thank you both. but does an old PCIe x16 reduce GPU performance. some say it does, i've seen fps tests that show the same. Is this comepletly up to a certain GPU?
i am now rethinking for a gtx970 as it goes for more than 100 less than a gtx 1060gb. you think it's worth it?
If you are doubtful about the performance of your cards when using the newer cards into your old board better to buy a cheap mother board I think around $50 to $80 you can buy a new motherboard and you can add more GPU if ever you wanted to increase more GPU.
Old mothersboard there are possibility that your board can be damaged if you run it for a long time in mining.