Both cards are supported, however they are very different beasts. 
Although the difference in the models is simply the letter "B" the 
chipsets are entirely different.  Many ethernet card manufacturers 
have pull this little trick, I guess it saves them some money since 
they don't need to make new boxes, literature, etc.  GNAT Box network 
card drivers are based on the chipsets rather than the card models. 
There are drivers that take certain variations into account, but 
generally it is based on the the values returned from the initial 
hardware probe at boot time.

The 3c905B is supported in 3.x, in fact this card is used in the 
GB-100 appliance box.

Paul

>
>Does anyone know if GNAT Box works with the 3Com 3C509B or just with the
>original 3C509? I don't see the B revision listed on the hardware
>compatibility list. There are a lot of these cards selling on eBay for
>pretty cheap, so I thought I'd pick up a few, but I wonder if I should stick
>with the original revision or if the 3C509B is OK too. (I'm going to assume
>no 3C509B unless someone knows otherwise.)
>
>Thanks!
>
>Mike
>
>

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