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need a new PSU for HD6970s and physx 460 - Page 4

post #31 of 42
Quote:
Originally Posted by TwoCables View Post
Why? AMD recommends a 550W peak-rated PSU to power a system that has one 6970 in it, so they would likely recommend a 650-750W peak-rated unit to power a system that has two 6970s.

So I don't understand: the GTX 460 as a PhysX card wouldn't pull that much power, would it?
I was thinking along the lines of TwoCables as well. 750 would have been my recommendation. Care to explain Phaedrus?
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post #32 of 42
My research has shown than when overclocking and increasing the power cap, an HD6900 card's power consumption can jump dramatically.

I actually made a small mistake, user with three HD6970s, not two HD6970s and a PhysX card like I thought.

Still, 850-900W power supply is recommended if overclocking and power cap tweaking will be involved.
post #33 of 42
Quote:
Originally Posted by phaedrus2129 View Post
i recommend a 1000w power supply for this system.
bam!

twocables: it's because the psu should be calculated in a worst case scenario with everything loaded, rather than depending on a component staying near idle.
Edited by railfan844 - 7/23/11 at 7:50pm
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post #34 of 42
Quote:
Originally Posted by Phaedrus2129 View Post
My research has shown than when overclocking and increasing the power cap, an HD6900 card's power consumption can jump dramatically.

I actually made a small mistake, user with three HD6970s, not two HD6970s and a PhysX card like I thought.

Still, 850-900W power supply is recommended if overclocking and power cap tweaking will be involved.
So are you going to move the 6970s up to a 750 watt for Xfire in your calculator?
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post #35 of 42
Quote:
Originally Posted by Phaedrus2129 View Post
My research has shown than when overclocking and increasing the power cap, an HD6900 card's power consumption can jump dramatically.

I actually made a small mistake, user with three HD6970s, not two HD6970s and a PhysX card like I thought.

Still, 850-900W power supply is recommended if overclocking and power cap tweaking will be involved.
So now the question he needs to answer is whether or not he'll be overclocking and whether or not he'll be tweaking the powercap.


Quote:
Originally Posted by railfan844 View Post
bam!

twocables: it's because the psu should be calculated in a worst case scenario with everything loaded, rather than depending on a component staying near idle.
lol "bam"?

Sigh. This isn't a contest.

Besides, read Phaedrus2129's most recent post. It sounds to me like he would agree with me if he found out that bkilla187 was not going to be overclocking the 6970s or doing any powercap tweaking.

Anyway, I was not making a recommendation before basing on components staying near idle! Why would I do that?! Why would anyone do that? My recommendation is a quality 750W power supply. Phaedrus2129 recommends a quality 850-900W unit if he's going to overclock the 6970s as well as perform powercap tweaking.

Therefore, bkilla187 has all of the information he needs now.
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post #36 of 42
Quote:
Originally Posted by TwoCables View Post
So now the question he needs to answer is whether or not he'll be overclocking and whether or not he'll be tweaking the powercap.



lol "bam"?

Sigh. This isn't a contest.

Besides, read Phaedrus2129's most recent post. It sounds to me like he would agree with me if he found out that bkilla187 was not going to be overclocking the 6970s or doing any powercap tweaking.

Anyway, I was not making a recommendation before basing on components staying near idle! Why would I do that?! Why would anyone do that? My recommendation is a quality 750W power supply. Phaedrus2129 recommends a quality 850-900W unit if he's going to overclock the 6970s as well as perform powercap tweaking.

Therefore, bkilla187 has all of the information he needs now.
Basically yes to all of that. It's the power cap that has the biggest effect; then power cap plus GPU overclocking leads to massive power draw increases. A stock HD6970 is a relatively tame beast. Undo its chains and it will out-draw a GTX480.

Also don't forget the PhysX card. The draw on those isn't negligible, unless we're talking about like an 8600 or 9400 or 220 or something.
Edited by Phaedrus2129 - 7/23/11 at 8:19pm
post #37 of 42
Quote:
Originally Posted by VW_TDI_02 View Post
So are you going to move the 6970s up to a 750 watt for Xfire in your calculator?
I added a GPU overclocking and power cap tweaking section to the calculator, which should be all that's needed. At stock HD6970s would still do fine Crossfired on a 650W.
post #38 of 42
@ Phaedrus2129

hi
i had a look at your psu calculator...
Where do you get the measures of consumption for the various cards?
I usually look ht4u.net which measure consumption directly on the card

for example ... 6970
http://ht4u.net/reviews/2010/amd_rad...st/index22.php
test with little OC
http://ht4u.net/reviews/2010/amd_rad...st/index24.php

on furmark detect up to 280W ... in game 216W... this value is higher than your classification on your guide

Please have a look at the testing methodology of this site? What do you think?this explain http://ht4u.net/reviews/2009/power_c...ics/index5.php

thanks
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post #39 of 42
Quote:
Originally Posted by Carlos Hilgert Ferrari View Post
wrong.

More than 750w is overkill.

Get a Corsair 750w/ XFX CORE ED 750w / Antec 750w / Seasonic 750w
Read Phaedrus' post in this thread. I have 6970 CF and it consumes a lot of power once you increase voltage and add PowerTune +20%. 6970 basically becomes close to a 300W card like a GTX 480. OP has watercooling so I assume he is going to put the cards under water too. He is going to unlock the TDP cap and increase a lot of voltage.

A GTX 460 still consumes quite a lot energy even as a PhysX card especially when overclocked.
post #40 of 42
Quote:
Originally Posted by TwoCables View Post
So now the question he needs to answer is whether or not he'll be overclocking and whether or not he'll be tweaking the powercap.



lol "bam"?

Sigh. This isn't a contest.

Besides, read Phaedrus2129's most recent post. It sounds to me like he would agree with me if he found out that bkilla187 was not going to be overclocking the 6970s or doing any powercap tweaking.

Anyway, I was not making a recommendation before basing on components staying near idle! Why would I do that?! Why would anyone do that? My recommendation is a quality 750W power supply. Phaedrus2129 recommends a quality 850-900W unit if he's going to overclock the 6970s as well as perform powercap tweaking.

Therefore, bkilla187 has all of the information he needs now.
I didn't mean it to be a contest

By Bam I meant OP now has an answer that is 100% accurate....

The reason I thought you were depending on the 460 staying near idle was because you said it wouldn't pull that much power as a physx card. By "near idle" I meant at less than ~100% load.

And yes I think he would have said anywhere between 750 and 800 for keeping everything stock. Close enough
Edited by railfan844 - 7/24/11 at 9:18pm
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