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PSU good enough for SLI 570s?

post #1 of 28
Thread Starter 
http://ncix.com/products/index.php?sku=36264

Making a new build real soon.... specs are following:

P8P67 PRO
I5 2500K
Adata Gaming Series AX3U1600GB2G9-2G 4GB 2X2GB DDR3-1600 CL9-9-9-24
ZOTAC GTX 570
PSU?
FRACTAL DESIGN DEFINE XL
Western Digital Caviar Black 1TB SATA3 6GB/S
OCZ Vertex 2 Extended Sandforce 120GB
Corsair Cooling Hydro Series H50

Do I need a more powerful PSU? Toms gave a recommendation for the TP750 in a roundup and has generally good reviews...
I'm open to feedback.
post #2 of 28
The 750W TruePower New is a great choice! Not only is it a good quality unit, but it's at a very affordable price. It should be about perfect for this setup!
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post #3 of 28
They just had the Seasonic X750 on newegg with $25 off, I think I snagged it for like 125 or so. They might still have it on sale not sure.

Edit: Just checked, its not on sale anymore.
 
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post #4 of 28
Thread Starter 
Quote:
Originally Posted by nagle3092 View Post
They just had the Seasonic X750 on newegg with $25 off, I think I snagged it for like 125 or so. They might still have it on sale not sure.

Edit: Just checked, its not on sale anymore.
hey thanks for the heads up, but im from canada lol. Price isnt that much of a concern, i just would like to stay bellow 200$.
post #5 of 28
XFX 750W Black Edition - $105 after MIR
Seasonic 850HT - $114
post #6 of 28
570 sli runs fine on my ax750
post #7 of 28
For those of you that are claiming a 750w psu is enough, have you measured the draw from the wall socket?

From all that I had read before picking up my second 570, all 'magazine/site' notes show total system power approaching 600w+ and some folks on here reporting even more.

If this is the case I'd be reluctant to strain my PSU with loads near 700w (factor in overclocks and/or additional drives) so I'll more than likely pick up the 1000w corsair just to play it safe.

My conclusion, will a 750w PSU work? Yes.
Will it work well? If it's a good unit then yes.
Would you be better off with an 850-950 unit? Absolutely.
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post #8 of 28
Quote:
Originally Posted by Dark View Post
For those of you that are claiming a 750w psu is enough, have you measured the draw from the wall socket?

From all that I had read before picking up my second 570, all 'magazine/site' notes show total system power approaching 600w+ and some folks on here reporting even more.

If this is the case I'd be reluctant to strain my PSU with loads near 700w (factor in overclocks and/or additional drives) so I'll more than likely pick up the 1000w corsair just to play it safe.

My conclusion, will a 750w PSU work? Yes.
Will it work well? If it's a good unit then yes.
Would you be better off with an 850-950 unit? Absolutely.
The rating of the PSU is not its capacity in regards to what it can draw from the wall. Instead, it's the capacity that it can provide to the system.

So let's say that we have a system that is causing the power supply to pull 650W from the wall during a load test. Now let's also say that the efficiency is exactly 85% at the time of this power draw. This means that the computer system is pulling 552.5W from the power supply (650W * .85). So for this system, a quality 650W would be fine.

But now I'm curious: you have a TX750 powering your system and you have two GTX 570s in it. So, what's the highest power draw you've ever seen? Also, why are you saying things like "My conclusion, will a 750w PSU work? Yes. Will it work well? If it's a good unit then yes. Would you be better off with an 850-950 unit? Absolutely."? I mean again, you have a 750W power supply powering your system that has two GTX 570s in it. So if you are saying these things, then why don't you have a 'bigger' power supply?

Finally, don't worry about straining your PSU. According to these two excellent articles by Phaedrus2129, a quality 750W is right in the sweet spot for powering a modern system with two 570s in it:

http://www.overclock.net/power-suppl...fficiency.html

http://www.overclock.net/power-suppl...load-myth.html

[Source]
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #9 of 28
come on people this is a-level physics... you should know that it dosnt matter about what power it draws out the wall...
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Triggers broom
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post #10 of 28
i ran my rig off a 750w PSU for about 6 months without any issues....

somehow i think a 750 will be fine for SLI 570s....

I only upgraded to the 1KW PSU due to the fact my mate was upgrading and selling it cheap lol
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