The 1066mhz is the front side bus seen on the Asus model at the link here.
http://www.newegg.com/Product/Produc...82E16813131030 This one runs the DDR800 memory and supports the Core 2 Extreme Duo. You will have to pay slightly more for this model however. Apparently newegg is out of stock on the SLI model boards. I'll re edit here if another good vendor has one.
EDIT:
http://www.newegg.com/Product/Produc...131031&Local=y It will cost about twice as much.