Power to a gpu

[Walther621]

O.K I have a dell 8910 that I want to upgrade my GPU to a EVGA GTX 1080, card has two 8 pin connectors my power supply has one 6+2 and one 6 pin plug. What do I need to do to have it work?

 

[dotas1]

Prebuilds have the worst PSUs possible. You should buy another PSU of a good quality that can support your new GPU fully. Anything from Seasonic is highly recommended.
You can choose anything that is tier 2 or above from this list:
http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html