Ryzen 3900X thread

arc@css · 24 Oct 2019 at 17:09

MartinPrince said:
I looked in the thread here and know how to use Dram calculator but I haven't even done any major tweaking yet. All I did was to up the memory voltage and change it from 3200Mhz to 3600Mhz in the bios and then just did some testing. That's it.

Initially I entered the required fields in the Dram calculator but then struggled to locate a number of the settings in the bios, hence me starting off with just XMP. I'll test things a bit later today.

MartinPrince · 24 Oct 2019 at 20:01

arc@css said:
Initially I entered the required fields in the Dram calculator but then struggled to locate a number of the settings in the bios, hence me starting off with just XMP. I'll test things a bit later today.

Yes, just leave timings as they are and see if you can run 3600Mhz so that the Infinity Fabric runs at 1800Mhz. Up to 1.45v on the mem is fine.

Illuminist · 25 Oct 2019 at 14:23

Just used rám calculator again to get my ram back to 3600.
Entered everything in the bios manually

Is there any reason that it changed my timings from 15,15,15 to 16,16,16 automatically?

Brazo · 25 Oct 2019 at 15:26

Illuminist said:
Just used rám calculator again to get my ram back to 3600.
Entered everything in the bios manually

Is there any reason that it changed my timings from 15,15,15 to 16,16,16 automatically?

Yes. Ryzen needs even not odd ram timings

Yaayuh! · 25 Oct 2019 at 16:19

Illuminist said:
Just used rám calculator again to get my ram back to 3600.
Entered everything in the bios manually

Is there any reason that it changed my timings from 15,15,15 to 16,16,16 automatically?

Geardown mode enabled?

Woodsta888 · 25 Oct 2019 at 16:26

Brazo said:
Yes. Ryzen needs even not odd ram timings

Really? Wouldn't the newest DRAM calc do that if it was so?

Genuine question - I've just not picked that up if it's well known.

Illuminist · 25 Oct 2019 at 16:32

Brazo said:
Yes. Ryzen needs even not odd ram timings

That's not true I've had 15,16,16,16 timings before, also see the settings in ram calc below that I entered

Rossi~ said:
Geardown mode enabled?

Geardown is disabled as ram calc instructed.
Like this

It set it all perfectly apart from the main timings it changed to 16,16,16,16 in Windows. All the rest are as above

arc@css · 25 Oct 2019 at 20:29

MartinPrince said:
Yes, just leave timings as they are and see if you can run 3600Mhz so that the Infinity Fabric runs at 1800Mhz. Up to 1.45v on the mem is fine.

Thanks. So, am I correct in assuming that I should go into the bios and set the memory multiplier to 36.00? I think auto was at 24.00.

MartinPrince · 25 Oct 2019 at 22:12

arc@css said:
Thanks. So, am I correct in assuming that I should go into the bios and set the memory multiplier to 36.00? I think auto was at 24.00.

Yes, If you're at XMP (DOCP) then it will be at 32 but without it will be less. Also set the Dram voltage to 1.45v or it will probably fail to boot and you may have to reset the CMOS etc.

Illuminist · 25 Oct 2019 at 22:32

Any ideas on my problem.?

arc@css · 25 Oct 2019 at 23:01

MartinPrince said:
Yes, If you're at XMP (DOCP) then it will be at 32 but without it will be less. Also set the Dram voltage to 1.45v or it will probably fail to boot and you may have to reset the CMOS etc.

Yes, I remember it being at 32 for the XMP profile, so I disabled that and manually set it to 36. I must admit I didn't adjust the voltage but the system booted up ok. I then recorded some gameplay for a couple of hours with no apparent issues.

MartinPrince · 26 Oct 2019 at 00:25

arc@css said:
Yes, I remember it being at 32 for the XMP profile, so I disabled that and manually set it to 36. I must admit I didn't adjust the voltage but the system booted up ok. I then recorded some gameplay for a couple of hours with no apparent issues.

