Zen 2 Owners Thread!

opethdisciple · 29 Jul 2019 at 15:08

Memory latency calculator here.

opethdisciple · 29 Jul 2019 at 15:10

So 3200MHz CL14 has a lower latency than 3600MHz CL16.

However with Ryzen 3000 the IF is tied to the speed of the ram.

So although the lower frequency has the lower latency it also has the lower IF clock.

Why is the 3600MHz CL16 8 Pack ram more expensive than the 3200MHz CL14 on OcUK?

Thoughts?

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That's what I think AMD where getting at with this. Because the latency between CL14 and CL16 is similar but the IF speed is higher for 3600MHz ram.

alec · 29 Jul 2019 at 15:15

Latency is usually down to chip type, frequency to binning. Ie most B-die will run at sub 45ns latency, but not all can sustain it through 3733-4000-4200.

Sin_Chase · 29 Jul 2019 at 16:32

Orange Nexus said:
If it is faster than 3600CL16, then it's good. You need that boost. Hard to get 3600 CL14 or there is no difference?

I can't use 3600 or above as it limits my 3900x boost clocks. I doubt my chips are good enough for 3600CL14 even if they are rated at 3600CL16.

I'm right on the limit of stability underclocking at 3533CL14.

Nerusy · 29 Jul 2019 at 21:37

Interesting obsevation: with 1003a bios on my MSI mobo I would get temps spiking and then go back to normality, so temp chart woud look like a bunch of triangular hats on the temp chart every couple of seconds. I falshed back to 1003 and that behaviour is gone, temps are stable now and rise or fall on a curve rather than a line with spikes.

Woodsta888 · 30 Jul 2019 at 10:10

Dunno what I've done to my 3800X but it just runs at base clock 3.9Ghz and no longer boosts to 4.4. It won't go to idle either. I have PBO enabled in the BIOS. It was boosting but since playing with RAM to get my 3600MhZ stuff to run at that speed it doesnt. Also doesnt boost if I load default values either. I'm n00b at memory OC'ing as always used XMP but my RAM is unstable at the XMP settings drawn from the sticks. Dunno what BIOS settings I need to change to get it back to boosting. Any ideas guys? My clock speed is stuck permanently at 3899Mhz. CPU-Z states that the multiplier is x39 but I cant find the multiplier option in my ASRock BIOS menu :confused:

opethdisciple · 30 Jul 2019 at 10:24

Woodsta888 said:
Dunno what I've done to my 3800X but it just runs at base clock 3.9Ghz and no longer boosts to 4.4. It won't go to idle either. I have PBO enabled in the BIOS. It was boosting but since playing with RAM to get my 3600MhZ stuff to run at that speed it doesnt. Also doesnt boost if I load default values either. I'm n00b at memory OC'ing as always used XMP but my RAM is unstable at the XMP settings drawn from the sticks. Dunno what BIOS settings I need to change to get it back to boosting. Any ideas guys? My clock speed is stuck permanently at 3899Mhz. CPU-Z states that the multiplier is x39 but I cant find the multiplier option in my ASRock BIOS menu

Could always restore default values in BIOS and try again.

Woodsta888 · 30 Jul 2019 at 11:03

opethdisciple said:
Could always restore default values in BIOS and try again.[/QUOTE

I did in the end start from scratch cheers. There is two places in the BIOS for entering all the DRAM timings etc and previously I used the settings under the OC menu but I found settings outside this which is the Primary timing settings. Pumped all the DRAM calcs into that so RAm is at 3600Mhz and it now boosts again to 4.5Ghz. Just need to test for stability again. Cheers

Orange Nexus · 30 Jul 2019 at 12:17

Sin_Chase said:
I can't use 3600 or above as it limits my 3900x boost clocks. I doubt my chips are good enough for 3600CL14 even if they are rated at 3600CL16.

I'm right on the limit of stability underclocking at 3533CL14.

Got a 3200 CL14 that i wish to oc to 3533 CL14 on GEN2. This kit does it on both GEN 1 and + but it was not any faster than 3466 CL14.

DragonQ · 30 Jul 2019 at 12:25

Woodsta888 said:
I did in the end start from scratch cheers. There is two places in the BIOS for entering all the DRAM timings etc and previously I used the settings under the OC menu but I found settings outside this which is the Primary timing settings. Pumped all the DRAM calcs into that so RAm is at 3600Mhz and it now boosts again to 4.5Ghz. Just need to test for stability again. Cheers

Hmm that's a good point, I wonder if setting memory speeds and timings via AMD's menu in the UEFI changes results compared to setting it via the standard motherboard manufacturer's menu?

Woodsta888 · 30 Jul 2019 at 12:53

DragonQ said:
Hmm that's a good point, I wonder if setting memory speeds and timings via AMD's menu in the UEFI changes results compared to setting it via the standard motherboard manufacturer's menu?

