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2 gtx 580s, i7-2600k both overclock, 850 psu enough

Last response: in Graphics & Displays
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March 17, 2012 8:41:18 PM

i will be overclocking the EVGA GeForce GTX 580 Fermi 772MHZ 1536MB GDDR5 2XDVI Mini-HDMI PCI-E Video Card to about 850 mhz and the i7 to about 4.4ghz, got a few case fans and a sound card, and other basic components, will my Corsair Professional Series Gold AX850 CMPSU-850AX 850W ATX Fully Modular 80PLUS Gold Power Supply handle it? or should i not oc?
a c 251 U Graphics card
a c 138 K Overclocking
March 17, 2012 8:52:10 PM

Well the good thing about overclocking is that you can choose the settings that you want to overclock to.If that means that you have to clock the cpu to 4.2ghz and the cards to 800 mhz then that's what you have to do. Then again you may get to the desired settings that you want. The Evga Presision now comes with a voltage adjustment so you can get to a desired clock by adding a little voltage.
I would start with the cpu and get it to where you want and make sure the system is stable then add some mhz to the video cards and see where you can get for the system to be stable. Two GTX 580's in SLI really don't need to be overclocked , I leave mine at stock and get great gameplay. I do overclock the cpu so that there is no bottleneck.
March 17, 2012 9:16:18 PM

inzone said:
Well the good thing about overclocking is that you can choose the settings that you want to overclock to.If that means that you have to clock the cpu to 4.2ghz and the cards to 800 mhz then that's what you have to do. Then again you may get to the desired settings that you want. The Evga Presision now comes with a voltage adjustment so you can get to a desired clock by adding a little voltage.
I would start with the cpu and get it to where you want and make sure the system is stable then add some mhz to the video cards and see where you can get for the system to be stable. Two GTX 580's in SLI really don't need to be overclocked , I leave mine at stock and get great gameplay. I do overclock the cpu so that there is no bottleneck.


well not really the answer to my question, but ok
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a c 212 U Graphics card
a c 131 K Overclocking
March 17, 2012 9:21:44 PM

No.....and 850 watter is good for two overclocked 560 Ti's and even 570's but not two 580's. The smallest nVidia certified PSU for twin 580's is IIRC, 950 watts.

You may wanna consider that two of these get just 10% less fps than twin 580's for less than half the price.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And they can be overclocked another 20%

http://www.pureoverclock.com/review.php?id=1201&page=17





March 17, 2012 9:26:00 PM

what are the rest of your specs?
March 17, 2012 9:50:41 PM

JackNaylorPE said:
No.....and 850 watter is good for two overclocked 560 Ti's and even 570's but not two 580's. The smallest nVidia certified PSU for twin 580's is IIRC, 950 watts.

You may wanna consider that two of these get just 10% less fps than twin 580's for less than half the price.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

And they can be overclocked another 20%

http://www.pureoverclock.com/review.php?id=1201&page=17


you could run 2 stock 580s well within an 850 watt psu....why does everyone overestimate power draw of these cards??
March 17, 2012 10:12:02 PM

a bit more than that, you're forgetting all other components.

Power draw of:
2600k@ 4.4 Ghz, 1.3v
2 (stock) GTX 580's
1 Motherboard
2 Sticks ddr3
1 sata 7200 rpm HDD
1 Optical Drive
4 Case Fans
And an H80 (I presume you'd want good cooling if you're gonna oc)
= 782 watts
a b U Graphics card
a b K Overclocking
March 17, 2012 10:16:41 PM

The total system draw is around 700w. 2600K overclocked without using the graphics core is going to be 100w or less.
March 17, 2012 10:26:42 PM

To anyone who asks if their PSU is big enough, I allways link to this- http://www.coolermaster.outervision.com/PSUEngine

To save you the legwork, I did it for you. around 700W is watt you need (geddit?) however, 850W is perfectly allright. bear in mind that this calculates at 100% load as well.
!