Gigabit on a dinosaur?

[Jim]

Today I bought a couple of Trendnet TEG-PCITXR gigabit ethernet cards. 
I put one in my windows box and one in my linux box.  The linux box is a 
dinosaur.  It's a P166 running slackware 10.2 2.4.31 kernel.  DMESG 
shows the card is correctly identified and shows the following:

eth1: Auto-negotiation Enabled.
eth1: 1000Mbps Full-duplex operation.

I watched iptraf as I copied a file from the windows box to the server. 
  Iptraf was showing the incoming rate on eth1 at around 28000 kbits/sec.

Should I be getting better speeds than this or is this all I can expect 
from my dinosaur.

Thanks

Jim in Phoenix