CPU at 1.4 volts

[anti gravity]

I have built my new system with a 3900x and im having trouble keeping it cool when i check the voltage its at 1.4 volts not exactly but it goes up and down a tiny bit and i dont really know if its supposed to be like that

my cooling - ek p360 kit with a additional rad gpu is water cooled as well 

loop order gpu->cpu->rad->rad->pump

 

[Jurrunio]

arent you supposed to separate GPU and CPU with a radiator? Otherwise the CPU is bathing in GPU's warm liquid.

 

You could undervolt the CPU (negative voltage offset, make sure you benchmark since overdoing it could reduce performance), but that's not a proper fix for the problem

[anti gravity]

Just now, Jurrunio said:

arent you supposed to separate GPU and CPU with a radiator? Otherwise the CPU is bathing in GPU's warm liquid.

 

You could undervolt the CPU (negative voltage offset, make sure you benchmark since overdoing it could reduce performance), but that's not a proper fix for the problem

In this case the loop order doesnt matter because really the water doesnt heat up to 60 degrees 

 

[Jurrunio]

2 minutes ago, anti gravity said:

really the water doesnt heat up to 60 degrees 

heat transfer rate is determined by temperature difference, the hotter the liquid the less heat it can bring away.

 

Besides, 60C is ridiculously high, Asetek AIOs for example are rated up to 50C.

[anti gravity]

3 minutes ago, Jurrunio said:

heat transfer rate is determined by temperature difference, the hotter the liquid the less heat it can bring away.

 

Besides, 60C is ridiculously high, Asetek AIOs for example are rated up to 50C.

True but again i think its just the fact that my cpu is drawing to much power and the cpu block isnt ment for 105 vat tdp chips

 

[Bitter]

CPU temp isn't water temp though, I can have a CPU throttling at 100C on different cores and a 45C water temp.

[Jurrunio]

14 minutes ago, anti gravity said:

my cpu is drawing to much power

1.4V to a 3900X maxes out at about 160w of heat from the CPU, or 175w measuring from the EPS power cable (so VRM efficiency is considered). If this is considered as "too much power", wait till you face 9900k's 250w+ power draw when overclocked.

 

18 minutes ago, anti gravity said:

cpu block isnt ment for 105 vat tdp chips

TDP is a misused term

[anti gravity]

3 minutes ago, Jurrunio said:

1.4V to a 3900X maxes out at about 160w of heat from the CPU, or 175w measuring from the EPS power cable (so VRM efficiency is considered). If this is considered as "too much power", wait till you face 9900k's 250w+ power draw when overclocked.

 

TDP is a misused term

Yes i know but its there as a rough estimate 

[anti gravity]

Thers no way this is normal when idle 

[Jurrunio]

4 minutes ago, anti gravity said:

Yes i know but its there as a rough estimate 

Talking about 9900k with 95w TDP...

 

1 minute ago, anti gravity said:

Thers no way this is normal when idle 

It's normal, Zen 2 can go up to 1.47V for super short bursty workloads, and stupidly enough that includes moving the cursor around.

[anti gravity]

Fair enough but what could be causing the height temps could it be that i dont have enough radiators as in my rads cant dissipate enough heat 

i have 2 rads 400 x 130 x 38mm 

 

[Janne]

run a stress test and tell temps, for example my average is 66 degrees in a 30 minute cinebench run but when "idling" the temp maximums spike at over 70. this is normal because these cpus are allowed to go 1.5 V in low power workloads. also my cpu voltage is about 1,225 V with 4,0 GHz on all threads, socket power 145 W

[Jurrunio]

5 hours ago, anti gravity said:

Fair enough but what could be causing the height temps could it be that i dont have enough radiators as in my rads cant dissipate enough heat 

i have 2 rads 400 x 130 x 38mm 

 

as I said, you should put raidators between CPU and GPU in the chain. Reservoir and pump should also be after the radiator so they hold cooler liquid.

 

btw on voltage part, you should read that when you're actually running an all core workload, say Cinebench R20 multithread. Voltage should be lower in that case.

[Janne]

4 hours ago, Jurrunio said:

as I said, you should put raidators between CPU and GPU in the chain. Reservoir and pump should also be after the radiator so they hold cooler liquid.

 

btw on voltage part, you should read that when you're actually running an all core workload, say Cinebench R20 multithread. Voltage should be lower in that case.

Bullshit...................... loop order doesn't matter at all, stop spreading garbage information. Only thing that's a good rule of thumb is to put reservoir before pump so the pump will always have water running through it

[Dean.P.]

Faulty pump? 

[Jurrunio]

4 hours ago, Janne said:

Bullshit...................... loop order doesn't matter at all, stop spreading garbage information. Only thing that's a good rule of thumb is to put reservoir before pump so the pump will always have water running through it

Any actual advice to lower the liquid temp then?

[Janne]

44 minutes ago, Jurrunio said:

Any actual advice to lower the liquid temp then?

More radiator area and/or more airflow through the radiators of course, but i really can't give any advice to OP because he is so incoherent.