Could you please post a complete list of your system specs; including motherboard, CPU, power supply, memory, and operating system?  Please also include the driver version you're using for the 680's.

If you are using 2 Ways SLi Bridge so Put SLi on second slot between two GPU Cards! see arrow in picture below!!! 
Please Let us Know
 
EDIT> Notice We don't know what Full specs and don't know what model make gpu card do you have?

 

are they both the same size of video ram ie both 2gb or both 4gb?

Officially, video boards with different RAM sizes cannot be used in SLI:
https://forums.geforce.co...itle-says-most-of-it-/
 
Unofficially, it is possible. However this method will modify your Registry so create a Restore Point before you try it. Better yet, create a complete System Image.
http://www.eggxpert.com/forums/thread/838144.aspx

Zuhl3156

Officially, video boards with different RAM sizes cannot be used in SLI:


Unofficially, it is possible. However this method will modify your Registry so create a Restore Point before you try it. Better yet, create a complete System Image.

Dammit, i thought i read somewhere that it didn't matter.  Oh well, I'll try the coolbits thing, just need to make a restore point and all that.

I don't understand what is going on. Why is NVIDIA secretly changing things without announcing the changes? Two years ago it didn't matter if the cards had different amounts of VRAM. Two years ago the cards would even run at different speeds in SLI. Why did NVIDIA secretly stop using hybrid SLI?

If you look at the SLI requirements on NVIDIA's website, it is completely worthless because it doesn't tell you hardly anything. If you look at SLI FAQ on NVIDIA's website, it mentions the coolbits thing from 2006 for cards with different memory.

NVIDIA has become really bad with the drivers and documentation recently.

Having the Faster card in the secondary slot allows both cards to sync at the slower speed with no user input

NordicJedi

ty_ger07 
I don't understand what is going on. Why is NVIDIA secretly changing things without announcing the changes? Two years ago it didn't matter if the cards had different amounts of VRAM. Two years ago the cards would even run at different speeds in SLI. Why did NVIDIA secretly stop using hybrid SLI? 

If you look at the SLI requirements on NVIDIA's website, it is completely worthless because it doesn't tell you hardly anything. If you look at SLI FAQ on NVIDIA's website, it mentions the coolbits thing from 2006 for cards with different memory. 

NVIDIA has become really bad with the drivers and documentation recently. 

 
2 years ago it most definitely mattered if the cards had different Vram.  Simply because people could use 3rd party programs to hack around that limit doesn't make that Nvidia's fault if it's no longer supported, given that Nvidia didn't claim compatibility in the first place.  Coolbits hasn't worked in a long time, and the people updating Nhancer stopped doing so years ago, as well.  The FAQ you mentioned is a user-created FAQ, and that FAQ also notes you need the same memory size, as coolbits no longer works.  Nvidia reintroduced clock-matching with the 600 series, as previous generations can still operate out of sync.  Personally, I don't think that's a big deal, as you still took a bit of a performance hit being out of synch.

 
What do you mean the cards needed to have the same VRAM two years ago? HUH!?  No they didn't.  NVIDIA Hybrid SLI was a huge breakthrough and made a lot of people very happy.  It was designed mostly for low-performance situations where the onboard graphics card could help the dedicated graphics card and I agree that wasn't a very useful thing to most people, but it also introduced a ton of flexibility to the SLI system which benefited many.
 
The FAQ doesn't say anything about being 'user-created' and doesn't say anything about needing the same memory size.
http://www.geforce.com/hardware/technology/sli/faq
The FAQ looks very official to me and I assume it was written by someone at NVIDIA.  It does say NVIDIA at the bottom of the page after all.
 
All it says is that it is possible to SLI cards with different amounts of memory if you use Coolbits.   Surprisingly (or not so surprisingly after all since so much other information is wrong), it doesn't mention anything about Hybrid SLI.  It doesn't say that it is out of date and doesn't say that it no longer works.  Which FAQ are you looking at?  I am looking at the official NVIDIA SLI FAQ.

Can I mix and match graphics cards with different sizes of memory?
When purchasing a second graphics card, you should try to match the memory size so that you are ensured full value and performance from your purchase. However, while it is not recommended, NVIDIA does offer the flexibility to run graphics cards with different sized memory by using CoolBits. Using CoolBits (value set to 18), you can force both of the cards to use the lower of the two memory sizes and operate them together in SLI mode. When dissimilar memory sizes are enabled to work together using CoolBits, the effective memory size for each card becomes the smaller of the memory sizes.

http://www.geforce.com/hardware/technology/sli/faq#c19
I would say that if you follow this word and it doesn't work, NVIDIA owes you a refund.
 
Whether or not you thought Hybrid SLI was a valuable thing or whether or not we agree or disagree on the FAQ or anything else we agree with or disagree with, the point is that NVIDIA is doing a horrible job of informing its consumers.  That is why nobody can search and find a true answer to any of these questions without trying it themselves because everyone has a different answer based on some testing they did which may or may not work any more.
 
NVIDIA's drivers suck lately -- I think you can agree with that -- and this lack of providing consumers with valuable information or simply providing information which is blatantly wrong because the information has not been updated is a horrible sign of a company which has stopped caring.  They used to care and used to provide us with new cool features from time to time and provide us with documentation.  But now they keep removing documented features without any notification and don't update their documentation.  

sli hack will work but 2gb of the 4gb card will be rendered useless.

http://www.techpowerup.co...howthread.php?t=158907
give this a whirl and report back

Armydude77

Do you guys think i could contact EVGA, and explain what happened and see if i could get a different graphics card so that i can use the most up-to-date drivers and not have to do a hack or something to get SLI to work?

It wouldn't hurt to try. I think the best option would be to call them on the phone and explain the situation in detail. Depending on how long ago you purchased your video board and where you purchased it you may have the option to return it and exchange it for a compatible board. Most retailers and etailers like NewEgg and Tiger-Direct will work with you to resolve such issues.

2gb to 2gb or 4gb to 4gb vram has to be the same to sli like with all my 680 4gb for quad is the same good luck