**AMD 9950X3D Owners Club**

[djay]

I have set it to -20 on both CCD's and been using the PC most of the day and it seems fine. Will try some more tomorrow.

 

[LtMatt]

I have set it to -20 on both CCD's and been using the PC most of the day and it seems fine. Will try some more tomorrow.

Rule of thumb. The frequency CCD will generally accept lower CO than the cache CCD, due to the 200Mhz higher boost clock when using PBO.

 

[The Asgard]

Anyone running 2x 48GB of RAM successfully at 6400C32
I’m thinking of upgrading.

Specifically looking at these

G.SKILL Trident Z5 RGB Series (Intel XMP 3.0) DDR5 RAM 96GB (2x48GB) 6400MT/s CL32-39-39-102 1.35V Desktop Computer Memory UDIMM - Matte Black (F5-6400J3239F48GX2-TZ5RK)​

 

[djay]

Set both CCD to -30 and have been using PC all day. Not run any heavy stability tests, just been playing games all day, sorry I mean WFH

 

[LtMatt]

Set both CCD to -30 and have been using PC all day. Not run any heavy stability tests, just been playing games all day, sorry I mean WFH

Decent if you can run -30 ok the frequency CCD and not have stability issues.

 

[Jamin280672]

Can someone tell me how these are labelled in the bios please as they dont seem to refer to anything obvious really in an ASUS bios, I would like to change these settings to see if I can get my ram more stable at higher freq's.

Also, changing anything in the ASUS Tweaker / DRAM Menu to do with ProcOdt CS or CK etc etc causes an instant lockup whilst trying to save and exit, the only way I seem to be able to adjust is in the AMD Overclocking menu.

 

[Locky]

I've done away with curve optimiser, and solely tweaked curve shaper instead

Managed to get even more from this chip, and still be stable under Aida, ycruncher and gaming etc.

Good thing about it, you don't have to touch the idle bins, so no silly desktop crashing.

Also don't have to increase low frequency bins, so idle temps and wattage is lower (mine idles at 29w)

 

[LtMatt]

I've done away with curve optimiser, and solely tweaked curve shaper instead

Managed to get even more from this chip, and still be stable under Aida, ycruncher and gaming etc.

Good thing about it, you don't have to touch the idle bins, so no silly desktop crashing.

Also don't have to increase low frequency bins, so idle temps and wattage is lower (mine idles at 29w)

Running CO only here. Luckily this sample I am using does not have idle issues with a deep CO setting on each CCD. It is unusual to get a frequency CCD that will accept -30.

Idling at 22W here with my max PBO overclock.

 

[Locky]

Running CO only here. Luckily this sample I am using does not have idle issues with a deep CO setting on each CCD. It is unusual to get a frequency CCD that will accept -30.

Idling at 22W here with my max PBO overclock.

You have a golden one.. I can run -30 CCD1 and -25 CCD2 on this one

plus this motherboard is soooo limited compared to the Asus..

 

[LtMatt]

You have a golden one.. I can run -30 CCD1 and -25 CCD2 on this one

plus this motherboard is soooo limited compared to the Asus..

-25 is pretty good if thats stable under load and at idle. -30 is rare. -15 - 20 is most common for CCD1.

 

[torwak]

You have a golden one.. I can run -30 CCD1 and -25 CCD2 on this one

plus this motherboard is soooo limited compared to the Asus..

Delid your CPU, get a MORA VI 600 sitting next to window (water temp 5C). You will also have a golden sample CPU.

 

[Locky]

Delid your CPU, get a MORA VI 600 sitting next to window (water temp 5C). You will also have a golden sample CPU.

cba with deliding..

-25 is pretty good if thats stable under load and at idle. -30 is rare. -15 - 20 is most common for CCD1.

yeah its was solid at CCD1 30 and CCD2 25 ran aida for ages, did loads of gaming and video editing.
it's even better just using curve shaper!

I think you can make a bad chip half decent with some time and skill - tweaking cores 1 by 1..

 

[torwak]

cba with deliding..

This is the way. Don't forget about the external radiators.

 

[Locky]

This is the way. Don't forget about the external radiators.

I'm already running 3x 360 rads (50mm)

 

[LtMatt]

Further refinement of my tune with the highest ever Karhu output I've achieved so far at 8200C34 at 1.64 VDD and 1.45 VDDQ.

