3950x OC

[∀Z‾soʇɐuɐɥ┴]

So I am playing around with OC'ing my 3950x.
Highest I can get with temps that keep me happy is 4.2ghz on all cores while at 1.35v static.
Upping voltage to 1.375 allows me to hit 4.3ghz on all cores, but increases my max temps from 75c to 80c which I am not happy with 100%.
Also based on the extreme OC'ers which only got 4.3ghz out of the 3950x anyway on liquid (not looking at LN2 now) I would say my 4.2ghz @ 1.35v with a max temp of 75c is not bad.
Also seeing as for some reason with default settings my CPU was only turbo-ing to 4.2ghz on some cores anyway rather than 4.5ghz as it 'should?' this is no real loss.

Idle temps are at 40-43c while ambient is kept at 24c.

This might change with a rebuild I am doing tomorrow as I am changing loop layout and installing a different pump + distro board to do away with pump/res combo I am currently using (though I dont think this will affect things much).

Does anyone else have some other insight into OC'ing a 3950x that I might have missed?
I am just playing with CPU VCore Voltage and CPU Clock Ratio at this point.
No clue what the other voltages do or are supposed to do.

 

[Valheru]

@VPII played with one IIRC

 

[Valheru]

Here is some info:

Asus X570 I Gaming, 3950X and G-Skill 3600 CL16-19-19-39 C-Die | Overclocking

Hey guys I need some help getting this setup to its optimum, I would like to tighten the RAM timings as well as get the CPU to a solid and permanent OC of around 4.2ghz under full load. CPU is running under a Kraken X63 so cooling should be sufficient. PSU is a Corsair RM850 What I have done...

carbonite.co.za

 

[∀Z‾soʇɐuɐɥ┴]

Here is some info:

Asus X570 I Gaming, 3950X and G-Skill 3600 CL16-19-19-39 C-Die | Overclocking

Hey guys I need some help getting this setup to its optimum, I would like to tighten the RAM timings as well as get the CPU to a solid and permanent OC of around 4.2ghz under full load. CPU is running under a Kraken X63 so cooling should be sufficient. PSU is a Corsair RM850 What I have done...

carbonite.co.za

Thanks, actually quite interesting he was able to hit 4.2 at <1.2v while mine just crashes as soon as I drop below 1.35v at 4.2ghz. with everything else set to defaults.

 

[Valheru]

Thanks, actually quite interesting he was able to hit 4.2 at <1.2v while mine just crashes as soon as I drop below 1.35v at 4.2ghz. with everything else set to defaults.

Can't find the other thread right now, maybe he can add some info to help. Don't know if is good or bad, so can't help there.

 

[∀Z‾soʇɐuɐɥ┴]

Ok scratch that.
Looks like with me now being able to enable XMP I can drop the CPU VCore voltage lower than 1.35
Let me play around and see how low I can go.
Yay voltage limbo here we come

 

[AinsleyHarriott]

Identify your best cores and push them to the max!

Also, the software featured on LTT is releasing soon, so that might help too.

 

[∀Z‾soʇɐuɐɥ┴]

Just dropping voltage from 1.35 to 1.3475 gives me a 2-3degree drop in max temp while running cinebench
(yes I know this is not a 100% legit stress test, but atleast it crashes before pc does if voltage is unstable)

 

[∀Z‾soʇɐuɐɥ┴]

Identify your best cores and push them to the max!

Also, the software featured on LTT is releasing soon, so that might help too.

Yep waiting for this, but I would like to see what I can get before running a software which says 'this is the best and thats it'...

 

[AinsleyHarriott]

I would like to see what I can get before running a software which says 'this is the best and thats it'

Agreed. I usually use the software as a baseline and then tweak from there though...

I have a 3200G so probably a major difference

 

[Dirtdiver]

Got mine 4.250 GHz at 1.290. Temps are similar, on a Gigabyte gaming x motherboard, nothing fancy These chips all very similar. Don't think it can go higher on normal cooling? What cooling do you use?

I didn't do any extreme stress test. Just Cinebench and Prime 95. Usually work on Adobe and I don't get any crashes. Unless I go any further than 4.3ghz, then my voltage needs to go up and temps. And alot of blue screens.

 

[∀Z‾soʇɐuɐɥ┴]

Got mine 4.250 GHz at 1.290. Temps are similar, on a Gigabyte gaming x motherboard, nothing fancy These chips all very similar. Don't think it can go higher on normal cooling? What cooling do you use?

I didn't do any extreme stress test. Just Cinebench and Prime 95. Usually work on Adobe and I don't get any crashes. Unless I go any further than 4.3ghz, then my voltage needs to go up and temps. And alot of blue screens.

Im running a custom loop, but yea, can get it up to 4.3ghz at 1.35v (didn't test it on lower voltages)
But even at 1.375v anything above 4.3ghz just crashes pc instantly so safe to say 4.3ghz is probably the highest with some advanced tweaking.
(note this is not a temp crash but a hard almost bsod like crash, screen just locks up and pc shuts down and reboots)

 

[∀Z‾soʇɐuɐɥ┴]

so voltage dropped from 1.35v to 1.3v now already and its running without crashes/drops.
max temp during cinebench is no 70c down from 75c, so heavy fan curve doesn't even kick in now and pc stays nice and quiet.

 

[Dirtdiver]

I was thinking of going water cooling. But it seems the gains are minimal but I'm thinking right now,, for longer renders might be beneficial.

