They are just off loading dies, come the end of the year all these cards 77,78,79+GRE will drop heavily in price going by the fact the 8800XT is going to trounce them.
Even the XTX at this stage is something I'm avoiding, I'm going to wait a while and see what the rumours are about the 9k series before deciding, in terms of time frame.
As solid as my 6800XT is my next card i want to last just as long, especially since FSR3 and frame gen is proving to be very useful to me.