The 690 is a very .. very old card already ..  and I didn't buy it for crypto mining but rendering.

My point is that it sux that my old card has after so much time till more cuda cores than any new you can buy.

And the Titan Z.. well ..who in the right mind will buy that one!?  I wonder if they every sell one such card for the price they dream. So forget about that one.
The 690 was in the price range of a normal card back then.