OK, the results are in! Here's how I tested: On my local server (connected with gigabit tp to my Asus RT-AC68U) I ran $ cat /dev/urandom | nc -l 1234 and on my X200 I ran $ nc server.ip 1234 > /dev/nullI then monitored the speeds with conky and estimated the average speed I was getting.
Here's what I got ar5b91 5.5-6 mb/s ar5b92 12.5-13 mb/s ar5b97 11.5-12 mb/s So now I'm using the ar5b92 card and it seems to be performing nicely :)
