Overclocking my 3900x

[Zaf]

My current build is a 3900x cooled with a Thermaltake Floe Riing RGB 360 TT Premium Edition, on a ASUS Crosshair Hero motherboard. I also have three more fans for a total of six in my case, which is a Lian Li O11 Dynamic. I was watching a couple of videos on this chips overclock and what general cpu idle temperatures should be, and I feel like my idles are too high. Before setting all the volts down to below 1.4, it idled 60c. Now after turning the voltage down by a significant margin (to 1.3v), the idle temperatures are 42-50c. I have a all core oc of 4.2GHz, but when I run cinebench my temperatures shoot up to a max of 91c. I was wondering what I can do to help fix to that more reasonable 80c. All my fans are blowing out for aesthetic reasons, should I flip the top three fans on the cpu cooler to blow inward?I'm extremely new to overclocking, and just left my previous 2700x to do whatever it wants, but I think I can get reasonably more performance out of my 3900x. Any tips or help would be appreciated. Thanks!  

[DailyProcrastinator]

2 minutes ago, Zaf said:

Now after turning the voltage down by a significant margin (to 1.3v), the idle temperatures are 42-50c.

Voltage is likely still very high. 

 

3rd gen Ryzen doesn't really OC well to begin with, nor does it yield much performance gained, fast RAM and adjusting PBO settings in Ryzen Master is best if you want to ‘OC’. 3rd gen Ryzen CPU's seem to show faster degradation symptoms if higher voltages are applied (something I recently learned). For long term 'safe' OC'ing voltages below 1.375V were considered to be fine. However, this rule of thumb is adopted from overclocking Intel CPU's, and previous generations of AMD CPU's. So, for long term use I would NOT recommend OC'ing via the standard Manual method in Bios. Keeping the voltage low (1.27500V or lower) and adjusting PBO settings is the safest way to squeeze out some extra performance. But even then, only expect 100-300MHz at most.

 

Good read on voltage issues with the new Ryzen CPU’s: (And why I recommend low voltage)
https://www.reddit.com/r/overclocking/comments/ejd5c9/1325v_is_not_safe_for_zen_2/

 

[Zaf]

1 minute ago, TheDailyProcrastinator said:

Voltage is likely still very high. 

 

3rd gen Ryzen doesn't really OC well to begin with, nor does it yield much performance gained, fast RAM and adjusting PBO settings in Ryzen Master is best if you want to ‘OC’. 3rd gen Ryzen CPU's seem to show faster degradation symptoms if higher voltages are applied (something I recently learned). For long term 'safe' OC'ing voltages below 1.375V were considered to be fine. However, this rule of thumb is adopted from overclocking Intel CPU's, and previous generations of AMD CPU's. So, for long term use I would NOT recommend OC'ing via the standard Manual method in Bios. Keeping the voltage low (1.27500V or lower) and adjusting PBO settings is the safest way to squeeze out some extra performance. But even then, only expect 100-300MHz at most.

 

Good read on voltage issues with the new Ryzen CPU’s: (And why I recommend low voltage)
https://www.reddit.com/r/overclocking/comments/ejd5c9/1325v_is_not_safe_for_zen_2/

 

One of the videos I was watching was Jayz video on his adventure into oc'ing the 3900x, and he said that the idle voltage that the 3900x was pulling was unsafe. Should I leave those alone? Should I put them to something else? 

[Neftex]

lets be honest Jayz doesnt know nearly as much as the engineers who designed the cpu. so his "unsafe" voltage statement might not be correct

[DailyProcrastinator]

10 hours ago, Zaf said:

One of the videos I was watching was Jayz video on his adventure into oc'ing the 3900x, and he said that the idle voltage that the 3900x was pulling was unsafe. Should I leave those alone? Should I put them to something else? 

Well it depends by default on my Asus board my  CPU SOC Voltage, 1.8V PLL Voltage, and my SB Voltage were all set to high. I adjusted as follows:

 -         CPU SOC Voltage – Manual Mode – VDDSOC 1.1000V

-          1.8V PLL Voltage – 1.8000V

-          1.05V SB Voltage – 1.0500V

[Zaf]

5 hours ago, TheDailyProcrastinator said:

Well it depends by default on my Asus board my  CPU SOC Voltage, 1.8V PLL Voltage, and my SB Voltage were all set to high. I adjusted as follows:

 -         CPU SOC Voltage – Manual Mode – VDDSOC 1.1000V

-          1.8V PLL Voltage – 1.8000V

-          1.05V SB Voltage – 1.0500V

Is there any way I can reduce my temperatures still? I set the voltage down to 1.25, and when i hit it with r15 it caps at 84c on a 360mm AIO. 

edit: I ran r20 and it got as hot as 88c

Edited May 27, 2020 by Zaf