Comment There are at least 3 boards that meet those reqs (Score 1) 120
The tyan s2895 (thunder k8we)
http://www.tyan.com/products/html/thunderk8we.html
(just preordered one myself),
The Iwill DK8EW and DK8ES
http://www.iwillusa.com/product_2.asp?p_id=91&sp=Y
However, the Athlon-FX does not have enough coherent HT links for multiple cpus, so you will have to use the opteron 2xx series. As for dual 16x vs dual 8x, there is no real world performance diff.
Also, there are number of other mobo makers with similar boards on the way based on the nvidia 2200, 2050, and amd 8131/8132 chips.
http://www.tyan.com/products/html/thunderk8we.htm
(just preordered one myself),
The Iwill DK8EW and DK8ES
http://www.iwillusa.com/product_2.asp?p_id=91&sp=
However, the Athlon-FX does not have enough coherent HT links for multiple cpus, so you will have to use the opteron 2xx series. As for dual 16x vs dual 8x, there is no real world performance diff.
Also, there are number of other mobo makers with similar boards on the way based on the nvidia 2200, 2050, and amd 8131/8132 chips.