Question Zen 4 builders thread

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Golgatha

Lifer
Jul 18, 2003
12,678
1,590
126
Got this (see signature) PC tweaked. I've set the curve optimizer to -15, max socket wattage set to 120w. 120w matches up nicely with the capacity of my Noctua air cooler. ASUS auto OC is set to ON and it will single thread boost upwards of 5.9-6Ghz with temps in the mid-50°C range. Multi-thread it will sustain about 5.2Ghz and reach about 81°C. RAM is set to EXPO II running at CL36@6000Mhz. I'm quite happy with how this build turned out.

Cliffs:
CBR23 ran 2007 and 19950 for single and multithread.
3DMark Time Spy stress test was 99.5% for stability.

Power settings are PPT 120, TDC 95, and EDC 150.
Curve Optimizer set to -15 on all cores.
Expo II auto settings of CL36@6000 Mhz for the RAM.
ASUS Auto OC set to enabled.

 
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In2Photos

Golden Member
Mar 21, 2007
1,665
1,682
136
Got this (see signature) PC tweaked. I've set the curve optimizer to -20, max socket wattage set to 120w. 120w matches up nicely with the capacity of my Noctua air cooler. ASUS auto OC is set to ON and it will single thread boost upwards of 5.9-6Ghz with temps in the mid-50°C range. Multi-thread it will sustain about 5.2Ghz and reach about 86°C. RAM is set to EXPO II running at CL36@6000Mhz. I'm quite happy with how this build turned out.

View attachment 79459
Nice! What are your CBR23 scores?
 

pj-

Senior member
May 5, 2015
481
249
116
Quick update.. After 4 hours to rip everything apart and put the Aorus Master in, and an additional 90 mins of tense troubleshooting the GPU not being detected, things are back up and running again.

Hasn't been enough time to fully conclude that the Asus was the problem but performance is as expected with PBO and EXPO and things are looking good after about 2 hours, which I think is about as long as I ever continuously used it with the Asus.

One odd thing I noticed is that the ssd runs substantially cooler on the gigabyte board. Like 40c vs 69c. The heatsink is substantially larger on the gigabyte and there are thermal pads on both sides of the drive but still more of a difference than I'd expect.

Two crashes today in about 8 hours of mostly idle use

Will likely exchange the CPU but I contacted AMD support for now to see if they have any ideas
 

H433x0n

Golden Member
Mar 15, 2023
1,066
1,247
96
Two crashes today in about 8 hours of mostly idle use

Will likely exchange the CPU but I contacted AMD support for now to see if they have any ideas
Exchange it, it's not worth the hassle to continue trying to sort it out. Even if it did get sorted out, it seems your particular CPU is right at the edge of stability with the V/F curve and I don't know how much newer BIOS revisions would help that since there's a lot of reluctance to increasing voltage on the vache CPUs. I wouldn't of even gone as far as to change the motherboard personally.

From what I've been told AMD is pretty good about exchanging 7950X3D CPUs for customers that are having trouble.
 

MarkPost

Senior member
Mar 1, 2017
239
345
136
Yeah I was using PBO, disabled it after the second crash. At around 4 hours between crashes it's going to take a while to come to any conclusion
lets see first if system is stable at stock. Anyway you need to know that with a PBO with a -20 all core is very VERY possible that some of the cores are not stable specially at idle ((for example, its very likely that the preferred cores need lower curve value because they go to clocks too high). So you need to test each core individually to check at which curve value its stable. Some may be stable at -25, but others may need -20, or -15, or -10, or -5... or whatever.

CoreCycler is a good start to check it.
 

pj-

Senior member
May 5, 2015
481
249
116
lets see first if system is stable at stock. Anyway you need to know that with a PBO with a -20 all core is very VERY possible that some of the cores are not stable specially at idle ((for example, its very likely that the preferred cores need lower curve value because they go to clocks too high). So you need to test each core individually to check at which curve value its stable. Some may be stable at -25, but others may need -20, or -15, or -10, or -5... or whatever.

CoreCycler is a good start to check it.

PBO has been disabled for a couple hours and it's crashed 3 times. If anything it seems less stable with it off.. Gonna turn it back on with -10 all core and try some gaming tonight.

I'm going to give AMD support a chance to respond to my ticket, more out of curiosity than anything. 99% chance I will end up just exchanging it at microcenter this weekend.
 

A///

Diamond Member
Feb 24, 2017
4,352
3,155
136
Wow sorry to hear that, PJ. I would bypass the AMD support and exchange the processor even though it means a long drive but that's me. shooting in the dark here but you may be more nstable without pbo because the voltage is dropping lower than the chip needs to operate since its flawed to begin with?
 

MarkPost

Senior member
Mar 1, 2017
239
345
136
PBO has been disabled for a couple hours and it's crashed 3 times. If anything it seems less stable with it off.. Gonna turn it back on with -10 all core and try some gaming tonight.

I'm going to give AMD support a chance to respond to my ticket, more out of curiosity than anything. 99% chance I will end up just exchanging it at microcenter this weekend.
I see. Have you checked memory stability?
 

IEC

Elite Member
Super Moderator
Jun 10, 2004
14,354
5,012
136
Using curve optimizer with a -10 offset is undervolting. Yes, you need to check memory stability but the sporadic crashing is highly likely due to inadequate voltage for 1T/2T boost frequencies...
 