Excellent. Though folks normally recommend running Memtest to make sure the memory is fully stable. I'm in the process of lowering my voltage so I test for stability then lower the voltage a little more until I get errors.

arc@css · 26 Oct 2019 at 13:53

Rendered a video with no problems.

This thing renders videos about 3-4 times faster than my 6600k ever could. Blitzes through it!

Btw, will any alcohol wipes do for cleaning off old thermal paste? I've already used the one I had for sorting out my previous CPU.

arc@css · 28 Oct 2019 at 14:39

MartinPrince said:
Excellent. Though folks normally recommend running Memtest to make sure the memory is fully stable. I'm in the process of lowering my voltage so I test for stability then lower the voltage a little more until I get errors.

It let me know it wasn't quite happy with, I presume the amount of voltage, so just for the mo, I set it to XMP again.

Just to clarify, is this the correct setting I should be changing to adjust the memory voltage? Cheers.

MartinPrince · 29 Oct 2019 at 02:42

arc@css said:
It let me know it wasn't quite happy with, I presume the amount of voltage, so just for the mo, I set it to XMP again.

Just to clarify, is this the correct setting I should be changing to adjust the memory voltage? Cheers.

Yes that's the memory voltage setting though it is not the voltage it will complain about if keeping it to 1.45 and below, it will be the timings that it won't like.

arc@css · 29 Oct 2019 at 09:57

MartinPrince said:
Yes that's the memory voltage setting though it is not the voltage it will complain about if keeping it to 1.45 and below, it will be the timings that it won't like.

Thanks, Martin. I've set it to 1.365 (or 1.360, can't remember) which was recommended in the calculator. If there's a problem, I'll apply the DRAM timings as well.

Illuminist · 30 Oct 2019 at 08:55

So im looking in getting some very fast ram in hopes that I can then lower the speed and have tight timings.
Something like the geil 4133, or gskill 4000, or patriot viper 4400.

Anyone help with some advice on this for zen 2?
Would ideally like to run it at 3800/3600mhz and as tight timings as possible.

Yaayuh! · 30 Oct 2019 at 08:59

Illuminist said:
So im looking in getting some very fast ram in hopes that I can then lower the speed and have tight timings.
Something like the geil 4133, or gskill 4000, or patriot viper 4400.

Anyone help with some advice on this for zen 2?
Would ideally like to run it at 3800/3600mhz and as tight timings as possible.

Higher rated frequency doesn't mean it'll be tighter at lower frequency compared to say decent 3600MHz CL16. For instance, I have G.Skill F4-4000C18D-16GTZSW (4000MHz CL18) and it's timings are worse than what 3200MHz CL14 can do at 3600-3800MHz.

I would just go for some decent 3600MHz CL16 or 3866MHz CL18

Edit: Just noticed you already have some... lol

Illuminist · 30 Oct 2019 at 09:18

Rossi~ said:
Higher rated frequency doesn't mean it'll be tighter at lower frequency compared to say decent 3600MHz CL16. For instance, I have G.Skill F4-4000C18D-16GTZSW (4000MHz CL18) and it's timings are worse than what 3200MHz CL14 can do at 3600-3800MHz.

I would just go for some decent 3600MHz CL16 or 3866MHz CL18

Edit: Just noticed you already have some... lol

My ram would be better than those i mentioned at 3800?
I haven't tried 3800 on my ram with loose timing yet, I tried the ram calc settings for it but it didn't want to boot. So I'm back to 3600 cl16.

Yaayuh! · 30 Oct 2019 at 09:23

Illuminist said:
My ram would be better than those i mentioned at 3800?
I haven't tried 3800 on my ram with loose timing yet, I tried the ram calc settings for it but it didn't want to boot. So I'm back to 3600 cl16.

Likely going to be similar, but not massively better. They're just screened for frequency at a high voltage (1.45v+)