weird issue regarding 2700x

[viceice]

Hi people, i've been tinkering with my r7 2700x these days and having some problems about voltages. first off; i have this board,

https://www.gigabyte.com/Motherboard/B450-Gaming-X-rev-10#kf

dram voltage at 1.38v and ram speed at 3200 mhz 2x8 16 gb ram

 

let me get down to the problem,

 

i feel like my mobo is giving a bit more voltage than the cpu needs

 

for example; when everything is left at stock cpu boosts to 4 ghz and some momentary 4.25 ghz. the SVI2 TFN voltage sensor shows 1.27-1.29 voltage for this speed.

 

then i read somewhere that 2700x usually do 3.7 gz @1.0 volts. so i figured i would try to close the boost to see what voltage would it get.

 

so it got 1.1 volt for 3.7 ghz stock speed. 

 

my predicament starts when i tried to undervolt.

 

when i put negative vcore offset in the bios; instead of undervolting, the cpu underclocks itself.

 

for example, if i put -0.05 offset to vcore; cpu boosts to 3975 mhz @1.24v

 

--

 

what should i do, manual oc or just let it do its thing?

 

my main question is, does undervolt works like this in other mobos or is it just that my mobo does it bad/wrong:?

 

[Nas]

This is a known Ryzen issue, undervolting is kind of weird on the platform. Even when it does work, you get worse performance at the same frequency than what you used to. It seems to be mostly a software reporting problem.

 

https://www.gamersnexus.net/guides/3494-amd-ryzen-3000-undervolting-offset-override

 

 

[Guest]

2700x is voltage hog.

 

Stock boost FXR can be seen up to and near 1.5v single core. 

 

Additionally, the board you have is rather weak in the VRM package area for a 2700x. You can confirm this via the stickied motherboard list.

[viceice]

19 hours ago, ShrimpBrime said:

2700x is voltage hog.

 

Stock boost FXR can be seen up to and near 1.5v single core. 

 

Additionally, the board you have is rather weak in the VRM package area for a 2700x. You can confirm this via the stickied motherboard list.

thats right; but gaming was i was told it would be ok ; im not doing any cpu intensive renders

 

if that were to be case, i would also disable core boost, but for now, it seems okay for gaming. vrm temps stay 50-60 degrees, or 70-80 degrees if +20 offset were to be added, so still okay i guess?

 

you mean to say, vrms causes the cpu to be overvolted? 

 

--

 

i've enabled PBO and added a -0.09 negative offset

 

in game i get 4050-4075 and momentary 4.1 ghz with a voltage range of 1.27-1.32

 

is this seems more plausible to use compared to stock boost? 

 

temps seem to be same as well

 

----

 

here is the gaming scenario with pbo -0.09 ;

 

 

https://prnt.sc/s99ust

 

i practically get more speed for about the same voltage. it seems weird :hmm

 

----

 

i also tested 3.7 ghz. now i get 1.05 volts for 3.7 ghz instead of 1.1. volts.

 

i think i succeded? 

[Guest]

Perhaps try turning of SMT. This will reduce power consumption a little bit and perhaps lower the temps a tad also.

 

But yes, I suspect too low of vcore to cause issues. The cpu would rather have more than less to operate at frequency. 

 

Mine 3.7ghz the pstate voltage manually set at 1.212v is not enough. It actually needs closer to 1.3v. But thats the experience I have with mine as an example for you.