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Have kill-a-watt readings, need advice on PSU for gtx 580 sli

Poll Results: Upgrade PSU?

 
  • 66% (2)
    What you have is adequate
  • 0% (0)
    Upgrade to an 850w
  • 33% (1)
    You need at least 1000w to utilize those cards
3 Total Votes  
post #1 of 5
Thread Starter 
Okay, here is my system

ASUS P8Z68 Deluxe
2600k at 1.34v load @ 4.5ghz
2 sticks gskill sniper, oc'ed to 1.35v @ 1866
1 crucial m4 64g
1 samsung 1tb storage drive
1 dvd-rw
2 gtx 570's stock clocks
2 yate loon hi-speed 2k rpm fans on a corsair h50
3 more 1400 rpm case fans
corsair tx750 modular (80 plus silver rating)

I bought 2 lightning extreme 580's the other day and I have read mixed things on whether or not a 750 watt could power them in SLI. Granted, I assume I would definitely want a beefier setup to OC them, but to run them at stock, do you think it would be enough to use a 750?

I got a kill-a-watt reader today and these are the numbers I got at the outlet for doing the following:

Idle: 145w
BF3 on all ultra 1080: 507w
Unigine normal settings at 1080: 450w
Cinebench: 250 w
IBT on maximum stress: 290w
AIDA 64 torture test: 250w
Unigine normal settings with OCCT cpu test, med. data set: 540w peak, avg 450-90
Unigine normal settings with OCCT linpack: 550w peak, avg 450-90
Unigine with max settings, 8xmsaa, 16xaa, 1080: 460w
Unigine maxed out with OCCT linpack maxed out: 575 watts

In addition to those readings I have a question. I have been reading up on the 80 plus certifications and the tx 750 is 80 plus silver certified. I believe at 100 percent load it says 85 percent efficiency minimum. Does that mean that the PSU will power 750 watts regardless, but it may pull 15% more from the outlet, or does it mean that of all the 750 watts, it can only supply a maximum of 637 watts to the components plugged in? I do intend on upgrading to an 850 or maybe 1000 in the future, but what are your opinions on what I have being enough to power the 580's? I also put all my components into the OCN psu calculator, and it lists my power supply as being enough, but is that legitimate to go by?
post #2 of 5
The tests were run using the 570's, right?

If so, then I think you have sufficient headroom to use the 580's.

Your psu is capable of giving the components 750w(and a bit more, until ocp kicks in) silver efficiency means that at that load it would pull ~890w from the wall.

Also. Are you sure it's a tx750w, because there is no modular tx750 with silver efficiency, so it's either a the tx750m Bronze or hx750 Silver.
Edited by Kasp1js - 1/10/12 at 10:32am
Dunno
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3550 Asrock P67 Extreme4 Gen3 MSI HD7850 1GB Kingston Hyperx Blu 2x2GB 
RAMHard DriveHard DriveCooling
Kingston Hyperx Blu 2x4GB Samsung Spinpoint F3 1tb Intel 330 60Gb SSD Scythe Mugen 2 
OSMonitorMonitorPower
Windows 8 Pro Acer AL2416W Samsung 940n Chieftec 750w 
Case
Thermaltake V4 
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Reply
Dunno
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3550 Asrock P67 Extreme4 Gen3 MSI HD7850 1GB Kingston Hyperx Blu 2x2GB 
RAMHard DriveHard DriveCooling
Kingston Hyperx Blu 2x4GB Samsung Spinpoint F3 1tb Intel 330 60Gb SSD Scythe Mugen 2 
OSMonitorMonitorPower
Windows 8 Pro Acer AL2416W Samsung 940n Chieftec 750w 
Case
Thermaltake V4 
  hide details  
Reply
post #3 of 5
Thread Starter 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011

been eyeing this one if I do have to upgrade. Think that would be enough? I dont ever plan on going to more than 2 cards anyways.
post #4 of 5
Thread Starter 
Quote:
Originally Posted by Kasp1js View Post

The tests were run using the 570's, right?
If so, then I think you have sufficient headroom to use the 580's.
Your psu is capable of giving the components 750w(and a bit more, until ocp kicks in) silver efficiency means that at that load it would pull ~890w from the wall.
Also. Are you sure it's a tx750w, because there is no modular tx750 with silver efficiency, so it's either a the tx750m Bronze or hx750 Silver.

yea my bad its the modular one.
post #5 of 5
If you want to upgrade, there is no one stopping you, but you would be fine using the psu you have. thumb.gif
Dunno
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3550 Asrock P67 Extreme4 Gen3 MSI HD7850 1GB Kingston Hyperx Blu 2x2GB 
RAMHard DriveHard DriveCooling
Kingston Hyperx Blu 2x4GB Samsung Spinpoint F3 1tb Intel 330 60Gb SSD Scythe Mugen 2 
OSMonitorMonitorPower
Windows 8 Pro Acer AL2416W Samsung 940n Chieftec 750w 
Case
Thermaltake V4 
  hide details  
Reply
Dunno
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 3550 Asrock P67 Extreme4 Gen3 MSI HD7850 1GB Kingston Hyperx Blu 2x2GB 
RAMHard DriveHard DriveCooling
Kingston Hyperx Blu 2x4GB Samsung Spinpoint F3 1tb Intel 330 60Gb SSD Scythe Mugen 2 
OSMonitorMonitorPower
Windows 8 Pro Acer AL2416W Samsung 940n Chieftec 750w 
Case
Thermaltake V4 
  hide details  
Reply
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