Now such prices for all cards as 1060 is dangerous to take and even 6g, but who buys 3g is generally a mystery to me .. Why? I have all farms for 1060-6g, they have paid for themselves for a long time and are mined for profit, but I do not buy new carts, because it's dangerous to do it in an apartment, everything will be fucked up
There is no magic in that basically the people prefer 1063 video cards. They are cheaper, and the speed of their mining is the same (no cents count). Accordingly, according to the calculation of the price-quality 1063 best, unless, of course, if you going to mine etherium, where later you will need a large amount of memory. Actually for mining this is the only advantage of video cards 1066 against 1063.
In my opinion, the bigger drawback of the 1063 is the higher probability that you will get hynix memory in the cards. I've never found hynix in my 1066's yet.