Building it in doesn't really make sense. Nearly no users, power hungry (although that has gotten better), bulky. And what connector do you use? 10Gig Base-T? Not really common and power intensive. SFP+ port? Really bulky.
There are Thunderbolt adapters. USB3.0 only has 4Gbit/s available, ExpressCard only 2GBit/s, so both aren't really good options.
There are Thunderbolt adapters. USB3.0 only has 4Gbit/s available, ExpressCard only 2GBit/s, so both aren't really good options.