CPU MEMORY SUPPORT

[kiki443]

Hello

 

I have a question regarding AMD's memory specification, or better I need some clarification and help to understand something.

 

short question: can I increase speed in MHz (thatr means overclock) RAM beyound what AMD says that perticular CPU supports?

 

TL;DR question: I have AMD Ryzen 5 3600 CPU with 1 module of Corsair LPX 3000 16 GB memory on MSI B450 Tomahawk, here AMD says that CPU supports up to 3200 MHz (System Memory Specification: 3200MHz), that I overclocked and it is stable, without needing to increase voltage or anything else, so now I have RAM working on 3200 MHz. However my motherboard supports and actually it allows me to increase frequency of RAM over 4000 MHz, I am trying to understand how can that work, even many people are recomending overclocking to those frequencies, or getting faster, more expensive modules out of the box. I did try to increase it further, than I get a few errors in benchmark (using Ryzen DRAM Calculator integrated benchmark), didn't try bumping the voltages, since I thought, there is no point in going above 3200 because the CPU supports that, if I go above it would perhaps downclock to that speed anyway, so instead I concentrated on timings, but now I see my kit actually has a lot of OC potential. So now it leaves a little confusion, and I can't find a solid answer anywhere, some people are recomending geting faster memory, or overclock to say 3600 or 4000 or whatever, at this moment I fail to see the point why and how would that actually make a difference, in this particullar scenario. I mean if I do overclock it to say 3600 will it actually work on that, or do I have to also change something else, pehaps NB frequency (UCLKor something), what does AMD refer to when they say "System Memory Specification", is that max suported speed or more like a guideline on what memory to pick?

 

What actually enhanced my confusion is the fact that a simmilar APU 3400G has Memory specification of 2933 MHz, in another computer I have that with the same motherboard, and Corsair RGB PRO 2x8 GB 3000 MHz, now here I can't go above 2933 at all, than again due to some compatiility reasons between the BIOS and that particular kit, I can't change anything besides primary voltages and timings (no secundary or tetriary timings, no CAD_BUS timings or impedances, no phy configurations, no advanced voltage controls like VDDP, VPP, VDDG etc., and ofcourse no UCLK, or similar fabric related settings, or ability to go beyond 2933 MHz). 

 

This is why I thought that you can't go beyond 3200 MHz or above whatever AMD says under memory specification, and I choose slower kit instead, and for the same reason I work on timings now, but if this is true (I am no longer sure about that really), why some people still recomend getting faster kit and pair it with that CPU?

 

Please explain this to me

Thank you

Best Regards

 

[Radium_Angel]

20 minutes ago, kiki443 said:

RAM beyound what AMD says that perticular CPU supports?

Sure can, now whether it's stable or not, remains to be seen.

[rjd1991]

what ram is compatible with Ryzen 2700 And ASUS Rog b450 f Gaming Mobo

[kiki443]

3 hours ago, rjd1991 said:

what ram is compatible with Ryzen 2700 And ASUS Rog b450 f Gaming Mobo

check this out: https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_STRIX_B450_F_GAMING/Memory_QVL_AMD_Ryzen_2000_Series_Processors_B450_4DIMM.pdf

 

7 hours ago, Radium_Angel said:

Sure can, now whether it's stable or not, remains to be seen.

Ok, it might be stable, if I modify voltages a bit, however will it work since that memory specification thing that AMD says, I still don't see what that is and should I go beyond, or remain on 3200 and continue with timings?

[Haro]

3 hours ago, kiki443 said:

Ok, it might be stable, if I modify voltages a bit, however will it work since that memory specification thing that AMD says, I still don't see what that is and should I go beyond, or remain on 3200 and continue with timings?

Just letting you know the 2700 and infact all zen + cpu's don't have the best memory controller so you might if you won't the lottery be able to go to even higher speeds but it is unlikely 

[kiki443]

1 hour ago, TofuHaroto said:

Just letting you know the 2700 and infact all zen + cpu's don't have the best memory controller so you might if you won't the lottery be able to go to even higher speeds but it is unlikely 

I have 3600 Ryzen 5 (ZEN 2).

 

So I can go to higher speeds, but the question is, is it worth it?, should I leave it on 3200 and go with timings, now I have 14-8-8-16-21 from (XMP) 16-15-15-16-35, @ 1,37 v stable, should I further shrink timings or loose timings and go after higher frequencies?

[Haro]

28 minutes ago, kiki443 said:

I have 3600 Ryzen 5 (ZEN 2).

 

So I can go to higher speeds, but the question is, is it worth it?, should I leave it on 3200 and go with timings, now I have 14-8-8-16-21 from (XMP) 16-15-15-16-35, @ 1,37 v stable, should I further shrink timings or loose timings and go after higher frequencies?

Now what you need to know is that timings work kind of similar to freq (interms of ocing) so let's say you have a 3200mhz kit at cl 16 but let's say you get a looser timing at cl 15 but you you had to drop your freq to 3000 they will perform about the same (this is extremely simplified but should get the idea across)

[kiki443]

9 hours ago, TofuHaroto said:

Now what you need to know is that timings work kind of similar to freq (interms of ocing) so let's say you have a 3200mhz kit at cl 16 but let's say you get a looser timing at cl 15 but you you had to drop your freq to 3000 they will perform about the same (this is extremely simplified but should get the idea across)

I see, well I decided to go with timings, and experiment, I guess, to see whichever way is better.

 

Thank you for your help

[Haro]

8 hours ago, kiki443 said:

I see, well I decided to go with timings, and experiment, I guess, to see whichever way is better.

 

Thank you for your help

Your welcome