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Could I ethernet a 917c to a 859ci HD?

Yes running the latest version and it does not perform any better at 1000 ft than it does 200ft.

Does this card perform at high speed on newer units??

I have a 917c and a 997SI and the performance is to put it nicely, LACKING. The detail is amazing is when it works. The map will go white just sitting on a spot and when Im moving it virtually works...