Will Radeon 6850 crossfire fit?

[spirituals]

I'm about to buy a new graphics card and wondering if 2x radeon 6850's will fit in my case/on my motherboard and if I need to upgrade my PSU.

MOTHERBOARD

http://www.msi.com/product/mb/870A-G54.html Should support crossfire, but not sure if it will fit because the card is pretty big.

CASE

http://www.madshrimps.be/articles/article/982/Maxcube-Amoris-6010-ATX-Case-Review#axzz1xUdJLgsX
It's pretty big so I think there will be no problem with the case.

PSU

Chieftec 500w
So I think I have to upgrade this one to at least 600/650, not sure.

 

[spirituals]

Good, fast and short answer, cheers.