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7970 psu not enough amperage?

post #1 of 22
Thread Starter 
I am wondering if my system is not getting enough amps. My 7970 is oced at 1170/1740 and2600k is 4.5 1.32v. 2x200 fans with a fan controller. My psu is 63 amps and my gpu reaches 81degrees. But if I disconnect my fans hdd and burner it goes down to 74degrees. Do I need a bigger psu?
Edited by onthemour - 9/29/12 at 11:03am
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post #2 of 22
Sounds like your rig has either poor cooling or your fan setup is incorrect. More than enough power to run a 7970 and 2600K. Heck, I ran a 7970 on a 400w PSU and used about half of it's capacity.
post #3 of 22
Thread Starter 
No this is tests with the case open. So Airflow is not the issue. I did the math for the amps and I am over
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post #4 of 22
you should be able to run 2 7970's on a good gold rated PSU. Something is faulty in your setup cause that 750 is overkill for that system by a wide margin.
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post #5 of 22
do you have the tools to measure output through the wall plug?

seriously, that psu is more than enough for the 7970
    
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post #6 of 22
Thread Starter 
I know this is enough volts. I am asking about current ie amperage. The 7970 draws more than 30 at stock and 20 to40% more if oced. Which puts it at close to 40. Now 15 for mobo and all fans with controller puts my total draw over 60. So when I play a game my gpu is pulling more than my psu can give so it sucks out more volts to compensate for lack of amperage. This causes more heat and stain on system. The is a reason why some people can get higher oces than others and a reason why some people have 1000 watt psu for small systems. I know my system can take anything I throw at it. I just want to know about the amps. A bigger psu with more amps may give me a cooler and higher oc
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post #7 of 22
I think you have it wrong there. My question was if you had any tools to measure the amount of amperes your psu is drawing from the socket. (note that it loses a bit and will show higher than what it actually outputs)

I personally don't think that the problem is PSU related at all and might be something completely different.
    
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post #8 of 22
Quote:
Originally Posted by onthemour View Post

I know this is enough volts. I am asking about current ie amperage. The 7970 draws more than 30 at stock and 20 to40% more if oced. Which puts it at close to 40. Now 15 for mobo and all fans with controller puts my total draw over 60. So when I play a game my gpu is pulling more than my psu can give so it sucks out more volts to compensate for lack of amperage. This causes more heat and stain on system. The is a reason why some people can get higher oces than others and a reason why some people have 1000 watt psu for small systems. I know my system can take anything I throw at it. I just want to know about the amps. A bigger psu with more amps may give me a cooler and higher oc

This isn't how it works at all... Considering your obvious lack of knowledge regarding anything electrical, please listen to us and be assured that your PSU is perfectly fine for two overclocked 7970s. I honestly won't bother arguing because your argumentation doesn't make any sense.
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post #9 of 22
Quote:
Originally Posted by onthemour View Post

I know this is enough volts. I am asking about current ie amperage. The 7970 draws more than 30 at stock and 20 to40% more if oced. Which puts it at close to 40. Now 15 for mobo and all fans with controller puts my total draw over 60. So when I play a game my gpu is pulling more than my psu can give so it sucks out more volts to compensate for lack of amperage. This causes more heat and stain on system. The is a reason why some people can get higher oces than others and a reason why some people have 1000 watt psu for small systems. I know my system can take anything I throw at it. I just want to know about the amps. A bigger psu with more amps may give me a cooler and higher oc

That's not how it works. Your PSU can handle almost anything you throw at it.
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post #10 of 22
Quote:
But if I disconnect my fans hdd and burner it goes down to 74degrees. Do I need a bigger psu?

@onthemour, if u disconnect them, how do u run them? u mean u power them with a different psu?
Quote:
I know this is enough volts. I am asking about current ie amperage. The 7970 draws more than 30 at stock and 20 to40% more if oced. Which puts it at close to 40.

If u're talking about current flow(ampere), then 7970 doesnt draw 30 at stock. It draws from 210 to 270 watt maximum(this info varies,strangely.. tom's hardware says 250 watt and guru3d says 210 watt TDP for this card).. So that makes the current 270/12=22.5A maximum...(As u probably know Power=current * voltage)

Remember modern graphics cards and processors take power from the 12V rail.. Thats why divided by 12.

And ur processor TDP is 95 watt, according to Intel...

So U said ur psu is 63 amp.. Do u mean it has 63A over the 12V rail alone? If so, then surely ur psu has enough power.
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