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Power requirements for GTX670 SLI?

post #1 of 21
Thread Starter 
Can my XFX XXX 650W handle it?

I'm looking to upgrade to the 670 and then SLI later down the road, but if I can't do it off my 650W I won't bother at all and just stick with the GTX 580.
VIII
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CPUMotherboardGraphicsRAM
i5 2500k ASUS P8Z68-V Pro Sapphire HD7950 boost Mushkin Enhanced Blackline 8GB, 1600MHz 
Hard DriveHard DriveOptical DriveCooling
Kingston HyperX 3k Samsung Spinpoint F3 1TB ASUS DVD burner Hyper 212+ 
OSMonitorKeyboardPower
Windows 8.1 ASUS VW246H U9BL XFX XXX 650W 
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Xigmatek Elysium Logitech G9 Rocketfish Xonar DX 
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VIII
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k ASUS P8Z68-V Pro Sapphire HD7950 boost Mushkin Enhanced Blackline 8GB, 1600MHz 
Hard DriveHard DriveOptical DriveCooling
Kingston HyperX 3k Samsung Spinpoint F3 1TB ASUS DVD burner Hyper 212+ 
OSMonitorKeyboardPower
Windows 8.1 ASUS VW246H U9BL XFX XXX 650W 
CaseMouseMouse PadAudio
Xigmatek Elysium Logitech G9 Rocketfish Xonar DX 
Audio
ATH AD700 
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post #2 of 21
Actually geoxile, your psu can handle a pair of sli gtx 670's!!! The max power draw for the two are around 325w peak and average about 250w under load. Here is a link to a techpowerup.com gtx 670 sli review. Hope this answers all your questions. thumb.gif
post #3 of 21
Oh wow, makes me wonder if I still should get my Seasonic 750w, I plan to 670 SLI as well....yea, probably still will tongue.gif
post #4 of 21
venomblade, I wouldn't upgrade if I were you, as long as the psu you have now can handle it. Save a few dollars and put that money towards something else. Maybe a new ssd! Those are always nice!!! 16
post #5 of 21
Quote:
Originally Posted by Vidia-King View Post

venomblade, I wouldn't upgrade if I were you, as long as the psu you have now can handle it. Save a few dollars and put that money towards something else. Maybe a new ssd! Those are always nice!!! 16

Well, my sig rig right now is actually my brother's and it features some low quality brand psu that I haven't seen around here, and wouldn't trust with one 670, Xion. Either way, ordering parts for my own rig tomorrow, 3570k/Asrock Z77 Extreme4/G.SkillSniper 8gb/GTX 670, and a Seasonic 750w PSU. I didn't realize how little power two 670s really drew, and I'm wondering if I should downgrade to a fully modular corsair 650w, or keep the semi modular seasonic 750w for the long haul.
Edited by venomblade - 5/30/12 at 6:17pm
post #6 of 21
I vote 650w, but that's just me. Pc components (electrical technology in general) are using less and less power everyday as we graduate toward a greener, more energy friendly planet. But we are also seeing a trend in peripherals and mobile devices using "usb" as a primary power / charging connection. Even monitors are now using usb for power, along with speakers, hubs, cell phones, tablets, ect...
So basically don't go overboard on the psu but don't skimp either. A power supply that is only being used at, lets say 20% of its max wattage capacity, will on the average actually run less efficient than one running at 60% capacity, running the same components.
post #7 of 21
Quote:
Originally Posted by Vidia-King View Post

I vote 650w, but that's just me. Pc components (electrical technology in general) are using less and less power everyday as we graduate toward a greener, more energy friendly planet. But we are also seeing a trend in peripherals and mobile devices using "usb" as a primary power / charging connection. Even monitors are now using usb for power, along with speakers, hubs, cell phones, tablets, ect...
So basically don't go overboard on the psu but don't skimp either. A power supply that is only being used at, lets say 20% of its max wattage capacity, will on the average actually run less efficient than one running at 60% capacity, running the same components.

You've nearly convinced me to switch here man tongue.gif. I'm leaning towards the Corsair HX 650 now. Just one more confirmation before I'm 100% gung-ho on the corsair, and that's amperage. The 650HX has 52@ on it's +12v rail, you think that'd be enough for 670 SLI? I also plan to OC the 3570k, nothing outrageous, probably ~ 4.2ghz.
post #8 of 21
Its around 25 amps for both of them under load.
For future reference, amps are equal to watts divided by volts for dc.

amp = watt / volt

or

A = W / V

I would say your prospect psu is good. I personally don't like corsair because they use oem parts and slap their name on it, but thats just me.

Good luck too you! biggrin.gif
post #9 of 21
Quote:
Originally Posted by Vidia-King View Post

Its around 25 amps for both of them under load.
For future reference, amps are equal to watts divided by volts for dc.
amp = watt / volt
or
A = W / V
I would say your prospect psu is good. I personally don't like corsair because they use oem parts and slap their name on it, but thats just me.
Good luck too you! biggrin.gif

That's perfect! Thanks for all the answers, +rep'd.
Edited by venomblade - 5/30/12 at 6:47pm
post #10 of 21
All (for the most part) pc components run off a 12v dc (direct current) psu. Like your cars 12 volt dc battery. The power coming out of the wall is ac (alternating current) 120v, your pc's psu steps down the 120v current through a transformer or series of step down transformers, to a 12v usable dc current. More on psu's and all that good stuff here (wiki).
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