3 Ghz or Not

What would be some issues that one would see with not using a 3ghz cable with the hopper 3 ? My installer just used my 15 to 20 year old cable that was already in place and I am concerned about future problems
 
I've been using a coax that I installed in 1987 for my 722, to Hopper 1, to Hopper 3. All is good. Don't sweat it....
 

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