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Power draw Help choose psu

post #1 of 10
Thread Starter 
I have the bug to buy another card. I also have option to sell this card and pick up two sapphire cards HD6970 for a great price.

Can my PSU handle another GTX570 or 2 HD6970s? They will get overclocked.

It is a Tagan BZ800w, good quality psu.

1 x SSD & 3HDDs connected.
Edited by Newbie2009 - 5/20/11 at 3:28am
post #2 of 10
both the 570 and 6970 have a tdp of around 250w give or take, you can very comfortably run them with a heavily overclocked cpu on a 750w psu so yours will be fine.
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post #3 of 10
Thread Starter 
mmm, I might upgrade anyway. If you were to choose, which of these PSUs would you go for?


http://www.hardwareheaven.com/review...onclusion.html

http://www.hardwarecanucks.com/forum...ly-review.html

Both about €50 cheaper than the corsair 1KW
Edited by Newbie2009 - 5/20/11 at 3:31am
post #4 of 10
Quote:
Originally Posted by Newbie2009 View Post
mmm, I might upgrade anyway.
Why? You've got plenty of wattage, unless you want to go tri or quad SLI. More watts =/= better performance, and you'll see reduced efficiency especially when running at or close to idle (which is most of the time unless you're folding.)
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Traches View Post
Why? You've got plenty of wattage, unless you want to go tri or quad SLI. More watts =/= better performance, and you'll see reduced efficiency especially when running at or close to idle (which is most of the time unless you're folding.)
My GTX570 when pushed outperforms and uses similar power to a GTX580. So essentially running 2x580s and an OCd cpu on an 800w seems either really tight or not possible to me.
post #6 of 10
2 x GTX570 (or 580) should be no problem at all for that PSU.
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post #7 of 10
Quote:
Originally Posted by Newbie2009 View Post
My GTX570 when pushed outperforms and uses similar power to a GTX580. So essentially running 2x580s and an OCd cpu on an 800w seems either really tight or not possible to me.
Assuming you can equate an overclocked 570 to a 580 (which is a flawed assumption), you're looking at a rated TDP per card of 244W (according to 15 seconds in google.) Looks like your processor draws 125W at 3.2ghz, so at 4.0 you're looking at around 150. Add it all up and you've got ~615W, which is approximately 3/4 of your PSU's rated power. You're not going to use up 200W with fans and HDs...

But don't get me wrong, it's your money
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post #8 of 10
Quote:
Originally Posted by Newbie2009 View Post
My GTX570 when pushed outperforms and uses similar power to a GTX580. So essentially running 2x580s and an OCd cpu on an 800w seems either really tight or not possible to me.
your current system is most likely drawing around 400-450w, you can easily add a second gpu with no risk what so ever of overloading your psu even if you over-clock everything to the absolute max.
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Acoma_Andy View Post
2 x GTX570 (or 580) should be no problem at all for that PSU.
Thanks man REP+

Quote:
Originally Posted by Traches View Post
Assuming you can equate an overclocked 570 to a 580 (which is a flawed assumption), you're looking at a rated TDP per card of 244W (according to 15 seconds in google.) Looks like your processor draws 125W at 3.2ghz, so at 4.0 you're looking at around 150. Add it all up and you've got ~615W, which is approximately 3/4 of your PSU's rated power. You're not going to use up 200W with fans and HDs...

But don't get me wrong, it's your money
Took the assumption from below. I hope your right! REP+
I usually go by GURU3D power consumption and recommendations.

post #10 of 10
Makes sense, guru3d is a good resource. It looks like those graphs are for the entire system, not a single card though. By adding one your consumption will only go up by ~250w, not 500 like the graph might seem to imply.

Anyway thanks for the +1
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Kathis
(16 items)
 
  
CPUMotherboardGraphicsRAM
2600k Maximus V Formula EVGA GTX 670 Kingston something 
Hard DriveHard DriveCoolingOS
OCZ Vertex 4 ~ 4 terabytes across 3 drives, not in RAID. 2 ... Water cooled, aquaero 5 LT controller/temp monitor Win7 x64 
MonitorMonitorKeyboardPower
Acer 23.3", 1920x1080 Acer 19", 1440x900 CM Storm Quickfire 700W Cooler Master Silent Pro 
CaseMouseMouse PadAudio
NXZT Switch 810 Logitech G9X Yup.  E-MU 1820m running into a Pyle 120wx2 amp, driv... 
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