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Computer freezing/blue screening after enabling SLI

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February 25, 2013 7:33:54 AM

So I bought a second GTX 660 Ti a few weeks ago, and hooked everything up all fine, everything seemed to be running at least as well as it was before I added the second card. But I installed the base version of 3D Mark 11 a few hours ago, just to see how my system ranks as is right now. I'm planning on buying a bigger case with more ventilation, a Corsair water cooling loop, and a new PSU soon.

So anyway, I run the test, everything goes well. Until I notice the finished score wasn't quite what I was expecting.... My Mark 11 score was fairly low, then I noticed that it said I was only using one of the GPU's. "Ok then, guess Nvidia control panel decided to turn SLI off for some reason" I checked, sure enough SLI was disabled.

I enabled it and tried again, right after the first sequence both of my monitors went black then said they didn't have a signal. I thought that Mark 11 was just messing with the resolution so I waited a few minutes. Then I hear the "boot beep" (or whatever it's officially called) first once, then a couple more times. I felt I'd waited long enough and shut the system down. (task manager was not responding at this time either)

I tried turning SLI off again, half way through turning it off. Another crash.

SLI is now off, and the system is running like normal.


So, question is; Could this be the result of a insufficient power supply? or could there be something else going on here?
I've only built a few systems over the last few years, so I still feel like someone with more experience could think of something I'm not.


Here are my specs in case they help;
Intel Core i5 2500k (3.30GHz)
Corsair Vengeance 4GB x2 (8GB)
Asus P8Z68-V PRO/GEN 3
(2x) EVGA GTX 660Ti 2GB Superclocked (972Mhz)
Antec 25 Power supply (650watt)
Patriot Wildfire SSD (120GB)
Caviar Black hard disk drive (160GB)
Seagate Barracuda (1TB)
In Win Griffin Yellow Case
Two Asus 21" Monitors
Windows 7 HP



Thanks for any help :) 
February 25, 2013 4:37:33 PM

Sattooine said:
So I bought a second GTX 660 Ti a few weeks ago, and hooked everything up all fine, everything seemed to be running at least as well as it was before I added the second card. But I installed the base version of 3D Mark 11 a few hours ago, just to see how my system ranks as is right now. I'm planning on buying a bigger case with more ventilation, a Corsair water cooling loop, and a new PSU soon.

So anyway, I run the test, everything goes well. Until I notice the finished score wasn't quite what I was expecting.... My Mark 11 score was fairly low, then I noticed that it said I was only using one of the GPU's. "Ok then, guess Nvidia control panel decided to turn SLI off for some reason" I checked, sure enough SLI was disabled.

I enabled it and tried again, right after the first sequence both of my monitors went black then said they didn't have a signal. I thought that Mark 11 was just messing with the resolution so I waited a few minutes. Then I hear the "boot beep" (or whatever it's officially called) first once, then a couple more times. I felt I'd waited long enough and shut the system down. (task manager was not responding at this time either)

I tried turning SLI off again, half way through turning it off. Another crash.

SLI is now off, and the system is running like normal.


So, question is; Could this be the result of a insufficient power supply? or could there be something else going on here?
I've only built a few systems over the last few years, so I still feel like someone with more experience could think of something I'm not.


Here are my specs in case they help;
Intel Core i5 2500k (3.30GHz)
Corsair Vengeance 4GB x2 (8GB)
Asus P8Z68-V PRO/GEN 3
(2x) EVGA GTX 660Ti 2GB Superclocked (972Mhz)
Antec 25 Power supply (650watt)
Patriot Wildfire SSD (120GB)
Caviar Black hard disk drive (160GB)
Seagate Barracuda (1TB)
In Win Griffin Yellow Case
Two Asus 21" Monitors
Windows 7 HP



Thanks for any help :) 




if your PC is running fine without SLI then it sounds like a PSU shortage. Get a bigger PSU. at least 800 watts. make sure your graphics cards are in the right ports. some motherboards require the cards to be in a certain slot. check your manual. but a new PSU should fix it.
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February 25, 2013 4:47:59 PM

Sattooine said:
So I bought a second GTX 660 Ti a few weeks ago, and hooked everything up all fine, everything seemed to be running at least as well as it was before I added the second card. But I installed the base version of 3D Mark 11 a few hours ago, just to see how my system ranks as is right now. I'm planning on buying a bigger case with more ventilation, a Corsair water cooling loop, and a new PSU soon.

So anyway, I run the test, everything goes well. Until I notice the finished score wasn't quite what I was expecting.... My Mark 11 score was fairly low, then I noticed that it said I was only using one of the GPU's. "Ok then, guess Nvidia control panel decided to turn SLI off for some reason" I checked, sure enough SLI was disabled.

I enabled it and tried again, right after the first sequence both of my monitors went black then said they didn't have a signal. I thought that Mark 11 was just messing with the resolution so I waited a few minutes. Then I hear the "boot beep" (or whatever it's officially called) first once, then a couple more times. I felt I'd waited long enough and shut the system down. (task manager was not responding at this time either)

You do have the jumper board between the two video cards installed? If that is a dual rail power supply, you need to make sure that the draw is even (mol) between the rails.

I tried turning SLI off again, half way through turning it off. Another crash.

SLI is now off, and the system is running like normal.


So, question is; Could this be the result of a insufficient power supply? or could there be something else going on here?
I've only built a few systems over the last few years, so I still feel like someone with more experience could think of something I'm not.


Here are my specs in case they help;
Intel Core i5 2500k (3.30GHz)
Corsair Vengeance 4GB x2 (8GB)
Asus P8Z68-V PRO/GEN 3
(2x) EVGA GTX 660Ti 2GB Superclocked (972Mhz)
Antec 25 Power supply (650watt)
Patriot Wildfire SSD (120GB)
Caviar Black hard disk drive (160GB)
Seagate Barracuda (1TB)
In Win Griffin Yellow Case
Two Asus 21" Monitors
Windows 7 HP



Thanks for any help :) 

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0
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a c 1167 ) Power supply
February 25, 2013 9:18:32 PM

For a system using two GeForce GTX 660 Ti graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 650 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 38 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The Antec EarthWatts Green series (EA-650 Green) power supply, with its maximum combined +12 Volt continuous current rating of 54 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is more than electrically sufficient to power your system configuration with two GeForce GTX 660 Ti graphics cards in 2-way SLI mode but it is deficient by two PCI Express supplementary power connectors so you'll have to resort to using a couple of dual 4-pin Molex peripheral to 6-pin PCI-e adapter cables.

Have you checked the Windows Event Viewer's system log for Error events that may give you a clue as to what may be causing the problem?
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