The Intel X710 just came out today; it's a little cheaper. (Note that
the X710 is 10G and the XL710 is 40G because XL is 40 in Roman numerals.)
http://www.colfaxdirect.com/store/pc/viewPrd.asp?idproduct=2227&idcategory=0
(I've never bought from Colfax, but they carry a lot of "enterprise"
equipment that isn't available on NewEgg/Amazon.)
There are super-cheap optics and twinax available from China. You may
have to hack the Intel driver since they're not "supported".
http://www.fiberstore.com/c/10g-sfp+_63
http://www.fiberstore.com/c/10g-sfp+-cables_1115
Or you could just get an account at the Snabb Lab.
--
Wes Felter
IBM Research - Austin
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