If there is any way to get 4000 working with your board/agesa/cpu then you should be able to run your existing kit on 4000c16. Would be surprised if that doesn't work.

cstkl1 need to rely on TristanX or possibly llk for that; I'm on a 5600x for now.

This post has been edited by nrw: Jan 2 2021, 06:01 PM

boards imho I'd rather get B550 over x570 unless you need those extra pcie4.0 lanes.
ram yeah... b-die or rev. e kits as mentioned. the rev e got to be imported.

currently I am still testing a cheap hynix djr kit. will share once I am done. this one works well after tweaking, not so sure though if it will work well out of the box with all boards.

beast921 what are your requirements for the board in terms of connectivity and do you plan to OC?

consider the b550 tomahawk (or the gaming edge wifi if you need wifi 6) or a step up the b550 gaming carbon wifi for the best vrm (excluding some boards that cost RM1.2k+)

all perfectly capable of powering your 5900x. even cheaper boards would be able to do that comfortably btw. it's just that the temps on those gonna be higher yet far from throttling.

irangan tag for DJR results.
https://forum.lowyat.net/index.php?showtopi...40&p=99504597&#

Just buy new 😅
I'll be keeping it n sell the rev e kit I was using. Easier to OC hence easier to assist ppl setting that up.

Just working on the second DJR kit I got, that one is a bit different. Will update my post in OC thread with results of that one by tomorrow night.

follow what Tristan said.

Technically the situation for DIMM's with 16Gbit IC's (which wiill be on 32GB DIMM's) is pretty easy.

There is
1) Hynix CMR
2) Micron Rev.B
3) Samsung A-Die
4) (SpecTek which is relabeled Micron Rev. B)

All of them are having little issues reaching speeds until 3800 on Ryzen. After that Hynix and Micron ones separate themselves from the Samsung ones.

If you wanna run XMP. Proceed like TristanX proposed.

If you wanna OC you can save a lot money by buying 2400/2666MT/s rated sticks and overclocking them. In that case however you want to make sure to have the same IC's on both sticks you buy.

Yup, cmr will behave similarly. Thanks for confirming.

DR 16Gbit (in 2x32GB or especially 4x32GB config) with CMR and Rev. B will hit the limit of the FCLK and even IMC first afaik.

Take a photo of the side of your ram sticks that has the sticker on it n post here

the first crashes u'll see from doing pbo2 wrong will be those in idle/low loads.

This post has been edited by nrw: Jan 11 2021, 02:04 PM

4.32 is Samsung C-Die

kx221005 shouldn't start dreaming.
last info in this by AMD's VP was by end of 2022

I think it's like that:
For regular vCore undervolting you supply less V(oltage) and the F(requency) of the V/F curve drops with it. It also applies the same offset to all frequencies.
For PBO2 you adjust the V of the V/F curve. The F stays where it is. Temps then drop and the chip can boost higher momentarily. It sets different offsets to frequencies.


You can also set different limits for all cores after having tested which core performs how well.
Fairly easy to do on an 5600x, but you might spend weeks on an 5950x until it's stable, haha.

That's because the annoying thing is that the offset you set is applied for ALL loads, lesser for high loads and more for low loads.
And for idle or low loads it's just too much. Which is where you probably saw your reboots as well.
Example: -1 equals to ~ -3 to -5 mV. Probably -3 on high frequencies and -5mV on lower frequencies. If you set -10 in the PBO2 menu it'll be -30 to -50mV.



If you have a golden chip maybe you can make it to -30 (90/150) and be fine throughout curve...
but chances are at some place of the curve it's not enough Voltage supplied and hence you get a reboot.

-30 for all cores is utopian anyways, most chips won't even boot into windows with that, let alone be all time stable.
He surely has a nice binned chip supplied by AMD (why do most reviewers just don't get that?) but likely it's not even stable for him on all steps of the V/F curve.

Like SSJBen pointed out, this guy does too many mistakes in his 'guides' cuz he doesn't really get into stuff before recording his videos.

Edited*: added AMD's public use graphs.
Edit2*: actually the boost clock override (up to +200MHz by AMD, up to +500MHz based on OEM) makes it much harder to have a stable system (with override of +200 or more) in combination with a PBO2 curve.
I bet everyone having a 5600x and having played with +200 & PBO2 or above can relate. It just doesn't work all that well.
If you want both, you have to settle for +50 or something much lower than +200MHz.

This post has been edited by nrw: Jan 20 2021, 01:47 PM

Bonchi if u r on b550/x570 u can also set pcie of ur gpu to 3.0.
that can fix quite some issues you've been describing as well.

AMD not the environment to confirm these kind of issues as zen3 launch came along with Ampere
On 3800 everything was OK though, no issues after a stable profile was made.
But I also play(ed) a very limited amount of games, so I wouldn't dare to say 100% no issues to be had.

very late reply... but did you set the scalar to any value? what exactly are the settings you set in the pbo menu in general?

If you want lower temps and better performance:

1) Set Scalar to Auto (which will hopefully be OFF with Gigabyte nowadays)
2) Consider setting the power limits to stock, not that you gain much performance there anyways
3) Consider to use CoreCycler to do a curve. But before you start with that, test without it to make sure your boost clock override is actually stable
https://github.com/sp00n/corecycler

maybe you wait until coming weekend though, still quite some bugs in that corecycler script. just read up on it. (don't have a vermeer myself at this time)

attached one other 4200 with DR. not mine but actually since early days there are already some being able to do 4200 synched. I even heard from dr b-dies doing this.


funny thing though is that this is not just a cpu issue apparently. I know ppl testing the same chip on different boards where on one board it maxes out on 1900 or before that and spews errors on >=1933 while just by changing the board n keeping other stuff it'll do 2000.

guess this needs some more testing of users to zero in on it as AMD doesn't seem to bother, at all.

as long as it drops to .9V thats fine. This is specified in the power plans. You could tune that down but you'd gain nothing as cores go to sleep anyways and a lower voltage would just decrease performance without any further benefits.

Make sure you run the windows default plan for zen3, got bios properly set up and got no tool controlling power plans and/or voltages like some infamous motherboard manufacturers tools love doing.

This post has been edited by nrw: Mar 13 2021, 11:32 AM