Which OS are you using? What is the make and model of the video cards? Have you tried re-installing the drivers for the graphics cards? When you say crash, do you mean only the program or the entire computer? Does your computer display an error message when it "crashes"? Have you looked in the event viewer under application to see if Windows has an error relating to the crash, if you are using a Windows operating system of coarse. Also, which actions are you referring to?

OK, I will put in question

Just FYI, I did update my original comment with more questions.

Yes, Windows says "Photoshop work stopped by error" (translation from russian)

No, system is Russian. Photoshop is English.

Hmm... a little vague... I would try re-installing the graphics card drivers. Also, which actions cause the program to crash? Sorry, I realized you meant that the system is Russian... Sorry for that last weird comment...

Re-installing the graphics card drivers doesn't help

Many, changing tool for example

Hmm... I thought this might be best in a chat

Let me know when you get here...

I am here

okay... Is this a custom build?

No

Who manufactured the computer?

Problm is not single

?

It's problem of every multi video cards comuter with photoshop

Adobe solution is stupid: remove 2nd videocard

Oh, you have googled this and found a lot of people experiencing this problem who are using multiple video card with CS6?

Wow...

That sounds horrible

I googled

I'm sorry, I am not a CS guru.

That's why I posted a question here

I hope someone finds your question and knows the answer

Good luck!

Oh, also, I would make a note of that article in the question

That would help people understand that you did your research and still cannot find a reasonable answer.

ok