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post #31 of 48
Just to help add some real world knowledge this weekend I will plug my rig into my Kill-a-watt and add my brothers 580 in there. But like I have already said my sig rig with a 460dropped for a 580 was fine. I was folding on both and the CPU, I gamed for a few hours and did some benchmarks, 3DMark11, Heaven, Metro, Mafia 11.

I know the seasonic is very good but I think it wouldbe helpful to show just what was being pulled.
post #32 of 48
Quote:
Originally Posted by tats View Post
Just to help add some real world knowledge this weekend I will plug my rig into my Kill-a-watt and add my brothers 580 in there. But like I have already said my sig rig with a 460dropped for a 580 was fine. I was folding on both and the CPU, I gamed for a few hours and did some benchmarks, 3DMark11, Heaven, Metro, Mafia 11.

I know the seasonic is very good but I think it wouldbe helpful to show just what was being pulled.
If you do this, then multiply the value on the Kill A Watt by .85 to account for 85% efficiency (I don't know how to find out the actual efficiency during a power draw).
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post #33 of 48
Quote:
Originally Posted by Plex View Post
Agreed, seriously.

Like I said in the first response of the thread and like TwoCables just said a post or two ago (he's one of our PSU gurus): get a high quality 850W unit.
with my current psu now can i go sli gtx580?? cuz i was thinkin to get corsair ax1200
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post #34 of 48
Quote:
Originally Posted by teichu View Post
with my current psu now can i go sli gtx580?? cuz i was thinkin to get corsair ax1200
Absolutely!

Again:

Guru3D was able to get their test system to pull 719W from the wall outlet with two GTX 580s in this system (source). So if I assume 85% efficiency during this power draw, then that would mean that the system pulled about 611W from the power supply.

So if I add 150W for the CPU and other goodies, then that means we could be looking at about 760W of power being pulled from the power supply under the highest loads when both the CPU and the GTX 580s are under full load at the same time.

If I assume about 80% efficiency, then that would mean the system pulled about 575W from the power supply which would be about 725W after adding the 150W.

On the other hand, if I assume 90% efficiency, then that would mean that the system pulled about 647W from the PSU which would be about 797W after adding that 150W.

So a quality 750W power supply is the minimum, but I would go with a quality 850W power supply just in case you get the urge to overclock.
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post #35 of 48
+1 to TwoCables, good facts there...
Plex i'll give you +1 for being so confident...
i'll have my older TX750W thorougly tested...

Also I THINK the setting under the Nvidia control panel "Power Management" was set to ADAPTIVE...
Make sure you check it to Performance when you get two of these cards and also if you have one monitor, check it for single display performance mode...
Just my 2 cents...
This might have caused that card to throttle (thus not getting enough power), I changed drivers/checked settings and upgraded my PSU all at the same time...
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post #36 of 48
Quote:
Originally Posted by teichu View Post
with my current psu now can i go sli gtx580?? cuz i was thinkin to get corsair ax1200
Your AX850 is absolutely perfect for 2x 580s. There is no need to get the AX1200 unless you have 3x of them.
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post #37 of 48
I measured my rig with a killawatt and it pulls 850 from the wall. But thats with 18 fans, 2 water pumps and max oc on every thing. I used I7 970 4.4Ghz(1.44v), 2 GTX 580's @ (950core) 1.1v. A good 750 watt can run it but I wouldnt recomend it just because you will have no room to grow for a 3rd gpu is you wanted to.
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post #38 of 48
Quote:
Originally Posted by Desert Rat View Post
I measured my rig with a killawatt and it pulls 850 from the wall. But thats with 18 fans, 2 water pumps and max oc on every thing. I used I7 970 4.4Ghz(1.44v), 2 GTX 580's @ (950core) 1.1v. A good 750 watt can run it but I wouldnt recomend it just because you will have no room to grow for a 3rd gpu is you wanted to.
Nice!

So if we assume about 85% efficiency, then that would mean your system pulled about 722W from the power supply during that power draw.

Or if I assume 90%, then it would mean that it pulled 765W from the PSU.

Or if I assume 80%, then it would mean that the system pulled about 680W from the PSU. Although, you have the AX1200, so I'm leaning towards 85% or maybe even 90%.
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It's a computer!
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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post #39 of 48
Quote:
Originally Posted by TwoCables View Post
Absolutely!

Again:

Guru3D was able to get their test system to pull 719W from the wall outlet with two GTX 580s in this system (source). So if I assume 85% efficiency during this power draw, then that would mean that the system pulled about 611W from the power supply.

So if I add 150W for the CPU and other goodies, then that means we could be looking at about 760W of power being pulled from the power supply under the highest loads when both the CPU and the GTX 580s are under full load at the same time.

If I assume about 80% efficiency, then that would mean the system pulled about 575W from the power supply which would be about 725W after adding the 150W.

On the other hand, if I assume 90% efficiency, then that would mean that the system pulled about 647W from the PSU which would be about 797W after adding that 150W.

So a quality 750W power supply is the minimum, but I would go with a quality 850W power supply just in case you get the urge to overclock.
even with overclock both of gtx580?? if i overclock both of my gtx580 to 880mhz , hx850 will be ok for it?
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My System
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CPUMotherboardGraphicsRAM
I7-3930K@4.6GHZ ASUS RAMPAGE IV EXTREME EVGA GTX680 SLI Corsair Vengence DDR3 16GB 1600@8-8-8-24 
Hard DriveCoolingOSMonitor
Intel 520 Series 180GB SSD+WD Caviar Black 1TB ... RASA KIT EX360 WINDOWS 7 64 BIT Acer GD235HZ 120HZ 
PowerCase
CORSAIR AX1200 COOLERMASTER HAF X-942 
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post #40 of 48
Quote:
Originally Posted by Desert Rat View Post
I measured my rig with a killawatt and it pulls 850 from the wall. But thats with 18 fans, 2 water pumps and max oc on every thing. I used I7 970 4.4Ghz(1.44v), 2 GTX 580's @ (950core) 1.1v. A good 750 watt can run it but I wouldnt recomend it just because you will have no room to grow for a 3rd gpu is you wanted to.
So roughly 722 for the rig. This seems right on, I'd like to see the difference I see with a few less components and a SB instead of a 970.

Edit: damn TwoCables you're fast!
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