4850 xfire, but motherboard has crossfire support - Bridge Needed?

[OneHumongousLoser]

I have this card (HIS 4850):
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161275
http://www.hisdigital.com/us/product2-431.shtml

and have this mobo (GA-EP45-UD3P):
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128358
http://www.gigabyte-usa.com/Products/Motherboard/Products_Overview.aspx?ProductID=3013

Somewhere I read that the 4000 series do not need the bridge with a mobo that supports xfire. I am going to get this card (another HIS 4850):
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161296

So, would i need the bridge or not? If so, they bundle a bridge with the iceQ model, and I would just order that one (about same price with shipping).

Also, using a Q9550, would all this with a 600W power supply be ok?
If the power supply is 80+ certified (dont know if that makes a difference).

Answers greatly appreceiated.
Thanks

 

[fjc1998]

You do need a bridge and this link might help with the psu problem http://www.antec.outervision.com/

 

[OneHumongousLoser]

thanks fjc