Power comsumption increase with OC

[dzsonni]

Hello forum,

As you can see in my config, I have 2 980s and a 4790k. My question is how much would power consumption increase with overclocking?
I know that right now the psu can easily handle the system, I am just wondering how much load overclocking would add. I want to OC both cards and the CPU as well.

What I am more concerned about is running the PSU near the upper limit. I wouldn't want to stress my hardware as I would like it to last at least another year or two 😛

Does anyone have any numbers? On one forum I have read that the overclocked 980 can draw 280W how accurate is this number?

BR,
dzsonni

 

[Thineswar]

try to look at these websites: http://www.tomshardware.com/reviews/core-i7-4790k-devils-canyon-overclock-performance,3845-9.html,

http://www.anandtech.com/show/8526/nvidia-geforce-gtx-980-review/22

 

[dzsonni]

try to look at these websites: http://www.tomshardware.com/reviews/core-i7-4790k-devils-canyon-overclock-performance,3845-9.html,

http://www.anandtech.com/show/8526/nvidia-geforce-gtx-980-review/22

Believed me I googled enough, that 280w was the highest number I came around that's why I included it in the post.

There are a lot of numbers out there that's why I wanted to hear some firsthand experience. Based on what I calculated in worst case my system shouldn't draw more than 750W I just wanted to confirm before I start pushing the limit. Still a beginner at this 😛

 

[Thineswar]

try to look at these websites: http://www.tomshardware.com/reviews/core-i7-4790k-devils-canyon-overclock-performance,3845-9.html,

http://www.anandtech.com/show/8526/nvidia-geforce-gtx-980-review/22

Believed me I googled enough, that 280w was the highest number I came around that's why I included it in the post.

There are a lot of numbers out there that's why I wanted to hear some firsthand experience. Based on what I calculated in worst case my system shouldn't draw more than 750W I just wanted to confirm before I start pushing the limit. Still a beginner at this 😛

i'm sorry but what is your question?

 

[dzsonni]

I wanted to hear some firsthand experience

As it says, I want to hear from people who actually tried OCing the 980.

 

[Thineswar]

I wanted to hear some firsthand experience

As it says, I want to hear from people who actually tried OCing the 980.

oh. sorry i can't help you on that, i don't have that gpu.

 

[Dunkan77]

Hello,

I just want to point out that unless you are using a custom BIOS on the cards, they aren't allowed to consistently 125% of its factory TDP which would eaqual to about 206 watts. What you saw on those threads about the max wattage pulled form the cards was probably peak power consumption but these only last for a few seconds as the card will not allow itself to consume that much power for extended periods of time. Be aware that 280 watts for a long time is a power increase of nearly 70% and even if you have a custom BIOS, you would only do that if you were running it on liquid nitrogen.

As for the power consumption in total, I would guess that an overclocked 4790K would consume about 140-170 watts depending on your chip and how much voltage you push through it because some chips overclock better or worse than what you may see on the internet because of irregularities in the silicon. What I saw for example was 141 watts with 1.275 volts and at 4.7 GHz.

So factoring in 220 watts for each GPU (to be safe) and knowing they will not be pulling this much power al the time even when gaming, your power draw would be about 600 to 660 watts. Please note that this estimation factors in WILD fluctuations of the peak power consumed by the components and that I am using the highest measured power draws for the calculation. It also depends on what temperature range you will want your components to run at as more voltage and power means higher performance and clock speed but also higher heat output and you may want really good case airflow for the two 980's not to be deprived of fresh cool air.

I hope this isn't too long to read and if you want more details and/or help concerning this topic please ask me and I will try to be as helpful as I can.
Cheers, Dunkan77

 

[dzsonni]

Hello,

I just want to point out that unless you are using a custom BIOS on the cards, they aren't allowed to consistently 125% of its factory TDP which would eaqual to about 206 watts. What you saw on those threads about the max wattage pulled form the cards was probably peak power consumption but these only last for a few seconds as the card will not allow itself to consume that much power for extended periods of time. Be aware that 280 watts for a long time is a power increase of nearly 70% and even if you have a custom BIOS, you would only do that if you were running it on liquid nitrogen.

As for the power consumption in total, I would guess that an overclocked 4790K would consume about 140-170 watts depending on your chip and how much voltage you push through it because some chips overclock better or worse than what you may see on the internet because of irregularities in the silicon. What I saw for example was 141 watts with 1.275 volts and at 4.7 GHz.

So factoring in 220 watts for each GPU (to be safe) and knowing they will not be pulling this much power al the time even when gaming, your power draw would be about 600 to 660 watts. Please note that this estimation factors in WILD fluctuations of the peak power consumed by the components and that I am using the highest measured power draws for the calculation. It also depends on what temperature range you will want your components to run at as more voltage and power means higher performance and clock speed but also higher heat output and you may want really good case airflow for the two 980's not to be deprived of fresh cool air.

I hope this isn't too long to read and if you want more details and/or help concerning this topic please ask me and I will try to be as helpful as I can.
Cheers, Dunkan77

Marvelous. Now this is an answer I like. Thank you very much Dunkan77

 

[Dunkan77]

Hello,

I just want to point out that unless you are using a custom BIOS on the cards, they aren't allowed to consistently 125% of its factory TDP which would eaqual to about 206 watts. What you saw on those threads about the max wattage pulled form the cards was probably peak power consumption but these only last for a few seconds as the card will not allow itself to consume that much power for extended periods of time. Be aware that 280 watts for a long time is a power increase of nearly 70% and even if you have a custom BIOS, you would only do that if you were running it on liquid nitrogen.

As for the power consumption in total, I would guess that an overclocked 4790K would consume about 140-170 watts depending on your chip and how much voltage you push through it because some chips overclock better or worse than what you may see on the internet because of irregularities in the silicon. What I saw for example was 141 watts with 1.275 volts and at 4.7 GHz.

So factoring in 220 watts for each GPU (to be safe) and knowing they will not be pulling this much power al the time even when gaming, your power draw would be about 600 to 660 watts. Please note that this estimation factors in WILD fluctuations of the peak power consumed by the components and that I am using the highest measured power draws for the calculation. It also depends on what temperature range you will want your components to run at as more voltage and power means higher performance and clock speed but also higher heat output and you may want really good case airflow for the two 980's not to be deprived of fresh cool air.

I hope this isn't too long to read and if you want more details and/or help concerning this topic please ask me and I will try to be as helpful as I can.
Cheers, Dunkan77

Marvelous. Now this is an answer I like. Thank you very much Dunkan77

You're welcome! 😀 I would still invest in a wattage-meter sort of thing if I really wanted to be sure and to know exactly how much the system draws but I don't think the real number would be very far form the estimate.
Again, I'm glad I helped!