This is an old revision of the document!
http://www.supermicro.com/products/accessories/networking/SSE-X24S.cfm
http://www.supermicro.com/products/superblade/networking/
UIO Card: http://www.supermicro.com/products/accessories/addon/AOC-UTG-i2.cfm
PCIe x8 Card: http://www.supermicro.com/products/accessories/addon/AOC-EXPX9502FXSR.cfm