7900x safe voltages

[Elite500]

hey, I want to try get my 7900x to 5ghz, it's stable at 4.8ghz w/ 1.255v now I've seen der8auer getting 5ghz with 1.32v, I'm more interested in what the voltage limit is as to the thermal since I've got it delidded and a huge high end custom watercooling loop set up.

[Hugs12343]

if you have high end custom water cooling, you can definately push it with a higher voltage. But be sure to do it in small incrememts (I recommend like .025 volts at a time maybe even less). Make sure you run a benchmark for atleast like an hour after you have reached your maximum to make sure that it's stable

[Elite500]

23 minutes ago, Hugs12343 said:

if you have high end custom water cooling, you can definately push it with a higher voltage. But be sure to do it in small incrememts (I recommend like .025 volts at a time maybe even less). Make sure you run a benchmark for atleast like an hour after you have reached your maximum to make sure that it's stable

yes sure, but how much voltage is safe? I don't want to reduce the lifespan of it below 2 years

[done12many2]

11 minutes ago, Elite500 said:

yes sure, but how much voltage is safe? I don't want to reduce the lifespan of it below 2 years

 

Nobody can tell you that.  There's not enough history with Skylake-X to determine reasonable operating voltages. 

 

If I were you, I'd remove all power and thermal limits and stress test your current overclock before moving any further to ensure that you aren't phantom throttling.  A fair amount of people have been phantom throttling because it's not visible by watching the clock speed in hardware monitoring.

 

How big is your loop?

[Elite500]

44 minutes ago, done12many2 said:

 

Nobody can tell you that.  There's not enough history with Skylake-X to determine reasonable operating voltages. 

 

If I were you, I'd remove all power and thermal limits and stress test your current overclock before moving any further to ensure that you aren't phantom throttling.  A fair amount of people have been phantom throttling because it's not visible by watching the clock speed in hardware monitoring.

 

How big is your loop?

it's got a thicc (60mm) 360mm corsair ML fans and a thinn (30mm) 420mm raidators (3x corsair ML 140mm) so it's quite big, it's also got 2x 1080 ti in it so yee

[done12many2]

As mentioned, remove any power and thermal limits and retest the CPU at 4.8 GHz with current voltage. 

 

I have 2 x 1080 Ti GPUs as well and had a very good 7900x before deciding to return it to wait for the higher core SKL-X chips. 

 

My loop consists of 5 x 360mm rads and I run 25 system fans in total. Before removing thermal limits the 7900x seemed nice an cool. As soon as they were removed, the CPU heated up quite a bit more. It was then that I realized that those limits were causing the CPU to throttle without reporting it.  4.7 GHz with 4 cores boosting to 4.8 ended up being my daily limit. 

 

Can you post your Cinebench R15 score at 4.8 GHz?  That can help in determining if you are throttling and not seeing it. 

[Elite500]

On 11.8.2017 at 3:31 PM, done12many2 said:

As mentioned, remove any power and thermal limits and retest the CPU at 4.8 GHz with current voltage. 

 

I have 2 x 1080 Ti GPUs as well and had a very good 7900x before deciding to return it to wait for the higher core SKL-X chips. 

 

My loop consists of 5 x 360mm rads and I run 25 system fans in total. Before removing thermal limits the 7900x seemed nice an cool. As soon as they were removed, the CPU heated up quite a bit more. It was then that I realized that those limits were causing the CPU to throttle without reporting it.  4.7 GHz with 4 cores boosting to 4.8 ended up being my daily limit. 

 

Can you post your Cinebench R15 score at 4.8 GHz?  That can help in determining if you are throttling and not seeing it. 

I'll try to remember to do that today, I got it stable to 4.9ghz @ 1.335v

[done12many2]

44 minutes ago, Elite500 said:

I'll try to remember to do that today, I got it stable to 4.9ghz @ 1.335v

 

I'd be willing to bet that you if your temperatures aren't insanely high that you are "phantom throttling".  

 

The CPU will downclock and cut performance without you knowing in the right conditions.  

[RichKnecht]

On 8/11/2017 at 7:15 AM, Elite500 said:

hey, I want to try get my 7900x to 5ghz, it's stable at 4.8ghz w/ 1.255v now I've seen der8auer getting 5ghz with 1.32v, I'm more interested in what the voltage limit is as to the thermal since I've got it delidded and a huge high end custom watercooling loop set up.

 

Your lucky. I can't get mine stable at 4.8. It can do 4.7 with 1.28V, but I don't like it hitting the high 80s