Download gpuz and verify, without precision running, that it is indeed overclocking the cards and that it wasn't gpu boost doing it.

Also, do you find it strange that a game about hacking and making things do what you want, is doing this to your equipment...

I haven't downloaded the game. I refused to buy it after the bf4 release issue and forgot about it until about a week after release, when every freaked because of how bad it performs. Now I just don't feel the need to play it yet.

How do you like it?

Software does not read voltages correct, unfortunately. It hasn't been able to properly display for a while, but it may be tied to it. I have never heard of this before, unless it is simply demanding too much from the card, so the card is trying to overcompensate. What settings are you running at and what kind of fps are you getting?

First, I tried to use the autodetect in-game for 1080p. It set everything to medium. Force closes all over the place.
Then, I tried GeForce Experience. It set everything to high/ultra, and of course the game crashes within 30 seconds.
So, I set all the settings to the absolute minimum, disabled anti-aliasing completely, and ran the game at 720p. Still crashes like crazy!
 
BTW, the computer can run Unigine Heaven & Valley on High settings for hours just fine. Stress tested with FurMark too, had to point some extra fans at my cards to prevent overheating, but again, no issues other than heat.
 

OK, DDU compete uninstall done, in Safe Mode too, it was really easy and fast, less than 3 min altogether. Reinstalled 340.52 custom, only driver & PhysX. Smooth, no errors. Testing with Watch Dogs on medium settings, and just GPU-Z running on second monitor. Will update results tomorrow. Good night!

-A30N-
I bought 2x EVGA GTX 660 3GB Superclocked+ for my budget gaming build. All games seem to run fine on high/ultra settings, except Watch Dogs. It crashes completely randomly. Sometimes I can make it an hour or two without crashing, sometimes it crashes back-to-back. After a bunch of troubleshooting, I loaded up EVGA PrecisionX 15 and discovered that Watch Dogs is overclocking my card! I've never seen anything quite like it. Here are my specs:
 
EVGA Z97 FTW Motherboard
EVGA 750W SuperNova Power Supply
EVGA GTX 660 3GB Superclocked+ (2x)
Intel 4670K Processor
16GB ADATA XPG DDR3-1600 RAM
256GB ADATA XPG SSD (2x RAID0)
Windows 8.1 Pro, updated, nVidia Driver 340.52 WHQL
 
The cards are rated for 1046MHz Base Clock, 1111MHz Boost Clock, and the default voltage is 925mV.
When playing Watch Dogs, PrecisionX 15 & GPU-Z both report the GPU clock running steady at 1162MHz, and the voltage is 1175mV!
The overclocking begins as soon as the game begins, persists throughout the loading & setting menus and into the gameplay itself.
 
Troubleshooting steps taken: Re-installed a clean copy of Windows, tried 4 different nVidia drivers, tested with no other software installed or running in the background.
 
What would be the best way to lock my clock & voltage to prevent Watch Dogs from overclocking and damaging my new cards?

The game isn't OC'ing your cards.  The advertised base & boost clocks are just that.  They are the minimum clock speeds you'll see other than the idle clock.  But most if not all Kepler cards will boost higher than the advertised boost speed.  The only difference is how much.  It's completely normal as long as there isn't an issue with the cards themselves.
 
The default voltage you mention (925mV) is the idle voltage.  1175mV is the full load voltage.  As long as you didn't use PrecX to OC your cards and they're running at defaults, what you're seeing is totally normal.
 
Things I'd try:
1.  Run one of your benchmarks with very high settings like performance or extreme settings.  While doing so, monitor your core clocks with PX to see what clock speeds you boost up to.
 
2.  Try running Watch dogs with SLI disabled.  I don't know if they fixed it yet, but I thought there was an SLI issue with this game.  But worth testing it out.
 
3.  Uninstall the game and re-install it.  I say this because you mentioned you tried letting Geforce experience set your settings for you.  Once you do that, it changes your config files for the game.  I suggest uninstalling the game, then reinstall it and set your own game settings.  Don't let GFE mess up your game config.
 
Notes:  While doing any monitoring of your GPU vitals, use only PX or AB or GPU-Z, but not any of them at the same time as they poll a lot of the same sensors  and can cause issues.
Watch your GPU temps as well just to verify they're not getting out of hand.
 
Let us know how everything works out...

Sounds good...  Keep us posted.

Been doing that ever since Nvidia added the custom install feuture, I ALWAYS unclick 3D, HDMI, Geforce Experience and just install the Driver and PhysX. Then I click on Fresh Install checkbox, never had a problem doing this.

-A30N-
Alright, the results are in!
 
I can play as long as SLI is disabled. No crashing or weird overclocking! But I didn't spend $380 on graphics cards to play a game on medium settings. Anyway, I downloaded and installed TheWorse Mod, and it adds a ton of eye candy, without sending my card's temps into the red! So for now, I'm happy. I will have to remember to set my cards back to SLI for all other games though.
 
Oh, and I just got my 21:9 2560x1080 monitor today...WOW! Super widescreen is amazing! 
 

 
Thanks again for all your help and suggestions!

Glad to hear everything is working now even though without SLI for that game...
 
Nice monitor btw...