After long deliberation I went ahead and bought new PC. The purpose is run 4 monitors with two grahics card, however so far I've no luck. I udpated the drivers, searched on Google and searched here.
Here is my configuration:
Intel i7 – 950
2 x Gigabyte HD 5570
Win 7 64 Bit
The two card are connected via bridge and under "Catalyst Contol Center" CrossFirex is enabled.
Right now only 2 monitor works and they both conneted to same graphics card. If I swap the cables then other 2 monitor works, which tell me that one card is not working at all. However both cards are detected under Device manager.
Any help is highly appreciated.