Hi Darneas,
Intel network adapter such as I340 and I350 supports IEEE 1588 (hardwawre time stamping), You may refer to product briefes below ,look for IEEE 1588 protocol under the ethernet feature
1) I340 server adapter http://www.intel.ph/content/dam/doc/product-brief/ethernet-i340-server-adapter-brief.pdf
2) I350 server adapter Intel® Ethernet Server Adapter I350: Product Brief
Hope these information helps.
rdgs,
wb