You using Ryzen Master to do all your adjustments, not ever going into your MOBO BIOS? I can't get this 3600Mhz RAM to run at it's specified speed stable. Gone are the days of XMP and off you go. Really annoying.

DragonQ · 30 Jul 2019 at 13:03

Woodsta888 said:
You using Ryzen Master to do all your adjustments, not ever going into your MOBO BIOS? I can't get this 3600Mhz RAM to run at it's specified speed stable. Gone are the days of XMP and off you go. Really annoying.

No, Ryzen Master is not what I mean. Within the UEFI there are two ways to modify the RAM speed and timings (at least on my board). The "standard" way is via the OC Tweaking tab. But you can also do it via the Advanced -> AMD CBS menu (can't remember exact names here). I always use the standard OC Tweaking tab method but I just wonder if results differ when using the other method.

I do not use Ryzen Master to change anything, only for monitoring.

Woodsta888 · 30 Jul 2019 at 13:28

DragonQ said:
No, Ryzen Master is not what I mean. Within the UEFI there are two ways to modify the RAM speed and timings (at least on my board). The "standard" way is via the OC Tweaking tab. But you can also do it via the Advanced -> AMD CBS menu (can't remember exact names here). I always use the standard OC Tweaking tab method but I just wonder if results differ when using the other method.

I do not use Ryzen Master to change anything, only for monitoring.

Ah right, yes I know the tabs you mean. I noticed that after applying the settings in the OC tweaking tab (we both have ASRock) some of the variables don't port across to the advanced section which has further parameters available under the AMD Overclocking section. So some of the parameters entered in the OC tweak are still on default or auto when I go into the memory settings under the advanced menu. Certainly tFAW and tRFC under the advanced tabs were not what I'd entered, saved and applied underthe OC tweak menu.

DragonQ · 30 Jul 2019 at 13:33

Woodsta888 said:
Ah right, yes I know the tabs you mean. I noticed that after applying the settings in the OC tweaking tab (we both have ASRock) some of the variables don't port across to the advanced section which has further parameters available under the AMD Overclocking section. So some of the parameters entered in the OC tweak are still on default or auto when I go into the memory settings under the advanced menu. Certainly tFAW and tRFC under the advanced tabs were not what I'd entered, saved and applied underthe OC tweak menu.

Heh that's interesting as I've had issues with tRFC for sure. I didn't know any of the settings actually migrated from one menu to another though, I'll have to look into that.

EDIT: Hmm, they all seem to match on my system. Note that some values are in hex in AMD CBS menu but decimal in the OC Tweaker menu.

Managed to get 3266 MT/s stable with the same timings and voltage (1.35 V) I was using for 3200 MT/s. Yet setting it to 3333 MT/s (even at 1.4-1.45 V) always crashes during POST or Windows loading. I still don't believe the kit's stability is that precarious!

I think what I might try next is leaving the IF at 1600 MHz whilst setting the RAM to 3333 MT/s. That should tell me if the IF or RAM is struggling at 1666 MHz.

Alan1969 · 30 Jul 2019 at 21:58

3600
team group dark pro 8 pack 16bg 3200 (from OcUk)
b450 auros pro ITX (bios flashed by the supplier for free)
Silverstone raven ITX case (this case will fit my sapphire nitro fury)
140mm seasonic ATX gold

https://alansmith-photography.smugmug.com/My-First-Gallery/i-CgxGTNv

why doesn't the photo display?

Sin_Chase · 31 Jul 2019 at 00:07

Alan1969 said:
3600
team group dark pro 8 pack 16bg 3200 (from OcUk)
b450 auros pro ITX (bios flashed by the supplier for free)
Silverstone raven ITX case (this case will fit my sapphire nitro fury)
140mm seasonic ATX gold

https://alansmith-photography.smugmug.com/My-First-Gallery/i-CgxGTNv

why doesn't the photo display?

You need to link to the actual file with it's proper extension.

bro306 · 31 Jul 2019 at 13:56

4.4Ghz 1.375v 3800Mhz 14-16-16-28-78 UFclk1900mhz Fclk1900mhz
Loving my 3900x on Msi x570 meg.

Woodsta888 · 31 Jul 2019 at 14:01

^^ Had me scrabbling for my glasses then - they were on my face.

Phil Smith · 31 Jul 2019 at 14:53

Sin_Chase said:
I can't use 3600 or above as it limits my 3900x boost clocks..

THANK YOU! You've inadvertently solved a massive headache I was having. My boost clocks weren't behaving at all as expected until I saw this by chance.

Sin_Chase · 31 Jul 2019 at 17:16

Phil Smith said:
THANK YOU! You've inadvertently solved a massive headache I was having. My boost clocks weren't behaving at all as expected until I saw this by chance.

Yeah it's....odd behaviour.

Apparently Gigabyte can reproduce it on their boards but don't think it's limited to them as a vendor. Hopefully a fix in the works.