cjae - take this for what its worth.
From my personal experience, using an older laptop (approx. 400Mhz),
running linux, both 2.4.x & 2.6.x kernel, at the time I was using a
10base_T pcmcia NIC. I really don't think I could have been able to
tell the difference between that and a 10/100. The speed was fine.
If any glitches occured, they looked to be more of a video nature,
then due to transfer speeds.
It was a 3-com .... OK... after hitting my head on the desk for
2 minutes, I can't think of it. I'll post it tomorrow evening if
you still would like the exact model number.