Spoiler

 

[McCarthy]

Further refinement of my tune with the highest ever Karhu output I've achieved so far at 8200C34 at 1.64 VDD and 1.45 VDDQ.

Spoiler

One day I will get lucky with a great CPU like this.

I’m surprised you’re able to test in this heat!

 

[LtMatt]

One day I will get lucky with a great CPU like this.

I’m surprised you’re able to test in this heat!

Not so much the CPU tbf, more the motherboard (1 DPC) doing the heavy lifting.

Life in the trenches...

Spoiler

Yes I need a fan when running a true RAM Test like Karhu to stop the memory hitting higher temps which causes a failure. Games don't stress memory at all so temps not a concern there.

Most 9950X3Ds I've tried did 8200 without issue except for one, that had the strongest cache cores I've ever encountered. That one is now owned by @GoRedwings19.

 

[Jamin280672]

Not so much the CPU tbf, more the motherboard (1 DPC) doing the heavy lifting.

Life in the trenches...

Spoiler

Yes I need a fan when running a true RAM Test like Karhu to stop the memory hitting higher temps which causes a failure. Games don't stress memory at all so temps not a concern there.

Most 9950X3Ds I've tried did 8200 without issue except for one, that had the strongest cache cores I've ever encountered. That one is now owned by @GoRedwings19.

It is the CPU mate, my 9950X3D wont do anymore than 8000 CL34 no matter how much voltage I whack through the ram or IMC, cant do 8100 or 8200 let alone 8400, this is with the CPU and RAM under water, and on a Gene, I got a crap IMC in mine, wont do anymore than 2167 FCLK either, I need 1.25v SOC to keep what ive got stable too, the cores are pretty good though with an SP of 121.

 

[LtMatt]

It is the CPU mate, my 9950X3D wont do anymore than 8000 CL34 no matter how much voltage I whack through the ram or IMC, cant do 8100 or 8200 let alone 8400, this is with the CPU and RAM under water, and on a Gene, I got a crap IMC in mine, wont do anymore than 2167 FCLK either, I need 1.25v SOC to keep what ive got stable too, the cores are pretty good though with an SP of 121.

Fair enough. I've had around 8x 9950X3Ds now so a decent sample dize, just the one couldn't do it (8200Mhz and 2200Mhz FCLK) with custom voltages and resistances. Two of the samples also did 2233Mhz FCLK. Maybe you got unlucky, or maybe yours needs more fine tuning. Sometimes you have to adjust the resistance values from default in order to go above 8000Mhz I found.

FCLK can't really be helped outside of bumping SOC voltage. Your sample will either do it or it won't at a reasonable voltage. Also, in 1:2 mode, too high a SOC voltage can cause its own stability problems. Rule of thumb, 1:1 mode higher SOC and VDDP, 1:2 mode, lower SOC voltage and VDDP. Funnily enough, the sample I sold @GoRedwings19 was limited to 2167 FCLK too same as yours, that one also couldn't manage 8200Mhz and I put weeks into trying to make it work. The rest I got working at 8200Mhz within an hour. Sometimes its just luck of the draw.

 

[Jamin280672]

Fair enough. I've had around 8x 9950X3Ds now so a decent sample dize, just the one couldn't do it (8200Mhz and 2200Mhz FCLK) with custom voltages and resistances. Two of the samples also did 2233Mhz FCLK. Maybe you got unlucky, or maybe yours needs more fine tuning. Sometimes you have to adjust the resistance values from default in order to go above 8000Mhz I found.

FCLK can't really be helped outside of bumping SOC voltage. Your sample will either do it or it won't at a reasonable voltage. Also, in 1:2 mode, too high a SOC voltage can cause its own stability problems. Rule of thumb, 1:1 mode higher SOC and VDDP, 1:2 mode, lower SOC voltage and VDDP. Funnily enough, the sample I sold @GoRedwings19 was limited to 2167 FCLK too same as yours, that one also couldn't manage 8200Mhz and I put weeks into trying to make it work. The rest I got working at 8200Mhz within an hour. Sometimes its just luck of the draw.

Yeah silicon lottery for you, like I say though, the cores are pretty good in this one, the 3D cores are boosting to 5750 and the freq cores to 5950 with an FMAX boost override of +200 and LLC lvl 8, curves are currently -25 on 3D cores and -15 on Freq cores, tested and stable, im still working on those though.

Its just a shame really that AMD opted to use the same IO Die as 7000 series, I went through about 5 or 6 7950X3Ds before I got a decent one.