Ethernet latency with newer PCI bus NICs

[Lechner, David]

I remember that it was suggested a while back (by Greg Lindahl I think!)
that newer PCI-X bus based NICs would be soon available which significantly
reduce the latency involved with Fast Ethernet NICs  - Are these available
now, and does anyone have NetPipe/Perf or other comparative results on the
latency changes using the newer bus ?  
Thanks in advance - 
Dave Lechner