Upgrading graphics card, will GTX680 be good enough?

For your needs, an AMD card might be better suited for you. The GTX 680 can use 3 monitors for gaming. If you get an AMD GPU, you can have up to 6 monitors depending on your setup. An AMD GPU such as the HD 7970 is available in up to 6GB of VRAM vs the GTX 680's 4GB. The HD 7970 also has a bigger VRAM bus (384 bit vs 256 bit) which makes it ideal for multi-monitors.

The Nvidia tech is called "3D Vision Surrond" and the AMD tech is called 'Eyefinity". Crossfire is the term AMD uses for the tech that links two or more of their GPUs together. The Nvidia version is called SLI.

The card you link to is 2 GB, which is fine for one monitor. The HD 7970 comes standard with 3 GB.

http://www.geforce.com/hardware/technology/3dvision-surround/system-requirements

http://www.amd.com/US/PRODUCTS/TECHNOLOGIES/AMD-EYEFINITY-TECHNOLOGY/HARDWARE-SOFTWARE/Pages/hardware-software.aspx

Nvidia has onboard Physx which is used in games to create richer effects such as lighting, shadows, weather, etc. AMD cards support games that use Physx, but all the rendering is done through your CPU which puts more strain on it. It is possible to buy a low end Nvidia GPU and use it solely for Physx alongside the HD 7950, but it takes a little bit of work; not exactly plug n play. People also do that with a better Nvidia card and in that case it is plug n play. Nvidia's CUDA tech is ideal for gaming, but it is also ideal for applications such as video editing and rendering as well as 3D modeling. I have a GTX 660 SLI and I can tell you that the difference between Far Cry 3 on regular settings and Ultra makes it look like a different game. With the lighting and shadow effects, it looks like real life. It is hard to explain, but every thing looks real. The sun rays are individual rays of light and when it is reflected off the water or a glass windshield, it looks exactly like it would in real life.

The AMD 79xx series GPUs have, as mentioned, 384-bit DDR5 VRAM which comes in handy when you are using multiple GPUs in high resolutions. You will get higher frame rates and less "stutter" with a bigger RAM bus. The 7950 card you are looking at is also very well suited for overclocking. It should be possible to overclock the 7950 to match the performance of a stock 7970. And, of course, you are saving a bunch of cash. AMD is known more as a budget gamer's brand than Intel and Nvidia which are more of a professional's choices although they can play games just as well. Also, both the next Playstation and Xbox will be using an AMD GPU and CPU. This will make it easier for game publishers to port games over from consoles to PC. An an AMD GPU based PC will most likely better support these upcoming ports.

If you are just playing games, the AMD might be a better option. If you want dedicated Physx, the price between a single GTX 680 and a 7970 + a $100 (US) Nvidia GPU might explain the price difference. Also, the card you linked to is a 7950, which is a step below a 7970. A 7970 can be had in 3GB or 6GB.

About your monitors: the AMD supports different monitor types while the Nvidia requires that all the monitors be the same exact model. Another plus for AMD in your case.

If you want triple monitor gaming then I don't think any single GPU card short of a Titan will be enough, assuming you want maximum settings and no stuttering. I would say minimum of dual 670 4GB's/7950's for optimal performance in triple monitor gaming.

also, if you are streaming/recording/editing then it is advised that you have an i7 quad or hexa core, or possibly an AMD FX octo core. In some of my games my quad core i5 can get up to pretty high cpu usage, like 80-90% at certain times. So if I was trying to do something else like record then there could be issues.

I was wrong about Nvidia needing the same exact model monitors. It is a little confusing, but the best setup is to have monitors with the same resolution, refresh rate, aspect ratio and screen size. This doesn't mean they require all of those features which is what I thought. You can use those two monitors since they are both 1080p native, have the same refresh rate presumably (not listed) and are both 16:9 aspect ratio; even though they are different sizes. You should be fine, but it might look a little weird since I'm assuming everything on the bigger monitor will be bigger.

http://www.wsgf.org/book/export/html/1504

When the monitors have a different resolution, then all the monitors will only display the lowest common resolution. So, all of them need to be capable of the highest resolution of the monitor with the lowest highest resolution if that makes any sense. For example: 2x 1080p monitors and one that can only do 720p. In a 3 monitor setup on either AMD or Nvidia, all 3 will only be able to be 720p.

Yes, a GTX 680 is absolutely capable, but you might want to get the 4 GB one which is a bit more. Also, rumors about the soon to be announced GTX 780 indicate that it will have 5 GB VRAM. The reason I recommended the 7970 in the first place was that it is a 3 GB card standard and available in 6 GB which will enhance a mulit-monitor setup. If you can wait for the GTX 780, that might be even better for a multiple monitor setup.

That card was released in February 2013:

http://en.wikipedia.org/wiki/GeForce_600_Series#Geforce_GTX_Titan

and costs $1,000 US

http://www.newegg.com/Product/Product.aspx?Item=N82E16814121724

It uses the same GK110 chip found in the Titan supercomputer. Only the supercomputer has 18,000 plus of those chips.

This is also what the GTX 660ti, the GTX 670, the GTX 680 and the GTX 690 cards are based on. They all share the same exact chip, the GK104 which is based on the GK110 but with different parts disabled on it.

The two articles you linked to are from the first week of February 2013, right before the Titan was released. The GTX 780 will be a different card. According to wikipedia, they are coming out with new chips based on the Kepler: GK110, GK114, GK116 and GK117.

I'm guessing that the GK110 is going to be the top of the line card and might be called Titan again. Also, the 114 will be the GTX 790 down to the GTX 760ti. The GK116 will be the GTX 760, GTX 750ti and GTX 750 and the GK117 will round out the lower end cards.

http://en.wikipedia.org/wiki/GeForce_700_Series