Dell sells a vostro3670 psu that works for 1060. it is not a good idea to use the sata to 6 pin adapter and connect to a lower power 290W psu forV3670.  It is unsafe and may even soften/melt plastic of connector or be a fire hazard.  There is a reason that the Dell 290W psu for V3670 does not provide a 6 pin connector.  It is unable to supply the power of a discrete 160W video card such as GTX 1060.  Nvidia recommends minimal psu of 400W for this card.  To use this card you need to upgrade psu to the 365W one if available or a third party 400W psu.
I have this and I want to know where and how to connect this cable from amazon. Ultima Cords & Cables SATA 15 Pin to ATX 6 Pin PCI Express Graphics Video Card Power Cable Adapter [URL]   Where and how can I plug it in? [IMAGE]  
I have a GTX 1060 mini 6gb and want to use in Dell Vostro 3670