Currently I have a Quadro FX 580 graphic card, which does job well for visual projects and rendering. However, for this days computer games it would struggle a lot and I'm thinking about getting extra graphic card like GTX 560 Ti and connect them via KVM switch to single monitor.
My motherboard which is P7P55D series support multiple graphic cards but I'm not sure would they work together or not and what kind of conflicts I might dealing with?
They should work just fine. I think the limiting factor (and the reason I think this is a bad plan) is the use of a KVM. Most KVMs I'm aware of seriously hurt video bandwidth (make the image fuzzier / less sharp), which would be kind of a waste w/r/t the fancy video cards.
Sure, SLI would be nice, but if the two graphics cards have a distinct enough purpose / function, I see no issues with using both, one at a time. If your monitor accepts multiple inputs, I'd take advantage of that, rather than use the KVM.
Ok, I am running almost what you have suggested. I have a nVidia 560Ti and a Quadro 4600, obviously I can't run SLI, BUT, I set it up where my 560 is on PCIe 1 and the Quadro is on PCIe 2. Then I went into the nVidia control panel and put all my PhysX (3D rendering, etc.) on the Quadro. Works like a charm and my games are BEAUTIFUL. You DO NOT need a KVM, the others are right, it will make your screen blurry and it's an overall bad idea.
The technical answer is yes. The correct answer is no. KVMs are going to introduce video lag and fuzziness (digital KVMs are also pricey and have their own set of issues), and moving video cables around is going to be a pain. If you can hook up multiple inputs to your monitor that may be better, but you're then going to have to sort out your primary monitor any time you want to switch tasks from work to gaming.
You're better off buying a single card that will suit your needs. A Quadro is nothing more than a fancy consumer card, typically with special drivers and/or additional pipelines. I would investigate the Visual and Rendering software you're using and see what kind of performance you could expect to see out of a high end gaming card. For casual/personal use, you may be surprised, unless there is something that you're doing that specifically depends on the Quadro drivers or a particular feature of that card.
Yes, you can do this.
But why you would want to have multiple graphics cards connected to a single monitor via a KVM is beyond me, because you won't get any additional productivity.
What you're doing by this is effectively purchasing two cars, a fast car and a slow car. You can EITHER use the fast car, OR you can use the slow car, but you can't use them both at the same time to make one really fast car.
If you want to do this, you need to use SLI, which requires:
Seeing that a 560 ti is 5 Generations newer than a Quadro FX 580 (GeForce 9 series family) I would just upgrade to the 560 and dump the Quadro card, any optimizations to the BIOS / drivers on the Quadro 580 can be overcome by other advancements in the family.
Thought I like the idea of using it for PhysX as said below, you would still rely on the 560 for graphics...
It is possible but in practical terms only if the two video cards use the same video driver, that is, you cannot mix ATI/AMD video cards and Nvidia video cards in the same machine.
It sounds like you're really looking for a "Virtual Desktop" solution. These utilize APIs built into windows for creating multiple desktop spaces you can switch between. This will be a much more intuitive method for using one monitor for multiple workspaces on a single machine. It has been a while since I've used software like this, but it's very similar to the way Linux window managers provide multiple desktop spaces. Apparently the apps I used to use for this have faded out, but here are some I've found that might interest you:
EDIT Looks like there's a ton of them on CNET Downloads with good ratings and such.