Right now it's under a Phanteks 120mm cooler. I'm looking out for a Dark Rock Pro or Noctua d15. But water cooling is something I did before and like,, but yes not sure if makes sense to do. But we PC guys don't make sense. 🤭

 

[∀Z‾soʇɐuɐɥ┴]

So Cinebench crashed at 1.2125v but runs stable at 1.21875v @ 4.2ghz no crashes/errors and a 65c max temp

 

[∀Z‾soʇɐuɐɥ┴]

Ok scratch that. Seems for some reason when I run cinebench my vcore voltage drops to 1.125v and below causing it to crash.
This even with my voltage set to a static 1.225v
Any ideas why the voltage still drops like this? Or is it purely cpu load = voltage drop?

 

[AinsleyHarriott]

Ok scratch that. Seems for some reason when I run cinebench my vcore voltage drops to 1.125v and below causing it to crash.
This even with my voltage set to a static 1.225v
Any ideas why the voltage still drops like this? Or is it purely cpu load = voltage drop?

Are you using BIOS or Ryzen Master?

 

[∀Z‾soʇɐuɐɥ┴]

Are you using BIOS or Ryzen Master?

EasyTune from Gigabyte to find stable clocks before setting them in bios.
It's quicker than setting bios, hope it boots, and then running tests, just to reboot and do again.
Also I don't understand ryzen master so I don't touch it.

 

[Dirtdiver]

Ok scratch that. Seems for some reason when I run cinebench my vcore voltage drops to 1.125v and below causing it to crash.
This even with my voltage set to a static 1.225v
Any ideas why the voltage still drops like this? Or is it purely cpu load = voltage drop?

There is a setting for this,, I didn't dive deep into mine yet,, so what do is I find it where it boots and runs fine BUT crashes on load and just add 0.0020 or so. I'm not an OC guru,, just basic. So it survives on load🤭

 

[∀Z‾soʇɐuɐɥ┴]

There is a setting for this,, I didn't dive deep into mine yet,, so what do is I find it where it boots and runs fine BUT crashes on load and just add 0.0020 or so. I'm not an OC guru,, just basic. So it survives on load🤭

pretty much what I am doing with running cinebench as pc still runs fine, but that crashes when voltage droops too low so works as a good indicator imo.. or atleast so I think..
Also no where near being a OC guru... last time I did any meaningful OC it was on my e5200 which I OC'd to run at 5.2ghz back in like 2011.

 

[AinsleyHarriott]

EasyTune from Gigabyte to find stable clocks before setting them in bios.
It's quicker than setting bios, hope it boots, and then running tests, just to reboot and do again.
Also I don't understand ryzen master so I don't touch it.

Ryzen Master is very easy to use. It also shows your best cores.

 

[∀Z‾soʇɐuɐɥ┴]

For now voltage droop seems to only drop till about 1.131v which is above 1.125v and cinebench is happy.
Im on 4.2ghz at 65c max so I am happy as well

Thanks for the original link @Valheru , this enabled me to realise lower voltage is in fact possible with xmp enabled, and seeing as I could enable XMP for the first time today since i got the board (thanks speshul ram) I didn't think to retest my OC settings

 

[Dirtdiver]

Ryzen Master is very easy to use. It also shows your best cores.

I wish Ryzen Master loaded the profile or somehow saves it too your bios. But I really like RM.

 

[∀Z‾soʇɐuɐɥ┴]

Ryzen Master is very easy to use. It also shows your best cores.

best cores don't really mean much to me tbh.
im quite serious when I say it doesn't tell me what the core is capable of doing etc.
I basically just have no idea what to do with all the information it does give.

 

[Dirtdiver]

For now voltage droop seems to only drop till about 1.131v which is above 1.125v and cinebench is happy.
Im on 4.2ghz at 65c max so I am happy as well

Thanks for the original link @Valheru , this enabled me to realise lower voltage is in fact possible with xmp enabled, and seeing as I could enable XMP for the first time today since i got the board (thanks speshul ram) I didn't think to retest my OC settings

That's a good OC. Run a stress test and see if it holds. When I went that low,, it works but randomly crashes.

 

[Dirtdiver]

@ThanaToeter_ZA what Motherboard and Ram are you using?

 

[AinsleyHarriott]

@ThanaToeter_ZA what Motherboard and Ram are you using?

The best ones... I'm jealous.

X570 Aorus Xtreme and 64GB Trident-Z RGB @3200.

 

[∀Z‾soʇɐuɐɥ┴]

So final update (for now I reckon).
CPU @ 4.2ghz - 1.225v
Idle temp = 35-46c
Max temp during Cinebench - 62.9c
Much better than my idle of 40c and max of 80c I was hitting before.

But yea @Dirtdiver I'm running a X570 Aorus Xtreme board with Trident Z RGB CL16 3200mhz ram

 

[AinsleyHarriott]

Idle temp = 35-46c
Max temp during Cinebench - 62.9c
Much better than my idle of 40c and max of 80c I was hitting before.

What's your room temperature?

 

[Dirtdiver]

On this topic of OC. This is what I did the other day. I'm using Teamgroup Delta 32 gig 3200mhz. C die as per the software.

So I clocked this too 3600mhz and used dram calculator. Well I need to list the exact timings,,, but one of the numbers went up by one from the original. So my timings are not are not great, lol. But it's stable on 3600mhz with he OC and my cinebench score went up by 100.

I don't know how beneficial this is,, I dnt see a difference but everyone says go 3600mhz. 🤣🤣. Well it's working and in my mind im .happy

Edit

This my ram timings CL16-18-18-38

After OC it went up..