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ati 6990 - Power Consumption

post #1 of 15
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Hi, Ok so looking at a new GFX card. For one 6970 seems about right but I need to know if my PSU will take it? 50Amp max output on the 12V rails. Will this be enough? I checked out some reviews and power consumption wattage: http://www.bit-tech.net/hardware/gra...6970-review/10

Can't see what the amps are needed. Can anyone tell me?
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post #2 of 15
Your title says "6990". Are you looking at the 6970 instead?
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post #3 of 15
Quote:
Originally Posted by REDHAMMER999 View Post
Hi, Ok so looking at a new GFX card. For one 6970 seems about right but I need to know if my PSU will take it? 50Amp max output on the 12V rails. Will this be enough? I checked out some reviews and power consumption wattage: http://www.bit-tech.net/hardware/gra...6970-review/10

Can't see what the amps are needed. Can anyone tell me?
If you talk about Radeon HD 6990.
My system draw 450 Watts in gaming when everything running at stock speed.
With Radeon HD 6990 clocked at 1000MHz Core/1500 MHz GDDR5 Memory, it'll take 600 Watts. The CPU still running at stock speed though.
My system uses more power because it has 5 HDDs and 7 fans (which should be taken into consideration as well).

If it were about Radeon HD 6970, I couldn't tell you the power consumption exactly because I don't have it.
Please note that the power consumption test from Bit-tech did not put your CPU & GPU into full load but it will likely reflect real world gaming power consumption.
You can count the rough Amps needed by dividing the Wattage by 12 (since most components use 12V Rail). For example in Bit-tech reviews, it use 306 Watts. 306/12 = 25.5. This is just a rough calculation.
Edited by Bima Sylirian - 6/20/11 at 4:40pm
    
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post #4 of 15
I was wondering if my PSu was enough for a 6990 ontop of my 6970. right now it pulls 310 watts while gaming with my 6970 stock clocks as well as the CPU. I have read that the 6990 can pull up to 450 watts even at stock clocks. So that in theory will put me at 760 watts.
post #5 of 15
Quote:
Originally Posted by Topgearfan View Post
I was wondering if my PSu was enough for a 6990 ontop of my 6970. right now it pulls 310 watts while gaming with my 6970 stock clocks as well as the CPU. I have read that the 6990 can pull up to 450 watts even at stock clocks. So that in theory will put me at 760 watts.
It's more than enough, actually. The readings you're getting at the wall are higher than what's being pulled from the power supply due to an efficiency that is lower than 100%. So if we say that your PSU is 85% efficient when it pulls 310W, then that would mean the system is pulling almost 264W from the power supply.
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post #6 of 15
Ahhhh. Well thanks for the heads up. I just everyone who is running a 6990 with a 6970 also having a 1000w or more PSU. I figure if I OC everything I may need more.

Quote:
Originally Posted by TwoCables View Post
It's more than enough, actually. The readings you're getting at the wall are higher than what's being pulled from the power supply due to an efficiency that is lower than 100%. So if we say that your PSU is 85% efficient when it pulls 310W, then that would mean the system is pulling almost 264W from the power supply.
post #7 of 15
Too many people have major overkill for PSUs.

I'm one of them, but it's only because I really, really wanted these colors. Plus, the HX450 (when it was available) would have cost me more with international shipping.
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post #8 of 15
Thread Starter 
Quote:
Originally Posted by Bima Sylirian View Post
If you talk about Radeon HD 6990.
My system draw 450 Watts in gaming when everything running at stock speed.
With Radeon HD 6990 clocked at 1000MHz Core/1500 MHz GDDR5 Memory, it'll take 600 Watts. The CPU still running at stock speed though.
My system uses more power because it has 5 HDDs and 7 fans (which should be taken into consideration as well).

If it were about Radeon HD 6970, I couldn't tell you the power consumption exactly because I don't have it.
Please note that the power consumption test from Bit-tech did not put your CPU & GPU into full load but it will likely reflect real world gaming power consumption.
You can count the rough Amps needed by dividing the Wattage by 12 (since most components use 12V Rail). For example in Bit-tech reviews, it use 306 Watts. 306/12 = 25.5. This is just a rough calculation.
This sounds like an interesting idea. In which case my power supply is not enough. as it only does 50Amps. so if 25.5 is taken by gfx card. then thats over half just by the gfx card, even if it is the most power hungry...
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post #9 of 15
Quote:
Originally Posted by REDHAMMER999 View Post
This sounds like an interesting idea. In which case my power supply is not enough. as it only does 50Amps. so if 25.5 is taken by gfx card. then thats over half just by the gfx card, even if it is the most power hungry...
I thought 306 is the whole system measured from wall socket. Not the Graphic Card only. Radeon HD 6970 alone consumes less than 200 Watts in gaming usage.

Quote:
Originally Posted by Topgearfan View Post
I have read that the 6990 can pull up to 450 watts even at stock clocks. So that in theory will put me at 760 watts.
My system draws 450 Watts. Not Radeon HD 6990 Graphic Card only. Without HD 6990, it uses only 130 Watts. So HD 6990 use roughly 320 Watts. Because my PSU Efficiency should be around 85-86%, Radeon HD 6990 roughly use 270 Watts in gaming condition. With VSync enabled, I can make it even lower because the GPU does not need to render more than 60 FPS.
Edited by Bima Sylirian - 6/23/11 at 6:48am
    
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post #10 of 15
Quote:
Originally Posted by REDHAMMER999 View Post
This sounds like an interesting idea. In which case my power supply is not enough. as it only does 50Amps. so if 25.5 is taken by gfx card. then thats over half just by the gfx card, even if it is the most power hungry...
If his system is drawing 600W from the wall, then that's roughly 510W being pulled from the PSU.

Anyway, you didn't answer my question before about which card you're talking about: your title says "6990", but both your post and the review you posted refer to the 6970. So, which card are you talking about?

If you are talking about the 6970, then you almost have enough power to have two 6970s in your system. If you're talking about the 6990, then you still have plenty, but there's no way you'd be able to get two 6990s in your system. hehe

Guru3D was able to pull 526W from the wall with their test system while their 6990 was unlocked (source). This means that the system pulled approximately 447W from the power supply. So if I add about 150W to account for the rest of the system (especially the CPU), then that results in approximately 600W of power being pulled from the PSU at the most if the 6990 is unlocked.

However, your PSU has a +12V capacity of 600W (50A) just like you said. So I think that if you decide to unlock this card, then I recommend easing into overclocking it. I mean, you can still overclock with the 6990 unlocked, but be cautious; increase the clocks slowly. If you experience any of the symptoms below after both unlocking and overclocking (if you don't unlock the 6990, then there's nothing to worry about), then you will need to either back off on the overclock a bit, or "lock" the card back up (so to speak):
  • bad 3D performance
  • crashing games
  • spontaneous reset or imminent shutdown of the PC
  • freezing during gameplay

If you do not unlock the 6990, then there's nothing to worry about whatsoever. If you're talking about the 6970, then again: you almost have enough power two have two 6970s in your system (but not quite).

Edited by TwoCables - 6/23/11 at 11:57am
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