some memory, more specific, certain Samsung B-die based modules.
On other modules, 3,066MHz is about as fast as you'll get, maybe 3,200MHz if you're lucky.

 

[Thimblewad]

I've tried to lower the CAS timing to 15 from 16 but that doesn't work too well, haha. My desktop icons dissapear and things stop opening after a few minutes of usage. Well, since the sticks were cheap and are rated 2400 MHz I'm pretty happy with the results so far. I'll try to bump up the voltage a bit, maybe to 1,47 or 1,48 V and try some more.

So CAS gives the most performance, right?

What about lowering the last two, my sticks are 16-16-16-39-55. I find it funny how they still work with XMP being clocked this much higher!

 

[TheLostSwede]

I've tried to lower the CAS timing to 15 from 16 but that doesn't work too well, haha. My desktop icons dissapear and things stop opening after a few minutes of usage. Well, since the sticks were cheap and are rated 2400 MHz I'm pretty happy with the results so far. I'll try to bump up the voltage a bit, maybe to 1,47 or 1,48 V and try some more.

So CAS gives the most performance, right?

What about lowering the last two, my sticks are 16-16-16-39-55. I find it funny how they still work with XMP being clocked this much higher!

You can try this, it'll make your life easier than just guessing. CAS and tRFC seems to have the biggest effect on latency.

DRAM Calculator for Ryzen

DRAM calculator for Ryzen helps with overclocking your memory on the AMD Ryzen platform. It suggests memory timing sets optimized for your memory k

www.techpowerup.com

 

[kapone32]

That's not true. 3,400MHz is possible with some memory, more specific, certain Samsung B-die based modules.
On other modules, 3,066MHz is about as fast as you'll get, maybe 3,200MHz if you're lucky.

Thanks for that I was going based on my experience with the 1700 and X370. I was using Corsair Vengeance 3200 MHZ.

 

[damric]

Yeah Samsung might be better overall but you can still do a lot with Micron and Hynix if you are willing to put in the effort. Running my Hynix DJR at 3333/14 on 1st gen Ryzen and x370. Pump SOC voltage.

 

[Thimblewad]

You can try this, it'll make your life easier than just guessing. CAS and tRFC seems to have the biggest effect on latency.

DRAM Calculator for Ryzen

DRAM calculator for Ryzen helps with overclocking your memory on the AMD Ryzen platform. It suggests memory timing sets optimized for your memory k

www.techpowerup.com

My sticks are Micron B-dies and when I input my frequencies, the latencies I get from the calculator are horribly high so I decided to do stuff on my own.

Here's what DRAM Calculator gives me, and as you can see in the right columns, my latencies are way tighter:

Yeah Samsung might be better overall but you can still do a lot with Micron and Hynix if you are willing to put in the effort. Running my Hynix DJR at 3333/14 on 1st gen Ryzen and x370. Pump SOC voltage.

SOC voltage being VCORE SOC(DVID)? How much of a bump should I give it, 50 mV?

Also, here's my score at 3,7 GHz (SMT off) and the timings you see in CPU-Z:

 

[damric]

I had to put my SOC at 1.21v to get rock solid stable. AMD put theirs at 1.2v in an OC example: https://www.amd.com/system/files/2017-03/AMD-Ryzen-Processor-and-AMD-Ryzen-Master-Overclocking-Users-Guide.pdf

 

[Thimblewad]

I had to put my SOC at 1.21v to get rock solid stable. AMD put theirs at 1.2v in an OC example: https://www.amd.com/system/files/2017-03/AMD-Ryzen-Processor-and-AMD-Ryzen-Master-Overclocking-Users-Guide.pdf

But SOC reading with default settings on my BIOS page shows 0,95 V, is this correct? I don't want to fry anything

I think I've reached the limits of my CPU/RAM combo and I'm pretty happy with the results. Lowering the timings further yields a black screen and so does trying 3000 MHz. My RAM voltage is currently sitting at 1,48 V and it's as high as I'd like to go for 24/7 use.

Here's my CPU-Z validation

 

[TheLostSwede]

My sticks are Micron B-dies and when I input my frequencies, the latencies I get from the calculator are horribly high so I decided to do stuff on my own.

Here's what DRAM Calculator gives me, and as you can see in the right columns, my latencies are way tighter:
View attachment 135812



SOC voltage being VCORE SOC(DVID)? How much of a bump should I give it, 50 mV?

Also, here's my score at 3,7 GHz (SMT off) and the timings you see in CPU-Z:
View attachment 135813

It's just a tool. It's obviously hard to say how well different kits behave and how they've been binned, but it takes a lot of guess work out where to start tuning from and thus saves you a lot of time.
I can also use slightly tighter timings than what the memory calculator spits out.
In your case, those tighter timings are costing you an extra 0.1V on the RAM compared to the suggestions in the memory calculator.

 

[Vya Domus]

Would changing any one of these two help with the overclock?

The real question should be would any of this make a difference ? 3000 Mhz is just about the highest you can go and still notice an improvement, beyond that you're looking at indiscernible performance gains.

 

[Thimblewad]

The real question should be would any of this make a difference ? 3000 Mhz is just about the highest you can go and still notice an improvement, beyond that you're looking at indiscernible performance gains.

Performance difference is only apparent in heavy all core usage such as rendering, because I got to increase the CCX speed and I'm really happy with it. Single core performance got up a bit by getting CAS to 15 and I think that's all I'm getting here.
Stuck on 2933 MHz CL15 and that's more than okay