TRENDnet 64 bit Network adapter

Most network cards seem to be 32-bit. is there an advantage to this one that has 32 and 64 bit capabilities? It also says supports full duplex mode which doubles bandwidth to 20/200/2000Mbps. I am pretty sure this just means more data through but not faster? Just curious because the are touting this as good for gaming but not sure if that really speads things up or just allows more data? I apologize if a dumb question. Don't know a lot about this stuff and am starting to get into it. Looking to get my first good computer and this is an option on many of the customize sites. So is the Killer Card but it looks like a big waste of money and this card isn't really that expensive.