OS: Windows 7 64 bit Home Premium
GPU: 2x HD7950 Radeon
CPU: i7 3930K
Ram: 16 GB

I would like to run the game on Ultra with 60 fps at 1920x1200 and everything maxed except certain features like Hairworks and cinematic depth of field (caused dialogues to be very laggy in Witcher 2)

If the GPU is not good enough I could OC them a bit (about 20-30% higher clocks?)

No one really knows yet. But since you said "everything maxed except certain features..." that implies yes. of course the devil is in what "certain features" you will have to turn off. In W2 it was ubersampling for me.

since u use crossfire i supose u will have to settle for under uber settings since the game is optimized for Nvidia which makes it tougher on amd single or cross to achive max but we will have to w8 for release to see what happens and u can than link us ur screenshots for comparison ofc
p.s. from what i read up a bit x-fire 7950 is weaker than a single 970 so i would say you wont be able to max it out sry about that