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pj-

Senior member
May 5, 2015
481
249
116
Using curve optimizer with a -10 offset is undervolting. Yes, you need to check memory stability but the sporadic crashing is highly likely due to inadequate voltage for 1T/2T boost frequencies...

Yes, I turned PBO back on last night after receiving 3 crashes in a relatively short time with PBO disabled. Most of the crashes I've observed were with PBO off and the CPU running completely stock.

I gamed for a couple of hours without any issues last night so it does seem to be related to light loads, regardless of PBO settings.

Edit: Decided to just replace it. The one company I'm most pleased with in this process is microcenter. No problems returning the asus board and exchanging the cpu. Replacement CPU is installed and I'm gonna let it chill for a while without PBO.
 
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Reactions: lightmanek and A///

pj-

Senior member
May 5, 2015
481
249
116

lopri

Elite Member
Jul 27, 2002
13,211
597
126
I am having a very odd issue(s) with a 7950x3d build

GPU is a 7900xtx carried over from my previous 5950x build. PSU, cables, and full custom water cooling loop stuff all carried over as well.

SSD (990 pro - updated firmware), RAM (TForce 32gb 6000MT), MB (Asus x670e Prime Pro - updated bios) are all new.

I spent all day yesterday swapping in the new parts and everything worked fine with DOCP II and PBO enabled with -15 curve optimizer all core. It was working fine this evening as well and I updated chipset drivers, did some additional windows updates, and started playing with per core curve offsets. Was getting some BSODs / boot failures so I started backing off on the offsets until it was basically -15 on everything except two cores which were -20. Seemed fine and was installing a game when the system just clicked (instant off plus click sound) off. Assumed it was undervolt instability so backed that off, still wouldn't boot. Started lowering RAM speeds, still wouldnt boot. Set BIOS to load optimized defaults, still no boot. Cleared CMOS, etc, no luck.

During this time it seemed to POST fine (sequence of LEDs on motherboard indicated success) and start loading into windows but it would restart every time you would expect to see the windows login screen.

I could get to the windows recovery menu but the repair options didn't do anything. Wouldn't boot into safe mode. I eventually got into Windows via the install on the SSD from my previous system which I had put in another M.2 slot. The 990 Pro was visible in Windows and writeable as well. I was doing some troubleshooting and the system clicked off again. Got into windows again on the old SSD and before I could check windows event viewer it clicked off again.

Then for about 30 mins I couldnt even get into the old Windows install until I was writing this post and managed to get in again. Didn't change anything in the interim except power cycle a bunch of times. New drive still showed up but the moment I double clicked on it to open it, the system clicked off and restarted. Might be a coincidence because I booted into old Windows again and did the same thing without an issue. Downloaded Samsung Magician and did a Diagnostic test which indicated no issues. Got as far as doing 2/3 of a Timespy run as well which had more stuttering than normal but otherwise seemed fine, then in the middle of the second graphics test the framerate cratered and the system clicked off again. Clicked off twice in a row after restarting before getting to the Asus splash screen.

Nothing seems physically out of place. Cables well seated, no leaks in the loop, nothing looks especially hot in hwinfo. I think I burned myself slightly on the heatsink for the 990 Pro but it reports as 54-59C in hwinfo. Nothing else in the case feels remotely warm.

The saga continues as I've been writing this and I attempted a Windows Reset which allowed me to get back into windows on the 990Pro. Reinstalled Adrenaline and Far Cry 5 (SSD got up to 70C during validation step where Steam indicated it was reading at 700MB/s). Game seems to run as expected and the system even survived a reboot.

Any ideas what the heck happened / is happening? So many symptoms, some point to hw others point to sw. Maybe a hw issue borked my Windows install? I'm glad I am able to go to bed with a working PC but I am very confused and still worried.

Oh one other symptom is that sometimes the bios wouldn't detect either SSD after several failures in a row. A power cycle would get rid of that, no idea if it matters.
It definitely sounds like storage controller and/or its drivers issue to me. Or perhaps the promontory chip (the X670/B650 chipset) is not making a proper contact with the heat sink and overheats under load. Are you using an M.2 slot connected to the chipset for the boot disk?
 

pj-

Senior member
May 5, 2015
481
249
116
It definitely sounds like storage controller and/or its drivers issue to me. Or perhaps the promontory chip (the X670/B650 chipset) is not making a proper contact with the heat sink and overheats under load. Are you using an M.2 slot connected to the chipset for the boot disk?

Boot ssd was in the slot connected to the CPU, and it would be very hot even when idle with the asus board.

I made several followup posts after the one you quoted, the short version is that i returned that motherboard and got a gigabyte one which fixed SSD temps but didn't do much for the crashing. Exchanging the CPU ultimately fixed that problem and everything is good now.
 
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utahraptor

Golden Member
Apr 26, 2004
1,053
199
106
I don't know why, but my memory likes this new bios.



Edit:

I am not sure I trust these numbers. If I run 5 or 6 more tests I get even faster which I do not believe.

 
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Reactions: lightmanek

AdamK47

Lifer
Oct 9, 1999
15,309
2,913
126
I don't know why, but my memory likes this new bios.

View attachment 79744

Edit:

I am not sure I trust these numbers. If I run 5 or 6 more tests I get even faster which I do not believe.

View attachment 79745
Don't trust those numbers. Don't trust the AIDA64 memory benchmark.

The developers make up their own algorithms to present numbers they think people will believe. And believe people do.
 
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