They're on the CD that came with your MB.
Sorry, looked around, couldn't find any drivers on the web. Maybe on Asus' site?
<A HREF="http://www.asus.com.tw/products/motherboard/driver.html" target="_new">Here</A>
and
<A HREF="http://www.via.com.tw/jsp/en/dr/driver.jsp" target="_new">here</A>
Make sure you install the right ones, though.
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Quarter pounder inside