Need Help With Mother Board!

[SKiLLs]

Ok i got http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3445214920&category=1244&rd=1

only thing is i found out i only had a 900 Mhz TBird... Anyone know a way to get the 900 Mhz to work on this? The dude said something on it and i never got it. I am not dumb when it comes to computers but this is the first time buying a Mother Board.  If chould tell me how i chould get my Mother Board to work with my TBird 900 Mhz it would help me ALOT. THANKS!

[Hitmen]

Underclock it?