I think this question isn't best suited for these forums as it leans more towards being a discussion of cryptocurrency and for the most part will generate opinions.
To answer your question, I do not believe so, at least not in the case of the GTX 690. I've read in many places that cards with 2GB of VRAM causes problems for mining. While the 690 is 4GB, it is actually 2GB of VRAM per GPU, and I remember reading somewhere that the 690 was causing issues because of this. Another thing to note is that the 690 has a pretty high faliure rate most likely due to the excessive heat generated inside of the card. I had one and even after replacing the thermal paste and pads with high quality replacements the card's temps were not much improved...