Had same issue with Optiplex 760. Below is a link to the download for the linux 2.6 driver for this nic.
Works like a champ.
Ubuntu 8.0.4 x64
http://downloadcenter.intel.com/confirm.aspx?httpDown=http://downloadmirror.intel.com/15817/eng/e1000e-0.5.18.3.tar.gz&agr=&ProductID=3003&DwnldId=15817&strOSs=&OSFullName=&lang=eng
Had same issue with Optiplex 760. Below is a link to the download for the linux 2.6 driver for this nic.
Works like a champ.
Ubuntu 8.0.4 x64
http:// downloadcenter. intel.com/ confirm. aspx?httpDown= http:// downloadmirror. intel.com/ 15817/eng/ e1000e- 0.5.18. 3.tar.gz& agr=&ProductID= 3003&DwnldId= 15817&strOSs= &OSFullName= &lang=eng